ARMY MIL-A-49382-1980 AFOCAL ASSEMBLY AN VSG-2《AN VSG-2无焦点装置》.pdf

1、MIL-A-49382 58 7977706 OLb3b20 5 =-y MIL-A- High temperature. 37.3 Low temperature. The afocal assembly shall not be damaged by storage to +71 C and operation to +52OC. to -32OC and storage to -57 C, Fe afocal assembly shall not be damaged by operation 307.4 Shock. With the afocal assembly mounted t

2、o a fixture it shall with- stand the following shocks. a. Basic design: 28 gs, 6 milliseconds, 1/2 sine, 18 shocks b. High intensity: 65 gs, 0.75 millis.econd, 1/2 sine, 18 shocks ce Bench handling: total. total . bench handling during normal maintenance activities. The afocal assembly shall not be

3、damaged by 3.7.5 Vibration. The afocal assembly shall not be damaged by vibration to the following random and superimposed sinusoidal levels for a period of 15 minutes in each of three mutually perpendicular axes. Random: 1 x loq3 g2/Hz, 5 to 500 Hz Sine: 0.26 gs, Octave 1 42 to 84 Hz X axis 0.78 gs

4、, Octave 1 42 to 84 Hz Y axis 0.85 gs, Octave 1 42 to 84 Hz 2 axis 4 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-49382(ER) 3.7.6 Altitude. The afocal assembly shall oper

5、ate at altitudes up to s 10,000 feet above sea level and withstand transportation at altitudes up to 40,000 feet above sea level without damage. 3.8 Preconditioning. Each afocal assembly shall be subjected to a 26.65 hour minimum preconditioning prior to delivery. 3.9 Cleanliness. The afocal assembl

6、y shall contain no foreign matter such as dirt, dust, fingerprints, moisture, etc. 3.10 Weight. The total weight of the afocal assembly shall be 6.0 pounds maximum. 3.11 Treatment and painting. Unless otherwise specified, the afocal assembly and its components and parts shall be cleaned, treated and

7、 painted in accordance with the applicable drawing. 3.12 Nameplates and product marking. Unless otherwise specified, the afocal assembly, parts, components, subassemblies, and assemblies thereof shall be marked in accordance with DLSM-B-805093. 3.13 Workmanship. Workmanship shall be. in accordance w

8、ith MIL-STD-454, Requirement 9. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the con- tract, the contractor is responsible for the performance of all inspection requirements as specified herein. tract, the contractor may use his own or any other fa

9、cilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services

10、conform to prescribed requirements. Except as otherwise specified in the con- 4.2 Classification of inspections. Inspections shall be classified as follows : a. First article inspection (see 4.3) b. Quality conformance inspection (see 4.5). c. Inspection of packaging (see 4.9). 4.3 First article ins

11、pection. Unless otherwise specified in the contract, first article inspection shall be performed by the contractor. 4.3.1 Inspection. All materials, parts, processes and assemblies shall be examined for conformance to the applicable specification or drawings. ions shall be made using MIL-STD-105, Ge

12、neral Inspection Level II with a 2.5 percent AQL for mechanical anda 4 percent AQL for visual inspection, except as noted in table I. Inspect- 5 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license

13、 from IHS-,-,-MIL-A-4938 2 (ER) TABLE I. Inspections. Inspection requirement Percent Requirement Inspection AQL paragraph criteria - Any part or component Weight not as specified 2.5 3.10 MIL-STD-252 Workmanship not as specified 2.5 3.13 MIL-STD-454 missing or damaged 2.5 3.2, 3.49 3.5 MIL-STD-252 M

14、arking not as specified 2.5 3.2 Treatment and painting not as specified 2.5 L/ 3.2 Dimensions not as specified 2.5 3.2 I l/ MIL-STD-105, Inspection Level S-3 or objective quality evidence. 4.3.2 Tests. Upon successful completion of inspection specified in 4.3.1, first article afocal assemblies shall

15、 be subjected to the tests in table II. Tests shall be conducted in the order listed. constitute first article failure . Failure of any tests shall TABLE II. First article inspection, Inspection Preconditioning Efective focal length, NFOV Transmission NFOV MTF Dimensions NFOV NFOV Focus Relative ill

16、umination Distortion Field flatness Effective focal length WFOV Transmission WFOV Dimensions WFOV FOV alignment Line-of-sight movement Torque Temperature shock High temperature Low temperature Shock Vibration Altitude Requirement paragraph 3.8 3.6.1 3.6.2 3.6.3 3.6.4 3.6.5 3.6.6 3.6.7 3.6.8 3.6.9 3.

