test 24121-2 for s/n v-3 infrared detector for · pdf filelk21t1 s/n v-3 infrared detector for...

(NASA-CR-143638) LK21T1 S/N V-3 INFRARED N75-15954DETECTOR (Honeywell, Inc.) 34 p HC $3.75

CSCL 14BUnclas

...... ___G_ _5£35 _95 90_

TEST REPORT NO. 24121-2

FOR

LK21T1 S/N V-3 INFRARED DETECTOR

FOR

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION

GODDARD SPACE FLIGHT CENTER

GREENBELT, MARYLAND

CONTRACT NO. NAS5-21961

BY

HONEYWELL INC.RADIATION CENTER2 FORBES ROAD

LEXINGTON, MASSACHUSETTS 02173

https://ntrs.nasa.gov/search.jsp?R=19750007882 2018-04-29T08:20:12+00:00Z


TABLE OF CONTENTS

INTRODUCTION PAGE 1

DEVICE DESCRIPTION 2

DATA SUMMARY 3

NOISE SPECTRUM FROM 10 H9 TO 50 KH9 4

D* VS. BIAS CURRENT 6

RELATIVE SPECTRAL RESPONSE 2 TO 16[tM 7

RESPONSIVITY VS. MODULATION FREQUENCY 16

RESPONSIVITY VS. DETECTOR TEMPERATURE 18

D*p VS. MODULATION FREQUENCY 20

D*X VS. DETECTOR TEMPERATURE 22p

D*X VS. WAVELENGTH 6.7 TO 16iM 24

DETECTOR RESISTANCE VS. TEMPERATURE 26

DETECTOR TEST APPARATUS DESCRIPTION 28

HANDLING AND USE PRECAUTIONS 30

-ii-


INTRODUCTION

The detector reported herein was fabricated to determine the

feasibility of atmospheric sounding from synchronous orbit

for water vapor and carbon dioxide.

The device was extensively tested both before and after a 24-

hour soak at 500C and relative humidity of 95 percent. No

degradation in performance as a result of the 'soak" was ob-

served. Although not intended for space flight use, thisdetector was fabricated to Honeywell s High Reliability Work-

manship Standards.

The device contains a single Photoconductive HgCdTe element

designed to operate in the six to fifteen micron region.

-1-


DEVICE DESCRIPTION

HRC Detector Identification LK21TI S/N V-3

HRC Element Identification 40371S136D10

Type of Detector Photoconductive HgCdTe

Date of Manufacture June, 1974

Detector Operating Temperature Range 800 K to 120 0 K

Field of View 900

Element Active Area Length 0.0048 Inches

Element Active Area Width 0.0049 Inches

Detector Resistance at Room Temperature 14.6 Ohms

Optimum Bias Current 4.0 Ma

-2-


DATA SUMMARY

Noise Ampl. 4D- DD* Rxp RMIN R6 .7/ Bias Volt.Tem. F Signall Noisel Gai D* 6 7 D88 0 11.0 *14 0 D 14 5 p (volts/ (volts/ R Current Drop Power(Kv) (Hz) (mv) (mv) x10 x100 x10 x101 0 xl01 0 xl018 (microns) watt) watt) p (ma) (my (mw)

95 2K 2.10 .031 4.70 1.00 1.20 1.53 1.12 .995 11.0 3760 2250 60% 4 137 .55

100 2K 1.65 .026 4.70 .958 1.12 1.29 1.09 .905 11.0 2950 1850 63% 4 132 .53

105 2K 1.28 .025 4.70 .726 .892 1.17 .794 .632 11.0 2310 1247 54% 4 128 .51

95 750 2.10 .038 4.70 .816 .979 1.25 .914 .812

100 750 1.65 .032 4.70 .778 .910 1.05 .886 .735

105 750 1.28 .030 4.70 .605 .743 .975 .662 .527

1Actual measurements made at Amplifier Output with 6 Hz bandwidth Wave Analyzer

D*A (X, Hz, 1, 900) in CmHzl/2w-1

-3-

Test Report No. 24121-2

Noise SpectrumLK21T1 S/N V3 Pre Soak 105 0K I -4ma

----- -- - -

C..'

.iJi. -:-

0o -s - - 1. - - - ---. -- i-- - - - -- - -- - -----

... ...... ......

4 T

t --- - t.~... . . . .. . . . .........-~ ~- i- - r ... ..... . . ... .... ... ......... --- ---------. . . . . .. . . ... .. . . . . . . . . . . ..

