1      Introduction and Background........................................................................................................................ 1

1.1        The Laser Lethality Data Collection Process............................................................................... 1

1.2        Laser Lethality Test Planning.................................................................................................................. 2

2      Purpose / Scope............................................................................................................................................................. 5

3      Data Collection Standards............................................................................................................................... 7

3.1        Measured Characteristic:  Laser Beam Power and Pulse Format.................................... 7

3.1.1     Purpose of the Measurement.............................................................................................................................. 7

3.1.2     Technical Approaches to the Measurement.................................................................................................... 7

3.1.3     Calibration of Measurement Hardware......................................................................................................... 18

3.1.4     Data Acquisition and Logging........................................................................................................................ 19

3.1.5     Data Reduction................................................................................................................................................... 21

3.1.6     Uncertainty of Measurement Results.............................................................................................................. 22

3.1.7     Output to Database............................................................................................................................................ 23

3.2        Measured Characteristic:  Laser Beam Spatial Profile........................................................ 25

3.2.1     Purpose of the Measurement............................................................................................................................ 25

3.2.2     Technical Approaches to the Measurement.................................................................................................. 25

3.2.3     Calibration of Measurement Hardware......................................................................................................... 36

3.2.4     Data Acquisition and Logging........................................................................................................................ 37

3.2.5     Data Reduction................................................................................................................................................... 39

3.2.6     Uncertainty of Measurement Results.............................................................................................................. 40

3.2.7     Output to Database............................................................................................................................................ 41

3.3        Measured Characteristic:  Wavelength.......................................................................................... 43

3.3.1     Purpose of the Measurement............................................................................................................................ 43

3.3.2     Technical Approaches to the Measurement.................................................................................................. 43

3.3.3     Calibration of Measurement Hardware......................................................................................................... 44

3.3.4     Data Acquisition and Logging........................................................................................................................ 45

3.3.5     Data Reduction................................................................................................................................................... 45

3.3.6     Uncertainty of Measurement Results.............................................................................................................. 45

3.3.7     Output to Database............................................................................................................................................ 46

3.4        Measured Characteristic:  Target Absorptance (Optical Approach).......................... 47

3.4.1     Purpose of the Measurement............................................................................................................................ 47

3.4.2     Technical Approaches to the Measurement:................................................................................................. 47

3.4.3     Calibration of Measurement Hardware......................................................................................................... 48

3.4.4     Data Acquisition and Logging........................................................................................................................ 49

3.4.5     Data Reduction................................................................................................................................................... 49

3.4.6     Uncertainty of Measurement Results.............................................................................................................. 49

3.4.7     Output to Database............................................................................................................................................ 50

3.5        Measured Characteristic:  Target Absorptance (Thermal Approach)....................... 51

3.5.1     Purpose of the Measurement............................................................................................................................ 51

3.5.2     Technical Approaches to the Measurement:................................................................................................. 51

3.5.3     Calibration of Measurement Hardware......................................................................................................... 54

3.5.4     Data Acquisition and Logging........................................................................................................................ 54

3.5.5     Data Reduction................................................................................................................................................... 54

3.5.6     Uncertainty of Measurement Results.............................................................................................................. 55

3.5.7     Output to Database............................................................................................................................................ 55

3.6        Measured Characteristic: Thermal Coupling Coefficient................................................... 57

3.6.1     Purpose of the Measurement............................................................................................................................ 57

3.6.2     Technical Approaches to the Measurement.................................................................................................. 57

3.6.3     Calibration of Measurement Hardware......................................................................................................... 59

3.6.4     Data Acquisition and Logging........................................................................................................................ 60

3.6.5     Data Reduction................................................................................................................................................... 61

3.6.6     Uncertainty of Measurement Results.............................................................................................................. 62

3.6.7     Output to Database............................................................................................................................................ 63

3.7        Measured Characteristic: Penetration Time............................................................................... 64

3.7.1     Purpose of the Measurement............................................................................................................................ 64

3.7.2     Technical Approaches to the Measurement.................................................................................................. 64

3.7.3     Calibration of Measurement Hardware......................................................................................................... 69

3.7.4     Uncertainty of Measurement Results.............................................................................................................. 70

3.7.5     Output to Database............................................................................................................................................ 70

3.8        Measured Characteristic:  Impulse..................................................................................................... 71

3.8.1     Purpose of the Measurement............................................................................................................................ 71

3.8.2     Technical Approaches to the Measurement.................................................................................................. 71

3.8.3     Calibration of Measurement Hardware......................................................................................................... 71

3.8.4     Data Acquisition and Logging........................................................................................................................ 72

3.8.5     Data Reduction................................................................................................................................................... 72

3.8.6     Uncertainty of Measurement Results.............................................................................................................. 72

3.8.7     Output to Database............................................................................................................................................ 73

3.9        Measured Characteristic: Plasma/Plume Absorption / Scattering of

                  the Laser Beam................................................................................................................................................ 74

3.9.1     Purpose of the Measurement............................................................................................................................ 74

3.9.2     Technical Approach to the Measurement...................................................................................................... 74

3.9.3     Calibration of Measurement Hardware......................................................................................................... 77

3.9.4     Data Acquisition and Logging........................................................................................................................ 77

3.9.5     Data Reduction................................................................................................................................................... 77

3.9.6     Uncertainty of Measurement Results.............................................................................................................. 77

3.9.7     Output to Database............................................................................................................................................ 78