17、6.10 3.6.11 3.6.12 3.6.13 3.6.14 3.7.1 3.7.2 3.7.3 3.7.4 3.7.5 3.7.6 Test paragraph 4.8 4.6.1 4.6.2 4.6.3 4.6.4 4.6.5 4.6.6 4.6.7 4.6.8 4.6.10 4.6.11 4.6.12 4.6.13 4.7.1 4.7.2 4.7.3 4.7.4 4.7.5 4.7.6 4.6.9 4.6.14 Copyright Communications - Electronics Command Provided by IHS under license with CRAIN

18、ot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-7382 58 77777Ob OLb3bZb b m MIL-A-49382(ER) 4.4 Inspection procedures. Unless otherwise specified herein, the afocal Linearity assembly shall be tested at an ambient temperature of 23OC, - +5OC. of photometric me

19、asurement setups shall be within 5 percent. 4.5 Quality conformance inspection. 4.5.1 Inspection. Inspection shall be as specified in 4.3.1. 4.5.2 Tests. 4.5.2.1 Group A inspection. Group A inspection shall be conducted on specified in 4.5.1. in any order. unit. Group A tests listed in table III may

20、 be performed Failure of any test shall be cause for rejection of that TABLE III. Group A inspection. . Requirement paragraph Inspect ion Preconditioning FOV alignment Line-of-sight movement . MTF 3.8 . 3.6.3 3.6.12 3.6.13 . Test paragraph 4 4.8 4.6.3 4.6.12 4.6.13 4.5.2.2 Group B inspection. Group

21、B inspection shall assemblies selected from units which have passed the tests in 4.5.2.1. Sampl- ing of lots (see 6.2) .shall be in accordance with MIL-STD-105, AQL 2.5 percent defective, inspection level S3 combined. Group B tests listed in table IV may be performed in any order. TABLE IV. Group B

22、inspection. inspect ion Effective focal length, NFOV Transmission NFOV NFOV Focus Relative illumination Dis tort ion Field flatness Effective focal length WFOV Transmission WFOV Tor que Requirement paragraph 3.6.1 3.6.2 3.6.5 3.6.6 3.6.7 3.6.8 3.6.9 3.6.10 3.6.14 be conducted on afocal Test paragrap

23、h 4.6.1 4.6.2 4.6.5 4.6.6 4.6.7 4.6.8 4.6.9 4 6.10 4.6.14 7 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-49 3 8 2(ER 4.5.2.3 Group C inspection. Group C inspections shall

24、 be conducted on afocal aseemblies selected from units which have passed the teats in 4.5.2.1. The sample(s) ehall be tested in accordance with the inspections listed in table V. Samples shall be selected in accordance with 4.5.2.3.1, Group C tests listed in.table V shall be performed in the order l

25、isted. 4.5.2,d.l Sampling for inspection. Three afocal assemblies shall be selected by the Government for all inspections in table V whenever the monthly quantity specified in the contract starts quality conformance testing, or every 30 days, whichever occurs first. with inspection lots as prescribe

26、d in MIL-STD-105. requisite is that the three units conform to normal production processing. The first three Group C units shall begin testing at the time the first quality conformance lot (see 4.5.2.2) begins Group B testing. The three units are not associated The only selection pre- TABLE V. Group

27、 C inspection. Inspection Dimensions NFOV Dimensions WFOV Temperature shock High temperature Low tempera ture Shuck Vibration Altitude Requirement paragraph 3.6.4 3.6.11 3.7.1 3.7.2 3.7.3 3.704 3.7.5 3.7.6 Test paragraph 4.6.4 4.6.11 4.7.1 4.7.2 4.7.3 4.7.4 4.7.5 4.7.6 4.6 Tost methods, Assemblies s

28、hall be tested in accordance with all tests listed in table II and in accordance with Government-approved test procedures. Unless otherwise specified, tests shall be conducted at ambient temperature with radiation in the 7.6- to 11.75-micrometer spectral region. 4.6.1 Effective focal length, NFOV. T

29、he effecEive focal length of the afocal assembly with the optical imager shall be measured using either Method 1 or Method 2 or calibrated focal length method of MIL-STD-150 with suitable equipment substitution required for the specified spectral region. Failure to meet the requirements of 3.6.1 sha

30、ll constitute failure of this tost . 4.6.2 Transmission. The transmission to the afocal assembly shall be measured with the optical imager using Method 6 of MIL-STD-150 within the applicable spectral region and shall be determined after dividing out the transmission of the imager alone. 3.6.2 shall

31、constitute failure of this test. Failure to meet the requirements of 4.6.3 Modulation transfer function (MTF). The MTF of the afocal assembly NFOV and WFOV with an optical imager shall be measured using a test set calibrated and designed to provide frequency and modulus. The MTF shall be 8 Copyright

32、 Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-measured either continuously or in discrete steps between O and 10 linepaire pez millimeter. narrow and wide field of view. blackbody source

