1、 MIL-PRF-2958OC W 999990b 2073157 174 = MIL-PRF-29580C 17 September 1998 SUPERSEDING 16 December 1993 MIL-S-2958OB PERFORMANCE SPECIFICATION SPECTACLES, AVIATORS, MULTIPLE WAVELENGTH LASER PROTECTIVE, EDU-5/P (WITH CASE) This specification is approved for use by all Departments and Agencies of the D
2、epartment of Defense. 1. SCOPE 1.1 Scope. This specification addresses the requirements for rotary and fixed wing aviators spectacles with carrying case, designated EDU-5P, which provide protection against multiple fixed laser wavelengths. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in
3、 this section are specified in sections 3 and 4 of this specification. This section does not include documents cited 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 us
4、ers are cautioned that they must meet ail specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addr
5、essed to: Commander, Naval Air Warfare Center Aircraft Division, Code 414100B120-3, Highway 547, Lakehurst, NJ 08733-5100, by using the Standardization Document Improvement Proposai D Form 1426) appearing at the end of this document or bv letter. AMSC NIA FSC 8465 DISTRIBUTION STATEMENT A. Approved
6、for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-2958OC 2.2 Other Government publications. The following Government publication forms part of this document to the extent specified herein. Unless o
7、therwise specified, the issues are those cited in the solicitation. NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY (MST) NIST Circular 533 NIST Special Publication 374 - Method for Determining the Resolving Power of - Method for Determining the Resolving Power of Photographic Lenses Photographic Len
8、ses (Application for copies should be addressed to the National Institute of Standards and Technology, Inquiries Office, Building 101, Room A903, Gaithersburg, MD 20899.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless othe
9、rwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unless . otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2). AMEFUCAN SOCIE
10、TY FOR QUALITY CONTROL (ASQC) ASQC-21.4 - Procedures, Sampling and Tables for Inspection by Attributes. OD adopted) (Application for copies should be addressed to the American Society for Quality Control, 61 1 East Wisconsin Avenue, P.O. Box 3005, Milwaukee, WI 53201-3005.) AMERICAN SOCIETY FOR TEST
11、ING AND MATERIALS (ASTM) ASTM-D4 12 - Vulcanized Rubber and Thermoplastic Rubbers and Thermoplastic Elastomers - Tension, Standard Test Methods for. OD adopted) ASTM-D 1003 - Haze and Luminous Transmittance of Transparent Plastics, Standard Test Method for. OD adopted) ASTM-D1415 - Rubber Property -
12、 International Hardness, Standard Test Method for. OD adopted) ASTM-D393 5 - Polycarbonate (PC) Unfilled and Reinforced Material, Standard Specification for. OD adopted) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-29580C 0b 2073359 TY7
13、 e MIL-PW-2958OC (Application for copies should be addressed to the American Society for Testing and Materials, 1 O0 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text o
14、f this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), samples shall be subjected to first article inspection in accordance with 4.2. 3
15、.2 Materials. The contractor shall select the materials, but the materials shall meet all the operational and environmental requirements specified herein. 3.2.1 Lens material. The polycarbonate material used for the spectacle lenses shall be in accordance with ASTM-D3 93 5. 3.3 Desim. The spectacles
16、 shall provide protection for aircrew against multiple fixed laser wavelengths. They shall be compatible with all helmets, visors, and other head attached hardware that Navy and Army rotary and fixed wing aircrew use. They shall not require external power or apparatus. All cockpit displays, lights,
17、and phosphors shall be visible when the spectacles are worn. 3.3.1 Lenses. The lenses shall meet the protection requirements of this specification. Lenses shall have scratch resistant surfaces. Markings on the lenses shall be in accordance with 3.6.1. 3.3.2 Frame. The fiame shall be corrosion and he
18、at resistant. The color of the frame shall be black. It shall be compatible with the Chemical Biological Radiological (CBR) Protective Assembly, Type Designator AR22P-90. Ifvarious frame sizes are required to meet the protective requirements, these sizes shall be marked on the frame and shall be in
19、accordance with 3.6.1. 3.3.3 Carrying case. A black carrying case shall be provided with each pair of spectacles. It shall have a means of closure. A specified force applied to the lens area of the closed case, in accordance with 4.5.6, shall not damage the spectacles. The inside surface shall be su
