Posted in | Thermocouples

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 V/W DC, ℜ=Vs/HA (2)
Resistance 4.0 8.0 12 R 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   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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