- - - ----- ----- ------o - - ----.--------- --------

-- .------

0 .irO ....... ..... ._._.i._... - . . - -- . ...... ~ . . . -. . ....i i l- - -r - - ..... .... . -' .. .... ... .. .. _. - -r- r.l_.. .. ..-...... -... .. :... ...... .... ... ... l. -!.......-...... ....... --. -i. ... .

. ... . . . . .. .... i . . . . ......... ~.. ......... . .... . ~.i _.. ........ .. ...... .-- -- ---- # -- - +; . ..... .. , .............. ..... - "-- . .. . -+ -+-"!" - "- .... ........ . ..... . ... :"

" " - ' r. _..... . . ...... ... .-,-,-'_-r --. . . ... ..... . ....... ....... ....... . --- - - -,-- .............. ...... . -- .. . ... .......... ....... -... . . .. ... ...... .. ...... ... : . .. " - - -- .. .. .. '

1 . ....... .................... .... "-' ...... ..... :. • '

O- . -I -. -- . ;-.-- -i - .- .... ... .- . - _. .. .. - .. . _ ... .. . ... i/- .......... . .... - -........ ------ -- ! ', .: :. . ... i. ...... ~

t-) p foe" , *

4-4-

. : - .. ... . i :

- .l a 1 O . -i .- i : . ., ! .

a, i:

a $ -.:::_ _r::.i: _ ................. __. ....................... ...... ............ _ i-_ ...................... .............. . ............. __ ------__ _ --__ _ _ _ -

. ....... .... .. ....... _.- -- -.- ---- -- .- - -.- --- ! - .. ... . . .... .. ... .. .... ........ ... ... ....... ..... -r -i -T - .... .... ...... ... ...... ... . ..... .... ...... ... ....... .. ... ...... .... ... ........ : ... .... . ........ . . . : . . .... - . . . .... . .. ... .--+I ....

,-. . . ..... .... . .. . ! . .. .. .... .. .. : . ...:. .; .......... .. .... . ... .... .. .. . .. . ..;_. .. . .. . .... ..... ....... .. . .. .. . ..... . .. 1 . . . .. ... .. ... ... . . ... . .... .... ..... i . . ... ..... .. .. .. . .... : . .... .. ... . .. ', -.: .. ..

i : : ~ ~~~~~~~~ ~~~~~i : { '-. ! :{ : : , t ; -:; '

t Frequency (Hz)

-4-


Noise Spectrum LK21T1 S/N V3 Post Soak 105 0K I B4ma

; .... " - .......--- -.... .- - ----- ---- -- - - ------ -- --0-- -- - - -

0

I-'- -I--- -- - ~--,- - -- 4 ------.-- _---.-------- ---- -- ~ ~ .~- :_-

0....-.-.........--- . :-:- -... ........ ...... ..--..-. .--........ ........ ..- . • -......-- -- - . . .... .....-. . .......

- -- - ---------- -

S. . _ - . .. .... - -- ---..... . ------ .....

U)----------------- - .1-*--- -- ---- J-i-- -- ------ ------ ----------- ;---__ _ ---- -

.f -- o --- -- - - - --

Frequency (Hz),-5--5-


P/Y so/ILK ].K 7- 17"Jf_ /N V3

D*X vs Bias, Responsivity (R.) vs Bias

r(iil! ) ] J 1 |, It:: i:t k, : 1

4-C4'3

-3 000

! 4.-

3h I 414-)ir4

it

i'I :;.; ;,i

Z +I

BIAS CURREN (in illiaps)

17 b N V?

" .D,%,X vs Biasp, Responsivity (R ) vs Bias Tip 1! 0 i

' Z !!- ,- - ~ ,,: -: ,ii;

I-f,

S 1.2

1111 i'!; 4 i i

..... ~ ~ ,~ i , tt i ;+1 I

!I :I L. tza:

. . . . . ....I i: j :I ' i

it'

I ,.I'.,'* I'

I 191 ii

BIAS CURRENT (in milliaraps)

K T Ii i i ii :: ; :: :: : : : 1 : i i t: : i: : l~ ; : ! i ::: 'I i

'I :: ! '.

0. Z 4 L-:, 14 o

BIAS URRENT (in illianps)

6 Iii1 i i!t~ r iiiv

Test Report No. 24121- 2

Relative Spectral Response

Pre Soak Temperature 800 K

81

0 3-

Wavelength (microns)

Post Soak

10

77.