33、l elit and a pyroelectric detector. A bandpass filter of 7.6 to 11.75 micrometers. shall be used to limit the spectral band. An IR imager which has greater .than 74 percent MTF at 10 lp/m shall be used to image the slit onto the scanning deteetor. shall constitute failure of this test. : The MTF tes

34、t shall be run at infinite conjugates for both The measurements shall be performed with B Failure to meet the requirements of 3.6.3 4.6.4 Dimensions NFOV, Set the NFOV on an in-line fixture with an IR imager and a detector. collimator, folded off a large mirror, adjustable in both elevation and azim

35、uth. Rotate the mirror to the full off-axis position-(first left, then right) and move the detector until the signal is received. Repeat this for the fall elevation motion (both up and down). detectable over both extremes of movement and that the drop in signal level is no greater than 40 percent wh

36、en compared to the on-axis signal. Failure to meet the requirements of 3.6.4 shall constitute failure of this test. Align this assembly to a targetprojected by a Verify that the target is . 4.6.5 NFOV focus. during the test of 4.6.13, verify that the MTF at the resolution frequency has not dropped m

37、ore than 10 percent. Failure to meet the requirements of 3.6.5 shall constitute failure of this test. When the thermaltarget is in the 5Ometer position 4.6.6 Relative illumination. The NFOV and WFOV relative illumination of the afocal assembly/imager shall be measured using Method 8 of MIL-STD-150 w

38、ithim the applicable spectral range. Failure to meet the requirements of 3.6.6 shall constitute failure of this test. 4,6.7 Distortion The distortion of the afocal assembly (WFOV and NFOV) shall be measured using either Method 27 or Method 28 of MIL-STD-150 as applicable. Failure to meet the require

39、ments of 3.6.7 shall constitute failure of this test. 4.6.8 Field flatness. The field flatness shall be measured for a flat field MTF in accordance with 4.6.3 for both NFOV and.WFOV. the requirements of 3.6.8 shall constitute failure of this test. Failure to meet 4.6.9 Effective focal length WFOV. T

40、he effective focal length of the afocal assembly with imager shall be measured using either Method 1 or Islethod 2 or the calibrated focal length method of MIL-STD-150 with suitable equipment substitution required. for the specified spectral region. Failure to meet the requirements of 3.6.9 shall co

41、nstitute failure of this test. 4.6.10 Transmission WFOV. The transmission to the afocal shall be measured withsthe IR optical imager using Method 6 of MIL-STD-150 within ehe applicable spectral region and shall be determined after dividing out the-transmission of the imager alone. OE 3-6.10 shall co

42、nstitute failure of this test. Failure to meet the requirements 9 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-Am49 382 (ER :.i 4.6.11 Dimensions WFOV. Switch the afocal to

43、 WFOV and using the procedure of 4.6.41 verify the FOV. constitute failure of this test. 4.6.12 FOV alignment. Failure to meet the requirements of 3.6.11 shall 4 Using the sethp of 4.6.4, move the mirror to the Switch FOV and move ehe detector until the signal again Record the change in position and

44、 confirm that this is less than a axial in-line position; set the afoca1.h WOV; and move the detector until the signal peaks. peaks. corresponding object space displacement of 30 mils, other field points and confirm that the difference in the readings corresponds to a tilt between fields of view of

45、less than 10 mils in object space. ing the amount o shift of a slit targe5 requires b0th.a tangential and sagittal scan. silure of this test. Repeat this for two Find- Failure to meet the reqairements of 3.6.12 shall constitute 4.6.13 Line-of-sight movement. Using the in-line fixture accurately alig

46、ned to the optical axis of the coslimator, set the afocal to NFOV and center the detector on the thermal target, Move the target to the 50 meter position, focus and verify.that the image has not shifted more than 0.1 mil relative to the object space. Failure to meet the requirements of 3.6.13 shall

47、constitute failure of this test. 4.6.14 Torque. Standard torque meaduting equipment capable of measuring Failure to meet the torque value specified shall be used for this test. adapter shall be used with the torque measuring equipment. the requirements of 3.6.14 shall constitute failure of this test

48、. An appropriate 4.7 Environmental tests. Unless otherwise specified, environmental tests shall be performed in accordance with MIL-STD-810 as modified by this specification. where operation is specified by MIL-STD-810 shall be FOV alignment (4.6.12), and modulation transfer unction (4.6.3) . 4.6.14

49、 shall be run upon completion of all environmental tests. The performance tests required during environmental tests Performance tests 4.6.1 through . 4.7.1 Temperature shock. The afocal assembly shall be tested in accord- Failure to meet requirements of 3.7.1 shall con- ance with MIL-STD-810,0Method 503, Procedure I except that the temperature of step 2 shall be -54 C. stitute failure of this test, 4.7.2 High temperature. The afocal assembly