1、I INCH POUND I MIL-PRF-49156B 4 March 1999 Superseding O1 October 1980 MIL-L-49156A PERFORMANCE SPECIFICATION EYEPIECE ASSEMBLY, FOR NIGHT VISION GOGGLES, AN/PVS-5( ) This specification is approved by the U.S. Army Communications- Electronics Command (CECOM), Department of the Army, and is available
2、 for use by all departments and agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the Eyepiece Assembly, part of the Night Vision Goggles, AN/PVS-5 ( ) (see 6.1). 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3
3、and 4 of this specification. This section does not include documents in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specif
4、ied requirements cited in sections 3 and 4 of this specification, whether or not they are listed. Beneficial comments (recommendation, additions, and deletions) and any pertinent data which may be of use in improving this document should be addressed to: HQ, USA Communications-Electronics Command, A
5、TTN: AMSEL- LC-LEO-E-EP, Fort Monmouth, NJ 07703-0523, by using the Standardization Document Improvement Proposal (DD Form 1426) or by letter. AMSC N/A FSC 5855 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. 1 Licensed by Information Handling ServicesMIL-PRF-49156B
6、 2.1.1 Reference documents, drawings, and publications. The following other Government documents, drawinqs, and publications form a part of this document to the extent specified herein. are those cited in the solicitation (see 6.2.b). Unless otherwise specified, the issues DRAWINGS USA COMMUNICATION
7、S-ELECTRONICS COMMAND SM-C-804193 - Eyepiece Assembly SM-D-804194 - Adapter, Eyepiece SM-D-804195 - Cell Assembly-Eyepiece and all associated drawings (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific procurement functions should be
8、obtained from the procuring activity or as directed by the contracting officer.) 2.2 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable
9、 laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Construction. The Eyepiece Assembly, referred to hereinafter as the eyepiece assembly, shall be constructed to comply with the performance requirements in the contract, drawing SM-C-804193 as applicable, and as
10、specified herein. The Eyepiece Cell Assembly, which is part of the eyepiece assembly and is referred to hereinafter as the cell assembly, shall be in accordance with drawing SM-D-804195-1 (glass) as applicable and as specified herein. The Eyepiece Adapter, which is part of the eyepiece assembly and
11、is referred to hereinafter as the adapter, shall be in accordance with drawing SM-D-804194 as applicable and as specified herein. 3.2 First article test inspection. When specified in the contract or purchase order, the contractor shall furnish eyepiece assemblies for first article test (FAT) inspect
12、ion and approval (see- 6.2 .c) . 3.3 Parts and materials. The contractor shall select parts and materials fully capable of meeting all operational and environmental requirements specified herein. The materials specified on the applicable drawings are recommended, but not mandatory. Verification that
13、 the assembly meets the overall performance requirements shall be the governing acceptance standard. 3.4 Performance characteristics. 3.4.1 Equivalent focal length. The equivalent focal length of the eyepiece assembly shall be 27.0 millimeters (mm) 10.3. 3.4.2 Flange focal distance. The flange focal
14、 distance of the cell assembly shall be 0.410 inch I 0.020 where the measurement is taken from the side of the 1.5490 inch cell assembly diameter closest to the focal plane (see SM-D- 804195). 3.4.3 Concentricity. 3.4.3.1 Cell assembly concentricity. The concentricity of the optical axis and the mec
15、hanical axis associated with the 1.243 inch diameter shall be as specified on cell assembly drawing SM-D-804195. 2 Licensed by Information Handling ServicesMIL-PRF-49156B 20 lp/mm 82% 7 8% 62% 32% 17% 7 8% 7 8% 3.4.3.2 Adapter concentricity. The concentricity of the mechanical axis associated with t
16、he 1.551 inch diameter and the mechanical axis associated with the 1.244 inch diameter shall be as specified on adapter drawing SM-D-804194. 30 lp/mm 6 6% 60% 42% 23% 12% 60% 60% 3.4.4 Linear distortion. The linear distortion of the eyepiece assembly at the edge of the 18 mm format shall be between
17、7.0 percent and 9.5 percent pincushion distortion. 3.4.5 Field of view. The field of view of the eyepiece assembly shall be 40“ I2 for the 18 mm format. 3.4.6 Exit pupil versus eye relief. The exit pupil diameter of the eyepiece assembly shall be no less than 9.8 mm at an eye relief of 15.0 mm 10.2
18、for a zero diopter setting. 3.4.7 Field flatness/field tilt. The field flatness/field tilt shall deviate no more than I 1/3 diopter over an 18 mm format with a 40 mm concave radius of curvature at the zero diopter image plane of the eyepiece assembly. 3.4.8 Transmission. The transmission of the eyep
19、iece assembly shall not be less than 78 percent over its full aperture for the spectral output of phosphor type number 10-52 (RCA F2126 or equivalent) (see 3.9.5). 3.4.9 Modulation transfer function (MTF). The MTF values of the eyepiece assembly shall not be less than those specified in Table I when
