User's Manual

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100

GAIN

TARE

INFRARED SENSOR

CI-6628

Instruction Sheet for the

PASCO

Model CI-6628

INFRARED SENSOR

012-06915B

shutter bracket

CI-6628

Infrared Sensor

unit

to computer

interface

cable with DIN

connectors

mounting

thumbscrew

with washer

Introduction

The sensing element used in the PASCO CI-6628

Infrared Sensor is a thermopile. Thermopile

detectors are voltage-generating devices that can

be thought of as a miniature array of

thermocouples. The thermopile is a high output,

thin film, silicon based device which has 48

thermopile junctions. The active or ‘Hot’ junctions

are blackened to efficiently absorb radiation. The

reference or ‘Cold’ junctions are maintained at the

ambient temperature of the detector

The blackening material used on the ‘Hot’

junctions is capable of absorbing radiant energy

from ultra violet to the far infrared. In order to

limit the spectral sensitivity, optical filters and

windows may be placed in front of the detector.

The window installed in the detector is a ruby-

based material which has a spectral response from

visible light to the far infrared (about 40,000 nano-

meters). The hermetically sealed detector is heat

treated and filled with argon gas to improve long

term stability.

The absorption of radiation by the blackened area

causes a rise in temperature in the ‘hot’ junctions as

compared to the ‘cold’ junctions of the thermopile.

This difference in temperature across the

thermocouple junction causes the detector to

generate a positive voltage. If the active or ‘hot’

junction were to cool to a temperature less than the

reference or ‘cold’ junction the voltage output

would be negative.

The output of the thermopile detector is presented

to a gain selectable amplifier. The GAIN switch

located on the top of the sensor is used to adjust the

Summary of content (4 pages)

PAGE 1
012-06915B Instruction Sheet for the PASCO Model CI-6628 INFRARED SENSOR mounting thumbscrew with washer TA R 10 0 1 E GA IN 10 OR NS ED SE AR FR IN cable with DIN connectors to computer interface 8 shutter bracket Introduction The sensing element used in the PASCO CI-6628 Infrared Sensor is a thermopile. Thermopile detectors are voltage-generating devices that can be thought of as a miniature array of thermocouples.
PAGE 2
Infrared Sensor 012-06915B output of the sensor to a level appropriate for the experiment being performed. Gain settings of 1X, 10X and 100X are provided. The gain settings on the sensor coupled with the user selectable gain of the PASCO Computer Interface allow a very broad range of measurements to be made with the Infrared Sensor.
PAGE 3
012-06915B Infrared Sensor Note the orientation of components as illustrated in Tare button alignment hole Adjust the gain for the light conditions 1/4-20 threaded connector 10 10 0 1 TA R E GA IN OR D E AR FR IN S EN S 8 62 I6 Figure 2 Setting the Gain On the Infrared Sensor Figure 4 Mounting connector and alignment hole Figure 3. Mount the shutter bracket to the Infrared Sensor unit, with the included hardware, as shown. Do not over tighten thumbscrew.
PAGE 4
Infrared Sensor 012-06915B 5: power ground 6: +12 VDC power 7: -12 VDC power 8: (no connection) Limited Warranty PASCO scientific warrants the product to be free from defects in materials and workmanship for a period of one year from the date of shipment to the customer. PASCO will repair or replace, at its option, any part of the product which is deemed to be defective in material or workmanship. The warranty does not cover damage to the product caused by abuse or improper use.