Cognex Corporation
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DR34 - Compensated Thin-Film Thermopile Detector
Dexter's DR34 is a thin-film thermopile detector that comes in a TO-5 package. It is a dual channel device having a two-channel or one-channel design that delivers low noise output.
The dimensions of each active area are 3.16mm x 0.4mm. The channel-to-channel crosstalk is minimized using an internal aperture, thereby improving the device’s sensitivity.
Benefits
The main benefits of the Dexter's DR34 thermopile detector include:
Dual channel design
Low noise
High sensitivity
Reduced channel-to-channel crosstalk
Applications
The major applications of the Dexter's DR34 thermopile detector include:
Analysis of environmental air quality including greenhouse gases
Industrial and medical monitoring including infant incubators
Automotive gas analysis
Technical Specifications
The technical specifications of the DR34 thermopile detector are summarized in the following table:
| Parameter | Min | Typical | Max | Symbol | Units | Comments |
|---|---|---|---|---|---|---|
| Active Area size | 3.16 x .4 | AA | mm | Hot junction size, per element. | ||
| Element Area | 1.264 | A | mm2 | |||
| Number of Junctions | 40 | Per element. | ||||
| Number of Channels | 2 | Per detector package. | ||||
| Output Voltage | 90 | 115 | 130 | Vs | μV | DC, H=330μW/cm2 (3) |
| Signal-to-Noise Ratio | 6,429 | 10,088 | 16,049 | SNR | √Hz | DC, SNR=Vs/Vn |
| Responsivity | 21.6 | 27.6 | 31.2 | ℜ | V/W | DC, ℜ=Vs/HA (2) |
| Resistance | 4.0 | 8.0 | 12 | R | kΩ | Detector element |
| Temperature Coefficient of ℜ | -.36 | %/°C | Best linear fit, 0° to 85°C (1) | |||
| Temperature Coefficient of R | .2 | %/°C | Best fit, 0° to 85°C (1) | |||
| Noise Voltage | 8.1 | 11.4 | 14.3 | Vn | nV/√Hz | Vn 2=4kTR |
| Noise Equivalent Power | .26 | .42 | .65 | NEP | nW/√Hz | DC, NEP= Vn HA/Vs (2) |
| Detectivity | 1.7 | 2.7 | 4.3 | D* | 108cm√Hz/W | DC, D*=Vs/ Vn H√A (2) |
| Time Constant | 38 | ℑ | ms | Chopped, -3dB point (1) | ||
| Field of View | NA | FOV | Degrees | Not Applicable | ||
| Package Type | TO-5 with 5 Pins | Standard package hole size: Φ.180” | ||||
| Element Matching | 5 | 10 | M | % | M =|VA-VB|/VB (2) | |
| Element Separation | 1.8 | mm | Center to Center | |||
| Operating Temperature | -50 | 100 | Ta | °C | ||
General Specifications: Flat spectral response from 100nm to > 100µm. Linear signal output from 10-6 to 0.1W/cm2. Maximum incident radiance 0.1W/cm2, damage threshold ≥ .5W/cm2
Notes: (1) Parameter is not 100% tested. 90% of all units meet these specifications. (2) A is detector area in cm2. (3) Test Conditions: 500K Blackbody source; Detector active surface 10cm from 0.6513cm Diameter Blackbody Aperture.
General Specifications
The general specifications of the DR34 thermopile detector include:
Flat spectral response from 100nm to > 100µm
Linear signal output from 10-6 to 0.1W/cm2
Maximum incident radiance is 0.1W/cm2
Damage threshold is ≥ 0.5W/cm2
Notes
Specifications apply at 23°C with KBr window and nitrogen encapsulating gas
Parameter is not 100% tested. 90% of all units meet these specifications.
A is detector area in cm2.
Test conditions: 500K blackbody source; detector active surface 10cm from 0.6513cm diameter blackbody aperture.
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