6--

1. 2 25 i 2

E07 7otSa



Pre Soak Temperature 85 oK

-4.4

1

0 .5 ; 2 j

S.5 2 2 5 3 4 5 6 7 8 9 10 .5

Wavelength (microns)r-4i i i'i

1.5 25 3 4 5 6 7 8 9 10 1.5 2


8, 8 ak



Pre Soak Temperature 90 OK

• i (I . .. . ...

.5 2 2.5 3 4 5 6 7 8 9 10 1.5

a,1


Post Soak

6- --":.--•-....-,-. ..-

0

25

S.5 2 25 3 4 5 6 7 8 9 10 1.5 2


9i:-9ii -

_9 ,



Pre Soak Temperature 950K

10 . -

6.5- -. . . ..... .. . . .:: :: : t 1,4:;

2. .

P4 - -- - a e - egt . (-i 7

44 q .

1 1.5 2 .5 10 2

a0

0r4

r-4-


_10.

9~;l:lj.~~~I.~~~ - - - -:

6- --- ~~ -~ :-~~:il I i:lb.1;:. :

Po1o -o




7-1! -- . - - - 2 ... .i: 1 \ .

6 , ! ::! il i : I i , ii i;l ! !.Ii, iIi : i :-i-"

II I ;i

Q) L, . . . I: : " . : :

2: : :- , . I i:l

1.5 2 25 3 4 5 6 7 8 9 10 1.5 2


6.11





9.

6 -i ! i t l ' -

It! i!!HW 0liitii illli h! 1i !!!1i i ' ]i ..i ..'l

!Post Soak

12

-12-

-12,,oa




10. .

.. ..0.w Ii .i ..... .. .. ..

Wi 2.5

S il " '. " , i t! ! •

1 2 2: 5 3 4 5 8 10 . 2

1 1.5 2 2.5 3 4 5 6 7 8 9 10 1.5 2


Post Soak

.4 2 5.

S1.5 2 25 3 5 6 7 9 10 1.5 2


13 ,-



Pre Soak Temperature 1150K

9 , r t .

5-t : !T ' i A ['. i': A : t i; l i

i - i iii jii I:' : I: : '

r-

1 - . 2 l ii, 8 9 10 1.5 2

al)

1.5 2 2.5 3 4 5 6 7 8 9 10 1.5 2


14-

0- !;i i ' i I' .l :

('3 i




-i r! .t.. .-- .. I'.... ...

Cd

1 .5r

115 2 2 5 3 5 6 7 8 9 0 1.5 2


Post Soak

0r-lU)

S1.5 2 25 3 4 5 6 8 9 10 1.5 2


15 .

i: :I " ..I: I::: 1.5 2i 2/ 5 3 6 7\:: 8 9 10 1 .5

Wavelength: (mcos


--Responsivity vs Modulation Frequency Pre Soak 105 0K IB 4ma

3 4 5 67891 2 3 4 5 67 891 2 3 4 5 67891 2 3 4 5 6 7891 2 3 4 5 6 7891

---- r

2 -7

oo4j

S10 Io I( 10k

Modulation Frequency (Hz)-16 -

---- --- -:_

P5 i1i10 too 10ki-?i: -L-~i-j:tl-Modulatin Frequncy (Hz

d -16-


Responsivity vs Modulation Frequency Post Soak 105 0K IB=4ma

2 3 4 5 67891 2 3 4 5 67891 2 3 4 5 67891 2 3 4 5 67891 2 3 4 5 67891

9

-------- 71_--t i

4

3

2--41)rJ

08

0 6

>

t -ii i r - - - -_ -iii i-i tl - -

5 __

-17-

to took;iiii-1~ l

V)Modulation Frequency (Hz)

-17


Pre Soak I =4maResponsivity, R Bvs --7- .

Detector Temperature --- --..------ - ....

6 ----- ---- _ _ _ ..... . ... -- ....... ... . ----"

------------- --- -------------------------

0 - - ... ... ... " -_- . ... 1- . . .

