Techbriefs... Electronic Components and Circuit, Electronic Systems,... 02-09... National Aeronautics and Space Administration... September 2002

52 Pages·2002·12 MB·English

by  National Aeronautics and Space Administration

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National Aeronautics and
Elecirenic Components and Circuits
Electronic Systems
Physical Sciences
Materials
Computer Programs
Mechanics
Machinery
Fabrication Technology
Mathematics and information Sciences
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Life Sciences
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02-09 Fa September 2002
INTRODUCTION
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ters and program offices listed below.
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Ames Research Center John F.K ennSpeeced Cyent er NASA Program Offices
Carolina Blake Jim Alibert At NASA Headquarters there are seven major program offices that
[phone] or [phone] or Gevelop and oversee technology projects of potential interest to industry:
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NASA Tech Brets. Saptemnb2e0r0 2
NASA Tech Brnefs, March 2000
S TechBriefs
Space Administration
5 Electronic Components and Circuits
9 Electronic Systems
13 Physical Sciences
21 Materials
27 Computer Programs
31 Mechanics
37 Machinery
41 Matheand mInaformtatiion cScisenc es
|2|#6 O@)1|\ O 9 @)
45 Life Sciences
This document was prepared under the sponsorstup of the National Aeronautics and Space Administration. Neither the United States
Government nor any person acting on behalf of the United States Government assumnes any lability resulting from the use of the information
Contained in ths Gocumnent, or warrants thet such use will be free from privately owned nights.
4 LANG PACE
Electronic Components and
Circuits
Hardware, Techniques, and Processes
7 Multiple-Pump Lasers
7 Clamps for Testing Cable Shields and Connector Shells
NASA Tech Bnets, Septernber 2002 5
6 BLANK PAGE
Multiple-Pump Lasers
Fiber-optic coupling ise xploited to increase reliability NASA's Jet Propulsion Laboratory,
without excessive Complexity. Pasadena, California
been common practice to pump a Nd:YAG
Crystal by use of a single Ghode laser How-
ever, Giode lasers are nnt relable enough to
Support long-life, high-pcwer operation. if
# To Na YAG Crystal
mustiple Gode lasers could be used to
pump a single Nc: YAG crystal, then laser
operation would br less degraded by the
Geteonr faiolurer ofa a stinglie Giooden las er.
One alternative scheme for coupling ight
from multiple laserp-umcpsi iontod ae si n-
gle Na: YAG crystal would involve the inte-
Qration of mufipie laser clodes, along with
relatively Complopiticcs, aontto ea sding le
Light From Multiple Pump Lasers is coupled through optical fibers into a ferrule, wherein the
Chip. in such an arrangeimte wonultd ,no t
indipumvp bieamds eure acomlbine d.
be possible to change the number of
pumps. Monsover, the pumps would not be bines the multiple pump beams into a sin- this invention. inquines concemmnng nghits for
isoflroam etaceh odthe r, so that faiureo f gle beam aimed into the Nd:YAG crystal. itsc ommusee shrouldc bei adadreslsed to
The failure of one laser diode does not intelleAscsettsu Oafflic e
affect the operation of the others, and the JPi.
bgt from the others continues to pump Mail Stop 202-233
the Nd:YAG crystal. 4800 Oak Grove Drive
This work was done by Serge Dubovitsky, PasadeCnA a91,10 9
Jerry Viuidler, and Duncan Liu of Caltech for [phone]
tively simple optics. The output ends of the NASA's Jet Propulsion Laboratory. E-mail: ipgroup@jpl_ nasa.gov
fibers of multiple independent fiber-cou- Further inforim caonttaiineod nn a TSP Refer to NPO-30353, volaund mnuembe r
piled laser diodes are bundled together in a [see page 1} of this NASA Tech Briefs issue, and the
ferme (see figure). A gradient-index-of- in accowrith dPubalic nLawc 9e6-51 7, page numbe
retraction (GRIN) lens in the ferrule com- the contractor has elected to retain ttle to
Clamps for Testing Cable Shields and Connecior Shelis
Connector test amps (CTCs) are ciesn>- jaw mounted onto a manualy operated applwheire ca staandatrd ialigoatorn cli p is
ng @ectica connectors Gesigned for use in ratcheting Clamp that can be released by fin- not sufficiert.
testing electrical continuity for the back- Qe pressure on a lever CTCs can be made This work was done by Kenneth A
Gel ot a connector at one end of a shwaidied with jaws of various siz3s and shapes to fi a Reaume of United Space Alliance for
@ectrica cable, trough the cable swakd, to vanofe cotnneyct or shels or anpicatiors. Kennedy Space Center. for further nfor-
te bade? at fe ote ard of te cable. Each CTC is machined to alow connection mation, please contact Phi Restivo, 1150
CTCs increase the refabiity of testing of of a standard banane-jack-ttiepstp eradd . Garmin Ave., M/S: USH-100D . Houston,
shieided electrical cables beyond thut Once the CTC is Gia nped into place, ore TX 77058, Tal. No. [phone], E-rial:
actwevable with aligator caps flor which sult- end of the test lead is neared rio the jaw Philip. G. Restivo@USAHO. UnitedSpace
aie atlachnet ports offen carrot be ao te othe into ary ype of test equp- Aliance.com
found. Each CTC consists of a conductive ment required. CTCs can be utiized in any KSC-12286
NASA Tech Bnets. Septembe20r0 2
BLAMES PAGE
Electronic Systems
Hardware, Techniquesa,nd Processes
11 Generalized Pre-Processor for Block and Convolutional Codes
11 improved Transponder for Earth’SpacCeomcmurniacaftito n
12 Making Audible Alarms More Noticeable in Noisy Environments
NASA Tech Briefs. Sapternt2e0r0 2