1、WARNING EYE HAZARD MIL-T-48604 (e 1 March 1971 MILITARY SPECIFICATION TUBE, LASER, PLASkA, HELIUM NEON: 117467fi THE LASER BEN CAN BE DANGEROUS AND CAUSE BLINDNESS IF IT ENTERS THE EXES EITHER DIRETLY OR REFLECTE OFF OF A REFLECTED SURFACE. BEFORE FIRING THE LASER, OPERATOR SHOULD TAKE ADEQUATE PREC
2、AUTIONS TO ASSURE MAXIMUM smm. This Specification is approved for use by all Departments and Agencies of the Department of Defense. 1; SCOPE 1.1 Scope.- This specification covers a helium neon plasma laser tube consisting of a plasma tube, a ballast resistor, and high voltage plug-in connectors, enc
3、apsulated in an austenitic corrosion-resistant steel cylindrical case (see 6.1). 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent: specified herein. SPECIFICATIONS Mi lit
4、 ary MIL-E-7 5 Electron Tubes, Preparation for Delivery of MIL-F-13926 Fire Control Material, General Specification Governing the Manufacture and Inspection of MIL-T - 239 9 1 Training Devices, Military; General Specification for MIL-I -45607 Inspection Equipment; Acquisition Maint enance, and Dispo
5、sition of Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Frankford Arsenal, ATTN: SARFA-MDM, Phila., Pa. 19137 by using the self-addressed Standardization Docu- ment Improvhent Propo
6、sal (DD Form 1426) appearing at the end of this document or by letter. FSC 1240 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-* STANDARDS MILITARY MIL-STD- 105 MIL-STD-109 Sampling Procedures and Tables for Inspection Quality Assurance Tenns and De
7、finitions By Attributes e DRAWINGS B11739401 Gage, Interchangeability B11739402 Gage, Interchangeability F11739861 Power Supply Fu746 79 7 Tube, Laser, Plasma, Helium Neon (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement f
8、unctions should be obtained from the procuring activity or as directed by the contracting officer). 3. REQUIREMENTS 3.1 Fabrication.- The tube shall be manufactured in accordance with Drawing F11746797 and related docments thereto. assembly design and final configuration shall also comply with the r
9、equirements specified in 3.1.1 through 3.1.8. The tube 3.1.1 Materials.- The materials shall be in accordance with MIL-T-23991 as applicable as well as material specifications, general specifications and figures forming a part of this specification. 3.1.2 Encapsulating compound.- The encapsulating c
10、ompound shall be a stable shock absorbing material capable of maintaining alignment between the plasma tube and the inside diameter of the cylindrical case for the specified life of the laser tube, under all specified conditions, or combinations thereof. encapsulating compound shall prevent arcing o
11、r corona between electrodes and between each electrode and the cylindrical case. compound shall be in accordance with impregnating, filling, potting, and encapsulating compounds of MIL-T-23991. c Dielectric strength of Encapsulating 3.1.3 Fungus - inert materials.- Only fungus-inert materials in acc
12、ordance with MIL-T-23991 shall be used. 3.1.4 Internal mirrors.- The plasma tube shall have permanent, factory-aligned, internal mirrors requiring no alignment or other maintenance. 3.1.5 Coaxial reservoir.- The plasma tube shall utilize a coaxial reservoir to reduce the space requirements and to im
13、prove ruggedness and life. 3.1.6 Cold cathode.- The plasma tube shall utilize a cold cathode. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-48604 12 9999906 0427422 7 MIL-T-48604 (MU) 3.1.7 Ballast resistor,- A ballast resistor shall be pro
14、vided as part of the laser tube assembly. The value of the ballast resistor shall be selected to achieve the operating characteristics of Figure 2 when us- ing a power supply that has 70k f 10% ballast resistance. 3.1.8 Co however, the correction to the manufacturing process or procedure (et al) sha
15、ll be accomplished. 4.5.2.4 Unassignable cause.- If upon failure analysis no assignable cause is evident and the malfunction is considered random in nature, the malfunction shall be chargeable reliability failure and as such must be considered in the above demonstration. The decisions as to chargeab
16、le reliability failure must be coordinated with the procuring activity, Frankford .Arsenal Reliability 7 to determine comp1ianc;e with the re- quirements of 3.7, 3.8 and 3.9. Subsequent to the burn-in test the tube assembly shall be sub- 4.6 Environmental tests., To determine compliance with all of
17、the requirements of 3.6 the tube assembly shall be subjected to the tests specified in 4.6.1 through 4.6.5. There shall be no evidence of corona when the laser tube is subjected to each of the specified environmental tests. Data shall be recorded prior to operation, during operation and post operati
