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   INFRARED PHOTO
   DETECTORS

   GENERAL PARAMETERS
   PbSe INFRARED DETECTORS
   UNCOOLED

   PbSe INFRARED DETECTORS
   COOLED

   INTERFERENCE FILTERS

   LIGHT EMITTING DIODES

   GENERAL PARAMETERS
       LE-34
       LE-42


Uncooled PbSe infrared photoconductive detectors

Uncooled PbSe infrared photoconductive detectors, based on thin films of PbSe and alloys of A4B6 semiconductor materials, are basic intend for application in analytic technique for gas and liquid analysis, but also are widely used for flame detection and some special applications, etc. We are using a unique dry "physical" method of manufacturing of such detectors and our product is characterized by specifically high sensitivity in range of 3...4 microns in comparison to photo detectors manufactured by other methods. It is also important that they are working at lower supply voltage.

Our uncooled photoresistors are manufactured in house TO-18 (size of sensitive square is 1,5 x 1,5mm) and TO-5 (size 2 x 2mm). For the window of the house, depending on the task, we are using either silicon with AR coating, or IR quarts. We are also manufacturing photo detectors with one or two sensitive elements, and with assembled interference filters.

Basic advantages of uncooled photo detectors are:

- small size;
- high speed of response;
- low power consumption;
- low costs;



PHOTOCONDUCTIVE DETECTOR TYPE

PARAMETER

UNITS

PR1-28

PR1-34

PR1-38

Wavelength of max response (25oC)

µm

2.8+/-0.2

3.4+/-0.2

3.8+/-0.2

Spectral range (25oC)

µm

1.0...3.5

1.0...4.0

1.0...4.5

min

typ

max

min

typ

max

min

typ

max

Time constant τ (25oC)

μsec

40

50

70

20

30

50

5

8

10

Dark Resistance R (25oC)

KOhm

50

500

20

250

20

200

Responsivity Su (*)peak, 573K)

V/W

30000

40000

15000

25000

8000

12000

Detectivity D* (573, 800, 1)

cmHz1/2W-1

1*109

1.8*109

8*108

1.5*109

7*108

1.5*109

Peak Detectivity D* (λpeak)

cmHz1/2W-1

2.2*1010

4*1010

8*109

1.5*1010

3.5*109

5*109

Power supply

V

3 (1.5x1.5mm); 5 (2x2mm); 10 (3x3mm) (in brackets: size of sensitive element)

Operation Temperature Range

oC

-40...+50

Storage Temperature Range

oC

-40...+60

(*) - 1x1mm size of sensitive element




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