20、 tested using an S-11 photomultiplier tube and a green filter (Wratten No. 58 or equivalent over a 2856 K I200 tungsten light source) to simulate P-20 illumination in the test setup. Table I. Modulation transfer function. Orientation failure of any finish; dents or breakage; failure of any hardware,
21、 connection, interface, or component. 3.9.2 Ambient (room) temperature. Ambient (room) temperature is defined as 23C I 10 Co. 3.9.3 Environmental temperature. Environmental chamber temperatures shall be controlled to within I5C“ of the specified temperature unless otherwise specified. 3.9.4 Optical
22、cell. The optical cell is defined as the cylindrical part of the cell assembly which is in direct contact with the lens elements and spacers, holds the lens elements and spacers in their fixed relative positions, and has no external pins, sleeves, flanges, retainers, or other surfaces or fittings at
23、tached to it in any manner. 3.9.5 Phosphor type 10-52. The peak spectral response of this phosphor occurs at a wavelength between 0.510 micrometer (pm) and 0.560 pm. The bandwidth measured at the 10 percent points of the spectral response curve is equal to or less than 0.200 pm. The spectral respons
24、e at 0.650 pm is equal to or less than 10 percent of the peak spectral response. 3.9.6 g. g is defined as the magnitude of the earths mean surface gravitational-acceleration with a value of 32.2 feet per second per second. 4 Licensed by Information Handling ServicesMIL-PRF-49156B Inspection Weight V
25、ibration Temperature extremes Temperature shock Immer s i on Modulation transfer function 4. VERIFICATION Requirement Paragraph 3.4.10 3.5.1 3.5.2 3.5.3 3.5.4 3.4.9 4.1 Classification of inspection. Inspection shall be classified as follows: a. First article test inspection (see 4.2) b. Conformance
26、inspection (see 4.3). 4.2 First article test inspection. Each eyepiece assembly in the first article test (FAT) inspection lot shall be subjected to the inspections of Table II. Samples selected from the lot shall be subjected to the inspections of Table III. Sample size shall be as specified in the
27、 contract or purchase order (see 6.2.c). Failure of any inspection shall be cause for rejection of that eyepiece assembly and may be cause for failure of the FAT inspection. Inspections may be performed in any order except that the Modulation Transfer Function shall be performed last. Table II. Unit
28、 first article test inswection. I Inspection Equivalent focal length Flange focal distance Concentricity Cell assembly concentricity Adapter concentricity Linear distortion Field of view Exit pupil versus eye relief Field flatness/field tilt Transmission Modulation transfer function Requirement Para
29、graph 3.4.1 3.4.2 3.4.3 3.4.3.1 3.4.3.2 3.4.4 3.4.5 3.4.6 3.4.7 3.4.8 Table III. Samwle first article test inswection. 4.2.1 Disposition of FAT inspection samples. After successful completion of the FAT, the FAT units shall be refurbished and delivered in accordance with the contract. 4.3 Conformanc
30、e inspection. Requirements for conformance testing shall be as specified in the contract or purchase order (see 6.2.e). Unless otherwise specified, all tests shall be performed at ambient temperature (see 3.9.2). 5 Licensed by Information Handling ServicesMIL-PRF-49156B 5. PACKAGING 5.1 Packaging. F
31、or acquisition purposes, the packaging requirements shall be as specified in the contract or purchase order (see 6.2.9). When actual packaging of material is to be performed by DOD personnel, these personnel need to contact the responsible packaging activity to ascertain requisite packaging requirem
32、ents. Packaging requirements are maintained by the Inventory Control Points packaging activity within the Military Department of defense Agency, or within the Military Departments System Command. Packaging data retrieval is available from the managing Military Departments or Defense Agencys automate
33、d packaging files, CD-ROM products, or by contacting the responsible packaging activity. 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. The eyepiece assembly is part of the AN/PVS-5( ) Night Vision Goggles,
34、 used for general purpose viewing during periods of darkness. 6.2 Acquisition requirements. Acquisition documents must specify the following: a. b. C. d. e. f. 9. Title, number, and date of this specification. Issue of DODISS to be cited in the solicitation and, if required, the specific issue of in
35、dividual documents referenced (see 2.0). Statement identifying that FAT testing is or is not required and, if so, the sampling requirements for FAT. Quantity and schedule for FAT testing and disposition of FAT samples. Statement identifying that the contractor must submit his proposal for conformanc
36、e inspection containing the specific requirements to be verified and the sampling plan that will be used to provide the desired confidence level. Necessary actions by the contractor in the event of an inspection lot failure. Levels of preservation and packaging (see 5.0). 6.3 Definitions. See 3.9. 6
37、.4 Subject/term/keyword listing. Eyepiece assembly Eyepiece cell assembly Eyepiece adapter 6.5 Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extensive changes. 6 Licensed by Information Handling ServicesCustodian: Army - CR Air Force - 11 Review Activity: Army - AT Air Force - 99 MIL-PRF-49156B Preparing Activity: Army - CR Project 5855-0196 7 Licensed by Information Handling Services