20、fficiently smooth to prevent lens scratches. Marking shall be in accordance with 3.6.2. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-nIL-PRF-29580C W 9999906 2073360 769 MIL-PR.F-2958OC 3.3.4. Lens overlav template. A lens overlay template shall
21、 be included with the carrying case if the spectacles use an eye centered design. The lens overlay template shall locate the optical center of the lenses and allow this location to be temporarily marked on the lens. 3.4 Performance characteristics. 3.4.1 Visual and dimensional examination. When visu
22、ally and dimensionally examined, the spectacles and carrying case shall meet the requirements specified herein. Table I shail be used to identi the defects. 3.4.2 Optical reauirements. 3.4.2.1 Matching. When tested as specified in 4.5.1.1, the design eyepoint of the right and left lenses of the spec
23、tacles shall match in location and shall match at the design eyepoint of each lens in sign, prism, and power to the requirements of 3.4.2.2.1, 3.4.2.2.2, and 3.4.2.3. 3.4.2.2 Prismatic deviation (optical power). 3.4.2.2.1 Vertical urismatic deviation. When measured at the design eyepoint of the righ
24、t and left lens as specified in 4.5.1.2.1; the prismatic power shall not: a. Exceed a prism imbalance of O. 125 diopter for prism of the same or opposite base (base up - base up I O: 125 or base down - base down 0.125 or base up - base down I O. 125). b. Exceed 0.25 diopter of base upbase down or ex
25、ceed a total of 0.5 prism diopter of the same base (base up + base up I 0.5). 3.4.2.2.2 Horizontal prismatic deviation. When measured at the design eyepoint of the right and lefi lens as specified in 4.5.1.2.2, the prismatic power shail not: a. Exceed a prism imbalance of O. 125 diopter base in (bas
26、e in - base in 5 O. 125) or 0.25 diopter base out (base out - base out s 0.25). b. Exceed 0.25 diopter for base idbase out or exceed a total of 0.5 prism diopter of the same base (base out +base out I 0.5). 3.4.2.3 Suhericai and cylindrical power. When measured as specified in 4.5.1.3, the spherical
27、 and cylindrical power of the plano lenses shail not exceed k. 125 diopter at any point on the lens or differ in sign at left and right design eyepoint. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-295 SOC 3.4.2.4 Lens defects. When insp
28、ected as specified in 4.5.1.4, the spectacle lenses shali be free from irregularities affecting optical qualities. 3.4.2.5 Lens fit. When inspected as specified in 4.5.1.5, the spectacles shall show no evidence of visible space between the fiame and lens. 3.4.2.6 Curvature. When measured as specifie
29、d in 4.5.1.6, the curvature of the lenses shall be not less than 5 diopters, nor greater than 15.5 diopters. 3.4.3 Spectral transmittance requirements. 3.4.3.1 Optical density and angular protection. When tested as specified in 4.5.2.1, the spectacles shali have the required optical density and prev
30、ent passage of threat wavelengths or laser radiation regardless of the threat incidence angle (see 6.2). 3.4.3.2 Transmittance. When computed as specified in 4.5.2.2, the scotopic transmittance shall be not less than 20 percent. Photopic and scotopic transmitance shall not differ by more than 1 O pe
31、rcent of the measured value between lenses or over the surface of the lens. 3.4.3.3 Near-infrared transmittance. When computed as specified in 4.5.2.3, the average near-infkared transmittance shall be less than 15 percent. 3.4.3.4 Erythemal ultraviolet transmittance. When computed as specified in 4.
32、5.2.4, the erythemal ultraviolet transmittance shall be not greater than 0.2 percent. 3.4.3.5 Haze. The haze value of the lenses shall be minimized and when determined as specified in 4.5.2.5, shall be not greater than 4 percent. 3.4.3.6 Abrasion resistance. After being subjected to the abrasion tes
33、t specified in 4.5.2.6, haze shall be not greater than 6 percent and the transmittance shall not decrease by more than . 4 percent. For example, an initial value of 20 percent transmittance shall not decrease to less than 16 percent. 3.4.4 Environmental requirements. 3.4.4.1 Radiation-induced damage
34、 resistance. When the lenses are tested as specified in 4.5.3.2 and 4.5.3.3, transitory or permanent radiation-induced changes in the optical density or transmittance shall not occur at power levels up to 100 millijoules (mj). 3.4.4.2 High temperature. When tested as specified in 4.5.3.4, the specta
35、cles shd withstand high temperature stresses, with no delamination at lenses or coatings. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-2958OC 9999906 2073162 531 MIL-PRF-295 80C 3.4.4.3 Low temperature. When tested as specified in 4.5.3.
