photoelectric sensor
A photoelectric sensor is a device that converts light signals into electrical signals. Its working principle is based on the photoelectric effect. The photoelectric effect refers to the phenomenon where, when light shines on certain materials, the electrons in the material absorb the energy of the photons, resulting in a corresponding electrical effect. Based on different phenomena, the photoelectric effect is divided into three categories: external photoelectric effect, internal photoelectric effect, and photovoltaic effect.
Infrared sensor
Infrared sensors are sensors that utilize infrared light for data processing. They offer advantages such as high sensitivity and can control the operation of drive devices. Infrared sensors are commonly used for non-contact temperature measurement, gas composition analysis, and non-destructive testing, finding wide application in medicine, military, space technology, and environmental engineering. For example, using infrared sensors to remotely measure the thermal image of the human body surface temperature can identify areas of abnormal temperature.
The difference between photoelectric sensors and infrared sensors
1. The principle of photoelectric sensors is to convert light signals into electrical signals by using elements that are sensitive to light signals.
2. The function of a sensor is to convert one signal mode into another. For example, a pressure sensor converts pressure into an electrical signal. Similarly, infrared sensors and photoelectric sensors convert infrared and light signals into electrical signals.
3. Infrared sensors are a type of photoelectric sensor. The light in photoelectric sensors refers to infrared, visible light, and ultraviolet light, all of which are electromagnetic waves. The difference lies in their wavelengths. Infrared light is an electromagnetic wave with a wavelength of 0.76um to 1000um, visible light has a wavelength range of 0.14um to 0.76um, and ultraviolet light has a wavelength of less than 0.14um.
