New Outdoor Solution - Chalcogenide-based LWP Filter Coating

As a key component of thermal imager, infrared sensor can perceive infrared signals and convert them into electronic signals. However, when we use the thermal imager outdoors, 1~7μm infrared in the sunlight will have a certain interference and influence on the signal of infrared sensor, thereby reducing the accuracy and reliability of detection, and even damaging the sensor. Specifically, 1~7μm infrared in this kind of environment will change the intensity and frequency of the infrared signal received by the infrared sensor, resulting in distortion or misjudgment of the output signal, which will adversely affect the automatic control system.

For infrared thermal imagers that need to work in direct sunlight, optical reflection technology can be used to effectively reflect 1~7μm infrared in sunlight, so as to achieve accurate load reduction and performance improvement of the sensor. Sunny Infrared Optical coating team successfully developed the infrared short-wave cut-off filter coating on the chalcogenide-based, which is conducive to improve effective wavelength transmission, cut off harmful wavelengths transmission, achieve excellent filtering effect, and greatly improve the measurement accuracy and performance of the thermal imager.

Precise transmittance control for two different wavelengths.

LWP filter coating can achieve low transmittance (Tave<2%) in the wavelength of 1-6.6μm and high transmittance (Tave >93%) in the wavelength of 7.5-14um.

Widely used and reliable.

LWP filter coating can be widely used on the different lens surface types such as plane, spherical and aspherical surfaces, and the optical performance is stable. After a series of environmental test, such as adhesion, moderate abrasion, temperature and humidity, temperature cycle, salt spray, chemical resistance, as well as strict testing by domestic and foreign customers, the coating has a high performance in reliability. It is now on mass production stage, and widely used in different industries, like temperature measurement, human body temperature measurement, security monitoring, outdoor sports and so on.