18、on in accordance with all of the environment test procedures specified herein. Available post-test data may be used as pretest data for the succeeding test. Complete environmental test data shall be re- corded and submitted as a part of reliability data. 4.6.1 Storage and operating temperature,- To
19、determine compliance with 3.6.1 and 3.6.2 this test shall be performed in accordance with MIL- STD-810, Method 501 and 502, Procedure I respectively. Prior to this test the tube assemblies shall have successfully passed the performance tests of 4.7.1 through 4.7.4. The tube assemblies shall be place
20、d in the temperature chamber. The chamber temperature shall be lowered to the storage temperature or d65OF and remain at this extreme temperature for at least 24 hours. The chamber temperature shall then be raised to th operating temperature of OOF and remain at this temperature for at least four ho
21、urs. While the tube assemblies are 0F they shall be subjected to performance tests of 4.7.1 through 4.7.4. After the tube assemblies have successfully passed the performance tests, they shall be energized and re- main on throughout the period that the chamber is raised from OF to 100F. During the pe
22、riod they are energized, power output of the laser beam shall be monitored to determine compliance with the requirement of 3.7.3. When the chamber temperature reaches the storage temperature of +155 OF, the chamber shall remain at this temperature for not less than 24 hours. The chamber temperature
23、shall then be lowered to the operating temperature of 100F and remain at this temperature for not less than four hours, tube assemblies shall again be subjected to the operational test 4.7.1 through 4.7.4. ber shall be returned to room ambient temperature while the tube assem- blies are energized an
24、d the output power shall be monitored. ambient temperature the tube assemblies shall be subjected to all of the performance tests of 4.7 to determine compliance with the requirements of 3.7. The After being subjected to these performance tests the cham- At room 4.6.2 Vibration.- To determine complia
25、nce with 3.6.3, the test shall be performed in accordance with MXL-STD-810, Method 514.1, Procedure VIII, Figure 5M.1-6 Curve “Y“ and the conditions specified in 3.6.3: During vi- bration, the tube assemblies shall be energized and the power output moni- tored, of 4.5.4.1 and 4.7.1 through 4.7.6, in
26、clusive to determine compliance with the requirements of 3.5.1 and 3.7.1 through 3,7.6. Subsequently, the tube shall be subjected to the performance test 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-c _-_ _ _ MIL-T-4Bb04 32 0b 0427433 B m MIL-T
27、-48604 (MU) 4.6.3 Shock.- To determine compliance with 3.6.4, the test shall be performed in accordance with MIL-STD-810, Method 516.1, Procedure I, Fig- ure 516.1-2, at 75 Gs for 11 milliseconds. After the shkck tests the tube assemblies shall be subjected to the performance tests of 4.5.4.1 and 4.
28、7.1 through 4.7.6 inclusive to determine compliance with the require- ments of 3.5.1 and 3.7.1 through 3.7.6. 4.6.4 Humidity.- To determine compliance with 3.6.5, the test shall be performed in accordance with MIL-STD-810, Method 507, Procedure I, with the following exception, The test duration shal
29、l be a minumum of 24 hours at 95% relative humidity and limited to one cycle. Subsequently the tube assemblies shall be subjected to performance tests of 4.7.1 through 4.7.9 inclusive to determine compliance with the requirements of 3.7.1 through 3.7.9. 4.6.5 Altitude.- To determine compliance with
30、3.6.6, the test shall be performed in accordance with MIL-STD-810, Method 500, Procedure I. Sub- sequent to this test the tube assemblies shall be subjected to the perform- ance tests of 4.7.1 through 4.7.6 inclusive to determine compliance with the requirements of 3.7.1 through 3.7.6. 4.7 Performan
31、ce characteristics.- Compliance with 3.7 shall be de- termined by means of tests specified in 4.7.1 through 4.7.10. The tests shall be performed utilizing a power (high voltage) supply simulating that shown on Drawing F11739861. The high voltage power supply shall be capable of varying the output vo
32、ltage of between 5 KVDC to 12 KVDC to an accuracy of +lo0 VDC unloaded. Means shall be provided to dump the full voltage across the laser tube assembly. assembly during lasing shall be measured to an accuracy of 250 VDC. The current shall be measured to an accuracy of 5-0.1 milliamps D.C. An os- cil
33、loscope shall be connected such that the time between the applied volt- age and the resulting laser output can be measured. A He-Ne power meter capable of measureing 2 milli-watts and having an external commector for an oscilloscope shall be provided to measure the waveform of the laser pulse as see
