Introduction to Infrared Ray

Infrared is electromagnetic waves of wavelengths between microwave and visible light, ranging from 1mm to 760 nm, that are non-visible than red light. Infrared ray is an electromagnetic wave with a wavelength between microwave and visible light. Its wavelength ranges from 750 nanometers to 1 mm. It is non-visible light with a wavelength longer than red light. Covering bands of thermal radiation emitted by objects at room temperature. It can penetrate clouds better than visible light and has a wide range of applications in communication, detection, medical and military applications.

Anything above absolute zero (-273.15℃) can produce infrared. Modern physics calls this heat ray. Medical infrared can be divided into two categories: near infrared and far infrared. Containing heat, the sun's heat is transmitted to the Earth mainly by infrared rays.

Infrared optoelectric switch

Introduction to infrared optoelectronic switch

Infrared photoelectric switch USES near-infrared and infrared which are invisible to human eyes (wavelength is 780nm-1mm) to detect and distinguish objects. A faint beam of light emitted instantaneously by an electro-optical device can be transmitted and received safely, reliably and accurately.

The important role of the infrared photoelectric switch is to be able to process the change of light intensity: the use of optical elements, in the middle of the propagation medium to change the beam, the use of the beam to reflect the object, so that the beam emitted after a long distance instantaneous return. Infrared photoelectric switch is composed of transmitter, receiver and detection circuit. The transmitter aims at the target and emits a beam of light, which generally comes from LED and laser diode. The beam is emitted continuously, or changes the pulse width. The radiation intensity of the pulsed modulated beam is selected several times in the transmitting process and runs towards the target indirectly. The receiver consists of a photodiode or phototransistor. In front of the receiver are optical elements such as lenses and apertures. Behind it is the detection circuit, which can filter out the effective signal and apply the signal.

According to the transmission mode of infrared light, the infrared optoelectronic switch can be divided into infrared counter mode and infrared reflection mode. According to infrared light detection, there are AD sampling and square wave modulation.