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PIREPlus High-Output Emitter
Jan 2010
Cal Sensors Inc. (See Opto Diode Corporation)
SANTA ROSA, Calif., Jan. 25, 2010 – Cal Sensors announces the launch of PIREPlus, a high-output, high-pulse-rate emitter that can be pulsed as a source of blackbody radiation for near- to far-infrared applications at 180 Hz with 50% modulation depth. With a pulsing speed that the company says is 18 times faster than alternative technologies offer, it enables users to obtain accurate readings of materials and trace gases with very low parts-per-million concentrations. The solid-state emitter maximizes signal-to-noise performance, expanding the measurement dynamic range and resolution. It produces output of 4 × 10–2 W/cm2 at 1 in. from the filament and includes integrated drive electronics in an industry-standard 14-pin DIP integrated circuit package.

The device is suitable for use in a variety of applications, including industrial and medical gas analysis, environmental monitoring, process control instrumentation, spectroscopy and plastics sorting. The pulsable emitter is compatible with a wide range of detector technologies and is supplied in an industry-standard T0-5 header package.

It provides high pulse speed without requiring the added expense of built-in optical choppers or mechanical modulators as incandescent bulb emitters often do, and it covers a wider spectrum than do high-pulsing infrared LEDs that focus only on very narrow bandwidths.

The radiating element is an ultrathin metallic foil configured to ensure that radiation from both sides of the heated foil is efficiently directed out of the package along the optic axis. The foil material has an emissivity of 0.88 and closely emulates a blackbody source in spectral distribution. The emitter is designed to operate at a rated maximum foil temperature of 1000 K and is offered with a standard integrated reflector to provide near-collimated and uniform radiation output. A variety of elliptical reflectors with varying focal lengths are available for coupling into optical fibers and other applications.

The drive electronics are voltage-variable and allow users to select from a variety of frequencies between 1 and 500 Hz, according to their specific application needs. A special feature is the ability to provide peak pulse temperatures independent of the pulse frequency, ensuring high output for any application.

Compatible with a variety of infrared detector technologies, the emitter can be paired with the company’s new MIRA4 four-color lead selenide sensor that provides sensitivity of 1.5 E10 Jones in the detection of up to four distinct gases in the 1.0- to 5.5-µm infrared region. The emitter and detector can be purchased together as an integrated module for quick integration and efficient design and performance.

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