- ------ - -- .- - -. ....._ _ _ _ _ _ -- _ .

o ~ -~i : - t--- ---.----- ------- ___ _ ------- ----- -- -- -

4-i . ... . . _ _ _ _ , .. --

Temperature (0 Kelvin)

r-4

r--4--'----

4j- - - ---- -- ---- -------

-r4> ' -;-~~-~~' --- ' ~ ~ -~~- ~

0Y

Temertue Celin

TestReport No. 24121-2

R esponsivity, R vs Post Soak IB=4ma

--t Detector Temperature --

r-4

__ _ --- I--I-- i .-----------h __ - - -- - _ __ -

___ - -i-i

-------------------- I i I ____ ...... ------

r-4

4--)r-4

>

3 - - .. --' i .... iv3

C~I

08

... i, ,i-t L i i T m rau 0 eLv ..in)- -----------------. ..

xt

I_ _-t - - t -it: - - - t- -- ~ _ I_ _.I_ __ • _i .- - - - - - - - --- . . .

Temperature (° Kelvin) -19-


D*1 vs Modulation Frequency Pre Soak 105°K IB-4ma

2,I 3 4 5 67891 2 3 4 5 67891 2 3 4 5 67891 2 3 4 5 67891 2 3 4 5 67891

9T8I

6

5

4 :;

TITH

IlllI111

C: 8Iif "iL41 " 2 V

,-46s

hi 8tt

N :i

7

r-4

~ 1 6

• F : ::1: -i i

Moduatio Freuenct(Hz

4-20-- ------ ;

C) H - -- 4:i

r- 4:i:~C f: -i Fi

9 g?3t

FI i-ri~-4

4 --1 J--c

7 T -4

Eiel %;~ttlee Kt: t~-

Moduatio Freuenc (Hz-20-li =,

. . L. - -.. ......-- -- ---- --. - - --7..... -i-C / I . t .i --- 7 i'I"

rr.4."

, -f ~

_zt 7jj T

4.1 I-I .K . .h

4.-e

(D i ,,i : i -

f- Is i I

0

SI-

0 t±TIij nit.i~it 1'

I K Ii trl _:!_ i :LL, i - ,:l~i

o 7

i : I : r

T, ..i

0 - 4

7- - 4 -- L

71 4 01 _j C. .i ... -t i -i i--i;' - -i i, -/_ t ' i i .. . .

I i

i i. . [.

" 'ii-ii : . : "! -" i i.!: 'I .... .. .. i i i ! .. i2T 1 . I 1 I . i.

""." ,,.I,

0 I'

I Ai

Ill-i-i -.1

4J4

ORIGIN A P AGE I

I---~ -I4:t..._j I :iT~~i I ^_ .:i

OF OO .U A IT (I I i I z .ma) d

.i I 0 I -

J -y--- - . _...

---------- L L-:--- i i- i-!--~i~

ORIGINAL PAGE IS

OF POOR QUALITY ( _ M Z -I 1U) 01 1 x C

cl ~ j..~.1 i/ 01:- -ti -i - i


D* vs Detector Temperature---PPre Soak I = 4 ma

T J -- , L . i

0- -

0So- a( t90 0-22-

-22-


D* vs Detector Temperature

Post Soak I = 4 ma

3 .-- - - - -

- L I I : ,

So ' i I ge- 5 to t I '' i s : o

4i 10

11-'

Temperature (0Kelvin)

-23-

X-23


D* vs Wavelength

Pre Soak 105 0 k I B= 4 ma

".o

1.0

v-

0

.2 .

6 o7 8 I . it. 13 lo Is t.

Wavelength (Microns)

-24-


D* vs Wavelengthxp

Post Soak 105 0 K IB= 4 mar-B

1.

6 ' 0i 1 9 1 .. .. . . .. il 13"i

* I i .... .

Wavelength (Microns)

-25-


Detector Resistance vs Temperature

Pre Soak I B 4 ma

i , , I .-7 ____ ____

30

r0_

oe too log I& .

Temperature ( Kelvin)

-26-

Test Report NO. 24121-2

Detector Resistance vs Temperature

Post Soak IB= 4 ma

.. .. -7-

. ._ . . .. I- -,--. . . - -.--------.-- ---- . . .

-.--. - - 7 --

,0 -- --- ---

+' X41;t7 + - --. i '4,

U, _ _" - . . i j _ _ . . _ . . - ----+-C ------ 1 J.

