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Non-contact thermometer features 35 field of view

Posted: 15 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:non-contact thermometer? sensor? DSP?

Expanding on its automotive family of intelligent infrared, non-contact thermometers, Melexis N.V. has introduced the MLX90614xAC with a narrow field of view (FOV). Current versions of the MLX90614 non-contact temperature sensor have a wide, 90 FOV, targeting air conditioning and room heater applications. The MLX90614xAC has an FOV of only 35. Design engineers can now measure smaller objects or increase the sensor-object distance with this thermometer. 35 was chosen as the minimum FOV achievable without the use of costly infrared optics, while still achieving the accuracy specifications of the original MLX90614.

The 35 FOV of the MLX90614xAC is obtained by adding a viewing angle-limiting metal tube to the standard TO-39 housing of the MLX90614. By calibrating the thermometer after this tube has been attached, the accuracy of the temperature measurements can be maintained.

The sensing element in the MLX90614 is a silicon chip with a thin, micromachined membrane that's sensitive to the infrared radiation of a distant object. A custom signal conditioning chip amplifies and digitizes the signal from the membrane and calculates the object temperature using factory set calibration. The digital output temperature is fully linearized and compensates for ambient temperature variations.

The MLX90614xAC applies LANs, a 17bit ADC and A powerful DSP unit in its signal conditioning chip, allowing a wide operating temperature range of -40C to 125C and an extended object temperature range of -70C to 380C while maintaining a temperature resolution of 0.02C. The MLX90614xAC has a high absolute accuracy of 0.5C in the object temperature range of 0 to 50C and 1C outside that range.

The MLX90614xAC is qualified in accordance to AECQ100 and is ROHS-compatible. It can be soldered up to 260C according to Jedec 020C. Samples of the integrated thermometer are available and production quantities can be ordered with a lead time of eight weeks. The MLX90614xAC is value priced at $7.36 in 1,000 pieces.

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