ISUAL Test Plans and Procedures

Transcription

1 UCB Dwg. No: 8823-W7 Rev: A ISUAL Test Plans and Procedures Prepared by: H. Heetderks Approved by: S. Mende Revision History Rev Description By Date A Initial version containing summary material from dwg 8820 HDH 12 July, 2001 i

2 Table of Contents 1.0 INTRODUCTION ISUAL Test Plans Electrical Functional Test Science Performance Tests Imager Tests Imager Tests with Collimator (Test A1) Imager Tests with Monochrometer (Test A2) Imager Flat Field Test (Test A3) Spectrophotometer Tests Spectrophotometer Tests with Collimator (Test B1) Spectrophotometer Tests with Monochrometer (Test B2) Array Photometer Tests Array Photometer Tests with Collimator (Test C1) Array Photometer Tests with Monochrometer (Test C2) Additional Science Performance Tests Imager Bright Flash Tolerance Test (Test D1) Spectrophotometer Bright Flash Tolerance Test (Test D2) Spectrophotometer Tests with uv Monochrometer (Test D3) 11 ii

3 ACRONYMS AP Array Photometer CCD Couple Charged Device CDR Critical Design Review CTF Charge Transfer Function AEP Associated Electronics Package DPU Data Processing Unit EEPROM Electrically Erasable Programmable Read Only Memory EMC Electro-Magnetic Compatibility EMI Electro-Magnetic ETU Engineering Test Unit (Prototype) FOV Field of View IDC Instrument Data Controller IFOV Instantaneous Field of View ISUAL Imager of Sprites for the Upper Atmosphere Lightning MM Mass Memory MTF Modulation Transfer Function NCKU National Cheng-Kung University NSPO National Space Programs Office PDR Preliminary Design Review SNR Signal to Noise Ratio SOH Status Of Health SSL Space Sciences Laboratory SSR Solid State Recorder TBD To Be Determined TBS To Be Specified TC Thermal Cycling TV Thermal Vacuum UCB University of California at Berkeley UV Ultra-Violet

4 ISUAL Test Plans and Procedures 1.0 Introduction The following sections provide a test plan and a procedure for each of the tests which will be run on the ISUAL instrument prior to delivery to the NSPO. 2.0 ISUAL Test Plans 2.1 Electrical Functional Test This test is intended to verify the correct operation of the ISUAL electronics and software. The test starts with the first assembly of the ETU power system with the ETU DPU, and is first used to identify bugs in the power system and the DPU. As additional ETU boards are developed and added to the ETU system, the test procedure is expanded to include their functions. Thus the test procedure is developed in parallel with the instrument hardware. Over the course of the development period the test will expand to include all sensor assemblies and all instrument functions and will finally culminate in a Long Functional test which will be used to verify operation of the completed flight instrument. The test will verify the proper response to all commands, the proper instrument operation in all modes, and the proper generation of all telemetry products. The test will make use of the built in stimulation sources in the Imager, the Spectrophotometer, and the Array Photometer, and may include a limited amount of external stimulation in the final version. Following the development of the final Long Functional Test, an abbreviated version will be made which will be used to verify instrument operation during EMC and thermal vacuum testing, and following vibration testing. 2.2 Science Performance Tests This section gives a description of the nine test set-ups which will be used to verify that the sensor assemblies meet requirements on resolution, signal to noise, speed, etc. These tests will typically be done informally on the ETU sensor sub-assemblies to develop the test procedure and to get an early indication of any potential problems with the ISUAL design. They will then be done formally on the completed flight unit in the final phases of the test program to completely characterize the instrument. The final calibration will consist of a final re-running of a selected subset of these tests Imager Tests 1

5 Imager Tests with Collimator (Test A1) Filter Test Pattern Pinhole ISUAL imager Collimator Shutter An incandescent lamp is used to provide a wide band source of light. One of a number of filters is used to select a particular wave length band. A pin hole or target pattern is used depending on which test is to be run. A collimator provides an image focused at infinity and expands the beam to fill the instrument aperture. The Imager is mounted on a rotary table with two degrees of freedom to allow the test to be done over all angles. Three basic tests are done with this set-up: 1) The Focused Spot Test 2) The Resolution Target Test 3) Shutter Tests These test will result in measurement of the point spread function, the MTF, and the exposure duration. 2

6 Imager Tests with Monochrometer (Test A2) Test Pattern Pinhole ISUAL imager Monochromater Quartz diffuser Standard PM tube. An incandescent lamp is used to provide a wide band source of light. The monochrometer is used to provide a very narrow wavelength band of input light. A quartz diffuser provides a uniformly diverging beam. A standard PM tube may be transferred into or out of the beam to provide an absolute intensity calibration. The Imager is mounted on a rotary table with two degrees of freedom to allow the test to be done over all angles. Three basic tests are done with this set-up: 1) The wavelength response for each filter 2) Relative sensitivity over the field. 3) Responsivity comparison with a standard PMT These test will result in measurement of the wavelength response, any large scale non-uniformity, and the absolute sensitivity. 3

7 Imager Flat Field Test (Test A3) ISUAL imager Filter Lens-Removed An incandescent lamp is used to provide a wide band source of light. One of a number of filters is used to select a particular wave length band. A pin hole is used to limit light falling on the detector to a uniform beam. The lens is removed from the instrument so that the CCD is illuminated directly. This test allows any non-uniformity of the detector to be identified. 4

