The infrared emission tube is composed of an infrared light emitting diode, and the PN junction is made of a material with high infrared radiation efficiency (usually using gallium arsenide), and a forward bias is injected into the PN junction to inject a current to excite infrared light, and the spectral power distribution is a central wavelength of 830~ 950nm. The performance of a light emitting diode is a positive temperature coefficient. The higher the current, the higher the temperature, and the higher the temperature, the higher the current. The power of an LED infrared diode is related to the magnitude of the current. However, when the forward current exceeds the maximum value, the infrared diode emission power is lowered. The infrared emission tube does not directly contact the object to be measured during the measurement process, so there is no friction, and the advantage is high sensitivity and fast response.
Infrared emission tube
The infrared emission tube includes an optical system, a detecting element, and a conversion circuit。 According to the structure, the optical system can be classified into two types, a transmissive type and a reflective type。 According to the working principle, the detecting elements can be divided into a heat detecting element and a photoelectric detecting element。
The widely used thermal sensor is a thermistor。 When the thermistor is illuminated by the infrared LED, the temperature rises, the resistance changes, and the electrical signal is output through the conversion circuit。 Photoelectric detection elements are commonly used as photosensitive elements, usually made of lead sulfide, lead selenide, indium arsenide, antimony arsenide, cadmium telluride ternary alloy, germanium and silicon doping。
Infrared emitters are commonly used in non-contact temperature measurement, gas composition analysis and non-destructive testing, and are widely used in medical, military, space technology and environmental engineering fields。 For example, it can be used to measure the temperature of the human body surface at a long distance, to find the location of abnormal temperature, and to diagnose it in time; it can be used for monitoring the Earth's clouds on artificial satellites, and can realize a wide range of weather forecast; it can be used to detect the operation on the aircraft。 Overheating of the engine, etc。
For more information on infrared emission tubes, please visit Shenzhen Chengguangxing official website http://www.pinchedi.com/.