____ -- 7 -- 1 --- L.L __ _ _ _ _ _ _ _ _ _

Temperature ( Kelvin)

-27-


DETECTOR TEST DESCRIPTION

LIST OF TEST EQUIPMENT

The following equipment or its equivalent was used to test

the detector electrical characteristics:

1. Blackbody source - IRI Model 403

2. Blackbody temperature controller - IRI Model ISL 101R

3. Wave analyzer - HP Model 302A

4. Integrating VTVM - IRI Model 602A

5. Oscilloscope - HP type 547

6. Preamplifier and battery bias supply - HRC design

7. 1 KHz sine wave chopper - HRC design

8. Spectrometer - Perkin Elmer Model 112

9. Variable temperature dewar - HRC design

-28-


Calculation of D*bb

Detector Temperature 77 oK

Chopping Frequency 1,000 Hz

Detector Area (AD) See Test No. 4

Orifice Diameter (d B) 0.050 inch

Blackbody Temperature (T ) 500 oK

Background Temperature (c) 300 K

EmissivityBlackbody (EB) 1.0

Chopper (E ) 1.0

Noise Bandwidh (Af) 6 HzChopper RMS Factor (K ) 0.35

Detector to Orifice Distance (D) 15 cm 10-12Stefan-Boltzman Constant (K2) 5.67 x 10

RMS Noise Correction (K3 ) 1.12

Amplifier Gain (same for signal & noise) 4,000D* Formula:

* 4 12 (Af)1/ 2 SD 4 -S

BB 2 4 N[BB K1 K2 K d (EB TB- C Tc N

4 2 SResp B2 4 x

BB 2 T ADGK1 K2 d (EB TB - C Tc D

DETECTOR READOUT CIRCUITRY

Variable Load 100-i1 K

Detector Wave

100 ohm Analyzer IRI

0-12 V Hewlett Integrating

Variable 4 K

10 or 100 ohm Input

Bias MonitorOscilloscope

Monitor

-29-


HANDLING AND PRECAUTIONS FOR HRC PRECISION INFRARED DETECTORS

This precision infrared detector was built in the laboratories

of the Honeywell Radiation Center with the utmost care, usingsome of the most modern technology. However, as with any preci-sion piece of equipment, there are tolerance limitations to

which it can be subjected physically, thermally, and electrically.

Operating Temperature: The detector is designed to operate at

temperatures between 80 and 1200 Kelvin.

Window and Housing: Parts may crack or break if subjected to

high impact. Always transport the detector in the container in

which it was shipped.

Detector Element Burnout: The detector element dissipates only

m2iiwatts ot power, therefore, do not over bias it.

A. Caution: If a lead from the detector breaks contact with

bias circuit:

1. Turn off bias and amplifier power source.2. Discharge coupling capacitor by shorting test leads.

3. Re-connect detector element to bias supply.4. Turn bias power on again.

B. When the detector is connected to any power source, there

must be no voltage differential between the contacts until

after the circuit is complete.

C. Do not use any amplifier circuit that may generate current

surges in the detector.

D. The detector should be operated only in a cooled condition.

If the cooling unit should malfunction without operator'sknowledge, Honeywell suggests that a current voltage limiterbe installed in the bias circuit to prevent burnout when

the

detector element warms.

Normally, meters used to measure resistance have a 1.5 volt

battery. The current generated by the battery is sufficient to

burnout the detector. Therefore, if resistance must be measured,

observe the following:

-30-


A. Use Wheatstone bridge with an external battery to produce

a current/voltage level compatible with Honeywell s test

results.

B. When the detector is in an operating circuit or system, use

a VTVM with selector switch set to VOLTAGE. Read voltage

drop across detector and compute resistance by Ohm's Law.

Be cautious of power ground loops between the VTVM and

detector circuitry. Connect common ground first, then

connect VTVM to high side of detector. If VTVM is of a

high impedance, use a series limiting resistance in VTVM lead.

Resistance values up to 1% of VTVM input impedance will cause

no voltage reading errors.

If in usage, it is necessary to expose this device to elevated

temperatures, do not exceed +650 C.

Lead Soldering: Use a low melting temperature solder on leads

attached to the detector pins. The detector wires are soldered

to the pins with 1150C melting temperature solder. The feed

thru pins are extremely short. Do not allow the temperature to

build up to the point where detector wires become unsoldered.

Use a well grounded iron or heat tip to melt solder then dis-

connect power cord from socket prior to soldering the leads to

the pins.

-31-

test 24121-2 for s/n v-3 infrared detector for · pdf filelk21t1 s/n v-3 infrared detector for...

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