34、n by the detector. uring 638.8 Nanometers laser power to 4 0.10 milli-watt accuracy. All test equipment shall be calibrated and traceable to the National Bureau of Standards. i The voltage drop across tube The power meter shall be capable of meas- NOTE: If the laser tube fails to lase or has insuffi
35、cient power output allow a maximum of 30 minutes warm up time before performing 4.7.1 thru 4.7.10, 4.7.1 Starting voltage.- Utilizing the test equipment specified in The output power shall meet the requirement of 3.7.3 within the 4.7, apply 7.5 KVDC across tube assembly. scope. time specified ih 3.7
36、.2. crease the voltage to 8 KVDC. determine compliance with the requirement of 3.7.1. fully passing the previous test, the voltage shall be increased to 12 KVDC View the power waveform on the If tube does not lase with 7.5 KVDC applied, in- Measure power output and starting time to Subsequent to suc
37、cess- 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-7 MIL-T-48604 12 7777706 0427432 T W MIL-T -48604 (MU) A- c and applied to the tube assembly. the requirements of 3.7.2 and 3.7.3. at least a 30 second rest between applying these over-voltage
38、pulses. The plasma tube shall lase and meet This shall be repeated 10 times with 4.7.2 Starting time.- This tzst shall be-performed in conjunction with 4.7.1 to determine compliance with the requirements of L7.2. 4.7.3 with 4.7.1 to determine compliance with the requirements of 3.7.3. A Cali- brated
39、 He-Ne power meter shall be used (with an output for an oscilloscope) to monitor the power to within 0.10 milli-watts. Power output.- This test shall also be performed in conjunction 4.7.4 Sustaining current.- With the voltage developed across the tube assembly of between 1.2 KVDC to 1.6 KVDC (see F
40、igure i) and the power output within the requirements of 3.7.3. shall be measured to determine compliance with the requirements of 3.7.4. The current through the tube 4.7.5 Frequency sensitivity.- With a 75 volt peak-to-peak ripple volt- age at a frequency varying between 5 to 25 KHZ superimposed on
41、 the input for a period of not less than five minutes, the tube assembly shall be iubsequently subjected to the test of 4.7.1 to 4.7.4 inclusive to deter- mine compliance with 3.7.5. 4.7.6 Beam alignment.- Beam alignment shall be accomplished by es- tablishing a true line of sight from the geometric
42、 center of the clamping diameter to a wall target. ure 2, rotate the tube assembly 360“ and note diameter of the circle tran- scribed by the laser spot. in 3.7.6 (2 milli-radians). The laser beam existing from the tube assem- bly shall be centered within 0.01 inch of the center of the clamping dia-
43、meter, With the tube assembly held as shown in Fig- The diameter shall not exceed that specified 4.7.7 Beam roundness.- Beam roundness is required to verify TEMoo mode. (Fundamental mode). the projected beam using a microscope objective with at least a 1 cm aperture and a short focal length (approxi
44、mately .25cm) to enlarge the beam spot. The observed spot shall be round in shape without discontinuities in the intensity across the diameter. Beam roundness is accomplished by visually observing 4.7.8 Beam divergence.- Beam divergence shall be calculated using the maximum diameter as determined in
45、 4.7.7 and the distance between the laser tube and the wall target in the following relationship: a. Divergence rad = d i R, where: R = distance from laser tube to wall target. d = maximum diameter of laser spot. The results shall not exceed the mill-radians specified in 3.7.8. 13 Provided by IHSNot
46、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-r .- 0 MIL-T-48604 (MU) 4.7.9 Beam exit diameter.- This test shall be performed utilizing a fixed aperture (1.4mm) at the exit beam and measuring the power through the aperture to determine compliance with the requiremen
47、ts of 3.7.9. 4.7.10 Voltage current characteristics,- This curve shall be estab- lished at room ambient temperature, with the output power maximized and a voltage drop across the tube assembly of between 1.2 and 1.6 KVDC. the tube current from five to 10 milli-amps and record voltage drop changes, T
48、he curve shall be as specified in Figure 1. Vary 4.8 interchangeability.- This test shall be performed utilizing the interchangeability gages conforming to Drawings B11739401 and BU739402 to determine compliance with 3.8. 4.9 Marking.- To determine compliance with 3,9, a visual examina- tion shall b
49、e conducted as specified in MIL-STD-130. 5. PREPARATION FOR DELIVERY 5,l Preparation for delivery shall be in accordance with the require- ments of MIL-E-75, package group 23. each laser tube shall be inclosed in a sealed water-vapor-proof barrier bag filled with desiccant. For level A preservation-packaging, 6. NOTES 6.1 Intended use,- The laser tube assembly is used as part of a Laser Tank Gunnery Trainer by the US Army. is a training device which will mount in the M73 M
