The infrared beams sensor manufacturer tells you that an infrared (IR) sensor is an electronic device that can measure and detect infrared radiation in its surrounding environment. In 1800, an astronomer named William Herchel accidentally discovered infrared radiation. When measuring the temperature of each color of light (separated by a prism), he noticed that the highest temperature just exceeded the red light. The infrared beams sensor manufacturer tells you that the human eye cannot see infrared because the wavelength of infrared is longer than that of visible light (although it is still in the same electromagnetic spectrum). Anything that emits heat (anything whose temperature exceeds 5 degrees Kelvin) emits infrared light.

Except for the coldest objects, all objects emit electromagnetic radiation in the form of heat, which can be detected by infrared sensors.

The manufacturer of infrared beams sensor tells you that there are two types of infrared sensors: active and passive. Active infrared sensors both emit and detect infrared radiation. Active infrared sensors are divided into two parts: light-emitting diodes (LED) and receivers. When an object approaches the sensor, the infrared light from the LED will reflect off the object and be detected by the receiver.

Active infrared sensor: The infrared beams sensor manufacturer tells you to put a pair of infrared emitting and infrared receiving devices together to form an infrared through-beam system. Such a system is defined as an active infrared sensor.

The infrared beams sensor manufacturer tells you that active infrared infrared sensors can be divided into four types: single beam, double beam, three beam and four beam. Depending on the type of the installation location of the infrared transmitter and the receiver, they can be installed in an atmosphere-oriented installation mode and a reflective installation. Reflective installation only receives the infrared rays reflected by the reflector or reflector as a signal, but does not directly receive the infrared rays emitted by the transmitter. The infrared beams sensor manufacturer tells you that if the position or direction of the reflecting surface changes due to some reasons, or if one of the infrared rays emitted by the transmitter and the reflected beam are blocked, there is no gap between the transmitter and the receiver. Signal exchange, that is, the receiver cannot receive the signal, so that the signal cannot be output in time.

The infrared beams sensor manufacturer tells you that the passive infrared (PIR) sensor only detects infrared radiation and does not emit radiation from the LED. Passive infrared sensors include: two pyroelectric materials (a pyroelectric sensor), infrared filter (can block all other wavelengths of light), Fresnel lens (can collect light from multiple angles to one point Middle), housing unit (used to protect the sensor from other environmental variables (such as humidity)).

The infrared beams sensor manufacturer tells you that it is mainly composed of thermal sensors, optical systems and other parts. The infrared sensor is the core part of this detection device, because of the coordination of the optical system, it is very easy to detect the change of thermal radiation in a fixed three-dimensional space.