INFRARED SOURCES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03300A001100010001-6
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: May 3, 2011
• Sequence Number: 1
• Publication Date: November 18, 1955
• Content Type: MEMO

Sanitized Copy Approved for Release 2011/05/03: CIA-RDP78-03300A001100010001-6
CONFIDENTIAL
18 November 1955
REFERENCE : Memo for: C/TSS/APD (dated) 15 November 1955
From : C/TSS/WAD
Subject : Same as above
1. The 13 specifications as set forth in the referenced memorandum
are discussed as follows:
a. The "lightweight for aircraft installation" feature
simply means that castings if used should be of aircraft type
metals rather than the cast iron mountings we have been using
in the past. There is no specific limit on weight; however,
lightweight construction or aircraft type construction should
be used throughout.
b. The mounting type should be of conventional yoke
type which is controlled remotely by means of Servo electro
methods.
c. The horizontal movement should be 1200
.
d. The vertical movement 1000.
These features, though they may present some small engineering
problems are not considered to be insurmountable.
e. Beam angle 20 to 40? or more.
This can be accomplished remotely by means of a fish scale
type reflector with a moving-light source.
g. "Q dynamic loads up to 300 knots."
These specifications are normal for aircraft type installations
and no particular difficulty in achieving this is anticipated.
h. "Minimum range 10? beam 1,000 feet (with AN/SAR-4
viewer)"
i. "Power requirements 125 amps at 28 volts do or
CONFIDENTIA
Sanitized Copy Approved for Release 2011/05/03: CIA-RDP78-03300A001100010001-6
 Sanitized Copy Approved for Release 2011/05/03: CIA-RDP78-0330OA001 100010001 -6
CONH 'N IA
We have achieved somewhat in excess of a thousand foot range
with a six degree beam and a 3,000 watt light source; There-
fore, no particular difficulty is anticipated.
J. Light Sources. Tungsten is preferred over carbon
arc due to the reliability factor.
k. Continuous use 15 hours - 30 hours has been achieved
by using a 3,000 watt tungsten source.
1. The all weather capability means that it should be
either weather proof or not adversely affected by inclement
weather.
m. Ceiling. At present the anticipated use is in
helicopter installations. However, if ranges in excess of
1,000' can be achieved and if other features of the gear are
favorable, it is believed that there will be a possibility
of installing this equipment on conventional type fixed
wing aircraft where it would be conceivable that the ceiling
would be approximately 45,000'. This will present a number
of engineering problems, the partial answers to which should
be in the files of any competent aircraft lighting company.
On the basis of the requirements and specifications as
set forth in the referenced memorandum, it is recommended
that the panel favorably consider a project to develop this
equipment.
Distribution:
1 - Subject File
1 - Chrono
1 - RTW
TSS /APD
1j (17 Nov 55)
CONFIDENTIAL
Sanitized Copy Approved for Release 2011/05/03: CIA-RDP78-0330OA001 100010001 -6