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Infrared Detector Lines
Jan 2011
Cal Sensors Inc. (See Opto Diode Corporation)
SANTA ROSA, Calif., Jan. 31, 2011 — Cal Sensors has launched two lines of lead-sulphur (PbS) infrared detectors and a digital drive board. The single-channel detector (SCD) and multichannel detector (MCD) product lines provide high sensitivity for a variety of infrared sensing applications. The digital drive board optimizes detector performance and speeds product development processes.

The SCD-13HV (high value) PbS detectors meet requirements for high volume, cost-sensitive applications. Proprietary process controls and automated production equipment result in high repeatability and good product consistency. Applications include fire safety and flame detection, and process and quality control.

SCD detectors operate across the 1- to 3-µm wavelength range. Performance varies with element size and window type.

All SCD-13HV products support a glass window or lens configuration. Three element sizes are available in industry-standard packages for easy integration. For applications where size is critical, such as portable test equipment, they offer a 1 × 1-mm detector in a TO-46 can. Where greater field of view or larger element sizes are important, 2- and 3-mm-square detector sizes are available in TO-5 packages.

The PbS and lead-selenium (PbSe) multichannel detectors provide high sensitivity for detection of up to four distinct materials/gases. Covering the 1- to 5-µm range, they provide channel isolation of >99.5% and a compact TO-5 footprint.

An optional integrated thermistor within the MCD package optimizes temperature compensation and maximizes measurement precision. Co-locating the temperature sensor and detector material in a hermetically sealed TO-5 package ensures that they both sense the same temperature variations and reduces effects of external environmental factors.

The four-channel configuration reduces cost and simplifies design, minimizing the need for multiple individual detectors and complex optics. System costs and footprints can be reduced by up to 60% versus alternative single-detector designs, according to the company.

The technology is suited to industrial and medical gas analysis, auto and aviation emissions testing, and environmental applications such as stack monitoring, greenhouse gas analysis and overseeing air quality in confined spaces such as tunnels and underground structures.

Though customizable for applications across the 1- to 5-µm infrared spectrum, the MCD-15 line is available in a standard four-channel configuration with four discrete optical bandpass filters. This configuration supports CO, CO2, and hydrocarbon (such as methane) gas analysis. Custom filters are available to meet specific application requirements.

The digital drive board optimizes signal levels for the company’s one- to four-channel detectors. Designed with a socket that accepts proprietary standard one- to four-channel detectors, it provides all electronics necessary to drive the sensor, digitize the output and connect via USB to a computer or microprocessor. Engineers can focus on the challenges of the system’s design by quickly validating detector viability. Supporting PbS and PbSe detector technologies, these drive boards were created to accelerate prototyping and product development.

process control
The collection and analysis of data relevant to monitoring the rate and quality of industrial production, either continuously or in batches. Corrections can be made manually or automatically, via a feedback control loop.
A solid-state semiconducting structure (basically one of the bolometers) that changes electrical resistance with temperature. Materially, some kind of ceramic composition is used. A thermistor has much higher electrical resistance than metallic bolometers and hence requires much higher voltages to become useful.
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