3.10       Measured Characteristic:  Plasma Formation........................................................................... 79

3.10.1        Purpose of the Measurement....................................................................................................................... 79

3.10.2        Technical Approach to the Measurement................................................................................................ 79

3.10.3        Calibrations Required................................................................................................................................. 80

3.10.4        Data Acquisition and Logging................................................................................................................... 81

3.10.5        Data Reduction............................................................................................................................................. 81

3.10.6        Uncertainty of Measurement Results......................................................................................................... 81

3.10.7        Output to Database...................................................................................................................................... 82

3.11       Measured Characteristic:  Ambient Pressure and Optical Contamination............ 83

3.11.1        Purpose of the Measurement....................................................................................................................... 83

3.11.2        Technical Approaches to the Measurement............................................................................................. 83

3.11.3        Calibration of Measurement Hardware................................................................................................... 85

3.11.4        Data Acquisition and Logging................................................................................................................... 85

3.11.5        Data Reduction............................................................................................................................................. 85

3.11.6        Uncertainty of Measurement Results......................................................................................................... 85

3.11.7        Output to Database...................................................................................................................................... 86

3.12       Measured Characteristic: Air Flow Simulation........................................................................ 87

3.12.1        Purpose of the Measurement....................................................................................................................... 87

3.12.2        Technical Approaches to the Measurement:........................................................................................... 87

3.12.3        Calibration of Measurement Hardware................................................................................................... 89

3.12.4        Uncertainty of Measurement Results......................................................................................................... 90

3.12.5        Output to Database...................................................................................................................................... 90

3.13       Measured/Reported Characteristics: EO Sensor Target Description

                 and Performance........................................................................................................................................... 92

3.13.1        Purpose of Description................................................................................................................................ 92

3.13.2        Examples of Sensor Description and Characterization........................................................................ 94

3.13.3        Post-Test Measurements and Uncertainty................................................................................................ 98

3.14       Measured/Reported Characteristics: Target and Material Description............... 100

3.14.1        Purpose of Specimen Description............................................................................................................ 100

3.14.2        Examples of Material Description and Characterization.................................................................. 101

3.14.3        Measurements and Accuracy.................................................................................................................... 102

3.14.4        Organization by Materials Family.......................................................................................................... 103

3.14.5        Pre-Test Material/Target Description.................................................................................................... 103

3.14.6        Post Test Material Damage Assessment................................................................................................. 106

4      Reporting Uncertainty of Measurements............................................................................................. 108

4.1        Definitions.......................................................................................................................................................... 108

4.2        Evaluation of Uncertainty Contributions................................................................................. 110

4.3        Calorimeter Calibration Example.................................................................................................... 113

5      References................................................................................................................................................................... 115

6      ABBREVIATIONS AND ACRONYMS....................................................................................................................... 117

7      Appendix A: Use of Uncoated Fused Silica Wedges for Beam
          Diagnostics................................................................................................................................................................. 120

Addendum: Test Report Standard     

1      INTRODUCTION AND BACKGROUND....................................................................................................................... 1

2      PURPOSE/SCOPE.............................................................................................................................................................. 1

3      TEST REPORT STANDARD............................................................................................................................................ 2

3.1        Front Material.................................................................................................................................................. 2

3.2        Introduction and Background (portions extracted from test plan)................................. 3

3.3        Test Objectives (portions extracted from test plan)...................................................................... 3

3.4        Test Approach (portions extracted from test plan)....................................................................... 3

3.5        Pretest Predictions (portions extracted from test plan)............................................................ 3

3.6        Test Description (portions extracted from test plan)................................................................... 4

3.6.1        Test Setup Description .................................................................................................................................... 4

3.6.2        Laser Description ............................................................................................................................................. 4

3.6.3        Test Article Description and Sample Identification .................................................................................. 5

3.6.4        Target Environment Description .................................................................................................................. 6

3.6.5        Beam Diagnostics Description ...................................................................................................................... 6

3.6.6        Target Diagnostics Description .................................................................................................................... 7

3.6.7        Data Acquisition System Description .......................................................................................................... 9

3.7        Test Matrix........................................................................................................................................................... 9

3.8        Summary of Test Results and Interpretation of Data........................................................... 9

3.8.1        Overview of Test Results.................................................................................................................................. 9

3.8.2        Detailed Discussion of Test Results............................................................................................................ 10

3.8.3        Relationship of Test Results to Test Observables..................................................................................... 10

3.9        Summary of Data Uncertainty Estimates..................................................................................... 10

3.9.1        Evaluation of Uncertainty Contributions.................................................................................................. 12

3.9.2        Calorimeter Calibration Example............................................................................................................... 13

3.10        Conclusions........................................................................................................................................................ 14

3.11        Recommendations.......................................................................................................................................... 15

3.12        References............................................................................................................................................................ 15

3.13        Appendix A. Spreadsheet of Test Conditions and Tabular Data Results.................. 15

3.14        Appendix B. Reduced Temporal Data Charts................................................................................. 16

3.15        Appendix C. Definition of Mathematical Symbols..................................................................... 16

3.16        Appendix D. Glossary of Terms................................................................................................................ 16

4      GENERAL GUIDANCE........................................................................................................................................................ 17

5      ARCHIVING OF TEST DATA............................................................................................................................................ 17

6      REFERENCES........................................................................................................................................................................ 17

7      APPENDIX A. LIST OF SYMBOLS AND DEFINITIONS............................................................................................ 18