36、5, the spectacles shali withstand low temperature stresses, with no delamination of lenses or coatings. 3.4.4.4 Temperature shock. When tested as specified in 4.5.3.6, the spectacles shall withstand the effects of rapid changes in ambient temperature, with no delamination of lenses or coatings. 3.4.
37、4.5 resistance. The spectacles shail be tested in accordance with 4.5.3.1 and the procedure outlined below. The salt used for this test shall be sodium chloride containing (on a dry basis) not more then O. 1 percent sodium iodide and not more than 0.5 percent total impurities. A 5 k 1 percent soluti
38、on shall be prepared by dissolving 5 parts by weight of salt in 95 parts by weight of water. The solution shall be adjusted to, and maintained at a specific gravity (see figure 3) by using the measured temperature and density of the salt solution. Sodium tetraborate (Borax) may be added to the salt
39、solution as a pH stabilization agent in a ratio not to exceed 0.7g sodium tetraborate to 75 liters of salt solution. The pH of the salt solution as collected as fallout in the exposure chamber shall be maintained between 6.5 and 7.2 with the solution temperature at +35 “C (+95 OF). Only diluted chem
40、ically pure hydrochloric acid or chemically pure sodium hydroxide shall be used to adjust the pH. The pH measurement shall be made electrometrically or colorimetrically. 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-29580C W 9999906 207
41、3372 q0 = MIL-PRF-2958OC Step 1 - Prepare the spectacles in accordance with 4.5.3.1. Step 2 - Adjust the test chamber temperature to 35 “C (95 OF). Photograph the spectacles. Step 3 - Mer the introduction of salt fog, the spectacles shall remain in the chamber for 48 hours. Step 4 - Remove the spect
42、acles from the chambers. Wash and photograph the spectacles. Step 5 - The spectacles shall be stored at ambient temperature for 48 hours. Photograph the spectacles at the end of this period. Following the salt fog resistance test, the spectacles shall meet the requirements of 3.4.2 and 3.4.3. 4.5.4
43、Impact resistance. A 16-mm steel bail weighing approximately 16 grams shall be dropped fiom a height of 1270 mm on the upper horizontal surface of the lens. The steel bail shall strike witbin the geometric center of the lens. The lens itself shall be supported by a rigid acrylic plastic or steel tub
44、e 25 +3 mm on the inside diameter, 32 33 mm on the outside diameter, and approximately 25 mm in height. The lens support tube shall be affixed to a rigid iron or steel base plate. Total weight of the base plate and fixtures shail be not less than 12.2 kg. The top edge of the tube shail have a secure
45、ly bonded 3 by 3 mm neoprene gasket having a hardness of 40 f5 as specified in ASTM-D1415 and a minimum tensile strength of 8.3 MPa as specified in ASTM-D4 12, with a minimum ultimate elongation of 400 percent as specified in ASTM-D4 12. The diameter of the lens support may be modified so that the n
46、eoprene gasket may support the lens at its periphery. The ball may be guided in its fiee fall by being dropped through a tube, extending to within 1 O0 mm of the lens. The lens shall meet the requirements specified in 3.4.5. 4.5.5 Frame. 4.5.5.1 Corrosion resistance. When the spectacles are subjecte
47、d to the salt fog resistance test of 4.5.3.9, the fiame shall meet the requirements specified in 3.4.6.1. 4.5.5.2 Heat resistance. When the spectacles are subjected to the temperature shock test of 4.5.3.6, the fiame shall meet the requirements specified in 3.4.6.2. 4.5.5.3 Ductility. The temple of
48、the spectacles shall be bent 45“ (once) over a 6 mm (0.25 inch) mandrel. The temple shall meet the requirements specified in 3.4.6.3. 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-29580C 999990b 2073373 317 MIL-PRF-2958OC 4.5.5.4 Adhesi
49、on of dating. Adhesion of test articles shall be performed at room temperature by means of the following bend test. Plated temples shall be bent repeatedly through an angle of 180 on a diameter equal to the thickness of the temple until fracture of the base material occurs. No detachment of the coating shall be possible by probing with a sharp instrument. Cracks in the base metal or plating shall not be cons