8 2.2.2 Spectrophotometer Tests Spectrophotometer Tests with Collimator (Test B1) ISUAL Spectrophotometer Filter Pinhole Collimator Shutter An incandescent lamp is used to provide a wide band source of light. One of a number of filters is used to select a particular wave length band. A pin hole or target pattern is used depending on which test is to be run. A collimator provides an image focused at infinity and expands the beam to fill the instrument aperture. The Spectrophotometer is mounted on a rotary table with two degrees of freedom to allow the test to be done over all angles. Two basic tests are done with this set-up: 1) The Focused Spot Test 2) Shutter Tests These test will result in measurement of the Field of View of the Photometers, and the time response. 5

9 Spectrophotometer Tests with Monochrometer (Test B2) ISUAL Spectrophotometer Test Pattern Pinhole Monochromater Quartz diffuser Standard PM tube. An incandescent lamp is used to provide a wide band source of light. The monochrometer is used to provide a very narrow wavelength band of input light. A quartz diffuser provides a uniformly diverging beam. A standard PM tube may be transferred into or out of the beam to provide an absolute intensity calibration. The Spectrophotometer is mounted on a rotary table with two degrees of freedom to allow the test to be done over all angles. Two basic tests are done with this set-up: 1) The wavelength response for each filter 2) Responsivity comparison with a standard PMT These test will result in measurement of the wavelength response, and the absolute sensitivity. 6

10 2.2.3 Array Photometer Tests Array Photometer Tests with Collimator (Test C1) ISUAL Array Photometer Filter Pinhole La m p Collima tor Shutter An incandescent lamp is used to provide a wide band source of light. One of a number of filters is used to select a particular wave length band. A pin hole or target pattern is used depending on which test is to be run. A collimator provides an image focused at infinity and expands the beam to fill the instrument aperture. The Array Photometer is mounted on a rotary table with two degrees of freedom to allow the test to be done over all angles. Two basic tests are done with this set-up: 1) The Focused Spot Test 2) Shutter Tests These test will result in measurement of the Field of View of the Array Photometer, and the time response. 7

11 Array Photometer Tests with Monochrometer (Test C2) Test Pattern Pinhole ISUAL Array Photometer Monochrometer La m p Quartz diffuser Standard PM An incandescent lamp is used to provide a wide band source of light. The monochrometer is used to provide a narrow wavelength band of input light. A quartz diffuser provides a uniformly diverging beam. A standard PM tube may be transferred into or out of the beam to provide an absolute intensity calibration. The Array Photometer is mounted on a rotary table with two degrees of freedom to allow the test to be done over all angles. Two basic tests are done with this set-up: 1) The wavelength response for each filter 2) Responsivity comparison with a standard PMT These test will result in measurement of the wavelength response, and the absolute sensitivity. 8

12 2.2.4 Additional Science Performance Tests This section describes additional tests which will be done to verify science performance parameters which are not addressed in the requirements specifications contractually placed on the ISUAL instrument development Imager Bright Flash Tolerance Test (Test D1) Pulsed ISUAL imager Filter d Diffuser Shutter An incandescent lamp, a filter, and a diffuser are used to simulate a sprite. A shutter allows the light to be gated on and off to vary the arrival time of the simulated sprite. A pulsed lamp of adjustable intensity is set up to be a distance d away from the simulated sprite. The Imager is mounted on a rotary table with two degrees of freedom to allow the test to be done over different parts of the intensifier in the Imager. The test consists in flashing the lamp and then determining how soon after the flash a sprite can be detected and how this varies with the angular separation between the light flash and the sprite. This test will result in a characterization of the Imager bright lightning flash tolerance near a sprite, and the time response of the Imager after and during the flash. 9

13 Spectrophotometer Bright Flash Tolerance Test (Test D2) Pulsed ISUAL Spectrophotometer Filter d Diffuser Shutter An incandescent lamp, a filter, and a diffuser are used to simulate a sprite. A shutter allows the light to be gated on and off to vary the arrival time of the simulated sprite. A pulsed lamp of adjustable intensity is set up to be a distance d away from the simulated sprite. The Imager is mounted on a rotary table with two degrees of freedom to allow the test to be done over different parts of the intensifier in the Imager. The test consists in flashing the lamp and then determining how soon after the flash a sprite can be detected and how this varies with the angular separation between the light flash and the sprite. This test will result in a characterization of the Spectrophotometer bright lightning flash tolerance near a sprite, and the time response of the Spectrophotometer after and during the flash. 10

14 Spectrophotometer Tests with uv Monochrometer (Test D3) Vacuum chamber Aperture ISUAL Spectrophotometer Vacum Monochromater Deuterium Quartz diffuser Calibrated UV detector. Vacuum chamber A deuterium lamp with a vacuum monochrometer is set up adjacent to the vacuum chamber. The Spectrophotometer is set up inside the chamber with the uv photometer module in the beam coming from the monochrometer. A calibrated uv detector is attached to a vacuum mechanical feedthrough so that it can be swung in and out of the test beam. This set up allows testing of the uv photometer channel to be done which could not be done in air. Two tests are done with this set-up: 1) The wavelength response for the uv filter and PM tube. 2) Responsivity comparison with a standard uv source. These tests will result in measurement of the wavelength response and the absolute sensitivity of the uv photometer channel. 11

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