High Operating Temperature Thermal Sensor ArrayFebruary 07, 2019 by Paul Shepard
Melexis announced a new version of its popular far infrared (FIR) thermal sensor array. The new device has lower thermal noise compared to the current MLX90640, an increased refresh rate of 64Hz and an elevated operating temperature up to 125°C.
The extended temperature range opens up multiple new applications and the new MLX90641 is expected to be particularly suited to applications in the world of cooking, such as conventional and microwave ovens as well as industrial applications such as detection of power electronics overheating and automotive systems.
This latest sensing technology allows for simplified integration of temperature measurement into applications that enhance safety, efficiency, convenience - especially in harsh thermal conditions.
The new MLX90641 is a small 16 x 12 pixel IR array housed in an industry standard 4-lead TO39 package that is able to accurately measure temperatures in the range -40°C to +300°C. The factory-calibrated devices ensure an accuracy of 1°C in typical measurement conditions. The high accuracy is further supported by a Noise Equivalent Temperature Difference (NETD) of 0.1 K RMS.
Two different field of view (FoV) options are available, a standard 55° x 35° and a wide angle 110° x 75°. The device is simple to use, operating from a single 3.3V supply and storing all results in internal RAM for access via an I2C compatible digital interface. A proprietary algorithm ensures high thermal stability, even in conditions where the temperature is changing rapidly.
The MLX90641 offers 192 FIR pixels, allowing for less powerful processors to be used, contributing to lower system overhead. Additionally, no re-calibration is required thereby reducing further operational expenses.
To speed up application development, Melexis has made MCU driver software available via the github.com platform and additional software is available for the detection of people via their thermal signature.
Commenting on the new product release Joris Roels, Marketing Manager Temperature Sensors said: "The extended temperature range and enhanced thermal stability make this new device even more versatile than earlier devices. With this new technology, we meet our customers' needs for accurate temperature sensing in even more challenging thermal conditions."