+1 (734) 426-3921
Questions about Dexter detectors? Call today. Outside the U.S., contact the representative nearest you.

ST120 Dual

ST120 Dual Detector circuit overlay
ST120 Dual Detector circuit overlay
ST120 Dual Thermopile Detector
ST120 Dual Thermopile Detector

Silicon Based Thermopile Detector

Features:
A two-channel silicon-based thermopile in a TO-5 package. Each small active area is 1.2mm x 1.2mm . Time constant of 25ms with Nitrogen encapsulation gas. Delivers a very low Temperature Coefficient of Responsivity of -0.04%/°C. This detector has a very short thermal shock response to ambient temperature change.
Applications:
Excellent for gas analysis, fire suppression, non-contact temperature, and horizon sensor .
Benefit:
Low cost with high output.
Options:
  1. See Standard Windows and Filters (PDF) for list of optical filter options.
  2. Internal 30kΩ 5% NTC chip thermistor provides ambient package temperature measurement. See DC-4005 section of Thermistor Options (PDF).
  3. Internal aperture precisely defines active area for applications with FOV and/or spot size requirements. See Aperture Options (PDF) for available sizes.
  4. See Thermopile Configuration Table for more options.
Datasheet:
For more detailed information see the datasheet
ST120_Dual (PDF)
Parameter
Min
Typical
Max
Symbol
Units
Comments

Active Area size

1.2 x 1.2

AA

mm

Hot junction size, per element.

Element Area

1.44

A

mm2

  

Number of Junctions

80

 

 

Per element.

Number of Channels

2

 

 

Per detector package.

Output Voltage

 

165

 

Vs

μV

DC,  H=330μW/cm2 (3)

Signal-to-Noise Ratio

 

4,301

 

SNR

√Hz

DC, SNR=Vs/Vn

Responsivity

 

34.7

 

V/W

DC, =Vs/HA  (2)

Resistance

 

90

 

R

kΩ

Detector element

Temperature Coefficient of

 

-.04

 

 

%/°C

Best linear fit, 0° to 85°C (1)

Temperature Coefficient of  R

 

.02

 

 

%/°C

Best fit, 0° to 85°C (1)

Noise Voltage

 

38.4

 

Vn

nV/√Hz

Vn2=4kTR

Noise Equivalent Power

 

1.10

 

NEP

nW/√Hz

DC,  NEP= VnHA/Vs (2)

Detectivity

 

1.09

 

D*

108√Hz/W

DC,  D*=Vs/ VnH√A  (2)

Time Constant

 

25

 

Τ

ms

Chopped, -3dB point (1)

Field of View

27°/77°

FOV

Degrees

See Assembly Drawings for FOV Description.

Package Type

TO-5

    

Standard package hole size: Ø.150"

Element Matching

 

25

 

M

%

M=|VA-VB|/VB (2)

Element Separation

 

3.30

 

 

mm

Center to Center

Operating Temperature

-50

 

125

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.