23

24

25

26

27

28

NETD Example

x Given a staring uncooled IR imager operating in 8-12 Pm

band, with 50 Pm detectors, F/1 optics, 30 Hz bandwidth.

x Let us say the NETD spec is 50 mK – what D* does this

correspond to?

x Starting with

dADTL

fFNETD

)/#(4

*

2

ww

'¸¹·

¨©§S

x Evaluate change in radiance per unit temperature,

integrated over passband

³ u|Ow Ow

ww P

P�m

m KSrcmWatt

TKTL

TL 12

8 2

5106.7d

)300,(

x Find integrated in-band D* is | 4 u 108 cm Hz

1/2 Watt

���

29

30

31

36

Infrared Systems Design – References

x Dereniak & Boreman, Infrared Detectors & Systems, Wiley, 1996.

x Dereniak & Crowe, Optical Radiation Detectors, Wiley, 1984.

x Hudson, Infrared Systems Engineering, Wiley, 1969.

x Lloyd, Thermal Imaging Systems, Plenum, 1975.

x Seyrafi, Electro-Optical Systems Analysis, EORC, 1985.

x Spiro & Schlessinger, Infrared Technology Fundamentals, Dekker,

1989.

x Wolfe & Zissis, The Infrared Handbook, ERIM/SPIE, 1990.