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Infrared Source IR-20 Series

IR-21 Features

 This infrared light source is a thermal emitter with an emissivity of ~80%. It is appropriate for use in laboratory or field instrumentation due to its long life and stable properties.

IR-21V Powered The coiled filament operates at ~800°C when powered with 4 watts for the IR-21 and 3.4 watts for the IR-22. The radiating element is a coiled resistance wire which has a high emissivity in the infrared spectral region. The coil is supported on a cylindrical substrate of alumina. Due to the reduced mass of this unit it can be pulsed at up to 1 hertz with a resultant temperature variation that can be detected though the depth of modulation is small. For better pulsed infrared light source operation please see the IR-40 and IR-50 sources. The unit does not require operation in a sealed atmosphere.

 The header is available in two sizes. The larger, IR-21, has an 8.6 mm diameter base. The smaller, IR-22, has a 4 mm diameter base. The support pins, which are also the power leads, are hermetically sealed in glass.

 The IR-20 Series is offered in two configurations: the IR-21 and IR-22 have the element mounted horizontally and the IR-21V and IR-22V which have the element mounted vertically.

IR-21 PoweredOperating Specifications IR-21 and IR-21V

Voltage: 5 Volts (AC or DC)

Temperature: 800°C

Current: 0.8 Amps

Power: 4.0 Watts

Active area: 1.5 mm x 3.5 mm

Emissivity: 0.80

Lifetime: 3+ years at 800°C, typical

Dimensions

IR-21 Dimensions

Temperature vs Voltage

IR-21 & IR-21V Temperature vs Voltage

Current vs Voltage

IR-21 & IR-21V Current vs Voltage

Power vs Voltage

IR-21 & IR-21V Power vs Voltage

Operating Specifications IR-22 and IR-22V

Voltage: 4.5 Volts (AC or DC)

Temperature: 800°C

Current: 0.75 Amps

Power: 3.4 Watts

Active area: 1.5 mm x 3.5 mm

Emissivity: 0.80

Lifetime: 3+ years at 800°C, typical

Dimensions

IR-21 Dimensions

Temperature vs Voltage

IR-21 & IR-21V Temperature vs Voltage

Current vs Voltage

IR-21 & IR-21V Current vs Voltage

Power vs Voltage

IR-21 & IR-21V Power vs Voltage

Spectral Radiance

Blackbody Spectral Radiance Spectral radiance output for a perfect black body of various temperatures. The IR-21, IR-21V, IR-22 and IR-22V produces approximately 80% of these figures in the 1µm to 22µm range.

Ordering Information

IR-21

 4 Watt Infrared Source - Horizontal Element - Large Base

 

IR-21V

 4 Watt Infrared Source - Vertical Element - Large Base

 

IR-22

 3.4 Watt Infrared Source - Horizontal Element - Small Base

 

IR-22V

 3,4 Watt Infrared Source - Vertical Element - Small Base

 

Accessories

MC-233

 Elliptical Reflector (IR-12, IR-12K, IR-21)

MC-233V

 Elliptical Reflector (IR-12, IR-12K, IR-21, IR-21V)

MC-234

 Parabolic Reflector (IR-12, IR-12K, IR-21)

MC-234V

 Parabolic Reflector (IR-12, IR-12K, IR-21, IR-21V)

 The combination of the IR-21V and the MC-233V Elliptical reflector creates an output image as shown below. The majority of optical output is concentrated within an approx 3mm circle 12mm from reflector. Please note, the infrared output is just strong enough to char paper and that the shadow cast from the element support can be seen.

IR21V + MC233 Output IR21V + MC233 Burn Diagram

 By using an IR-21V, an MC-233V elliptical reflector and a piece of fax paper, it is possible to monitor how quickly the IR-21V heats up. Full power is reached approximately 15 seconds from switch on, though the infrared output continues to increase as the reflector heats up. (Approx 2.5 second exposure at each point)

IR21V+ MC233 warm up burn diagram

Useful Documents

pdf

Infrared Source Series 20 Data Sheet - pdf (27K)

   

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