Senba Sensing Technology Co., Ltd.

  Infrared sensor system includes optical system, detection element and conversion circuit optical system. The working principle of the infrared thermopile  sensor system is not complicated. The entities of each part of a typical sensor system are:   1. Target to be tested   The infrared system can be set according to the infrared radiation characteristics of the target to be measured.   2. Atmospheric attenuation   When the infrared radiation of the measuring target passes through the earth's atmosphere, the infrared radiation emitted by the infrared source will attenuate due to the scattering and absorption of gas molecules, various gases and various sol particles.   3. Optical receiver   It receives part of the infrared radiation of the target and transmits it to the infrared sensor, which is equivalent to radar antenna, commonly used as objective lens.   4. Radiation modulator   The radiant light from the target under test is modulat...

  The main parameters and characteristics of  photosensitive resistance are as follows:   1. Bright resistance in the photocurrent state   Under a certain applied voltage, the current flowing through the photoresistor when light is irradiated is called the photocurrent, and the ratio of the applied voltage to the photocurrent is called the light sensor resistor , which is usually expressed as "100LX".   2. Dark resistance under dark current state   Under a certain applied voltage, the current flowing through the photoresistor when there is no light is called dark current. The ratio of the applied voltage to the dark current is called the dark resistance, which is usually expressed as "0LX".   3. Sensitivity   Sensitivity refers to the relative change value of the dark resistance when the photoresistor is not irradiated by light and the light resistance when irradiated by light.   4. Illumination characteristics of photoresistor   The rel...

  In the laser infrared alarm, there is a photoresistor. What is it? How does a photoresistor work?   Photoresistor, also known as photoconductor, is made of special materials. Photoresistor is a special resistor made of semiconductor materials such as cadmium sulfide or cadmium selenide. Its surface is also coated with moisture-proof resin, which has photoconductive effect.   These materials have the following characteristics: Under normal conditions, they have a large resistance value. Under the irradiation of a certain frequency of light, the resistance value will rapidly decrease, so that the voltage at both ends will be reduced.   The working principle: The working principle of photoresistor  is based on the internal photoelectric effect, that is, the electrode lead is installed on both ends of the semiconductor photosensitive material and encapsulated in the shell with a transparent window to form the photosensitive resistance.   The photoresistor is ...

  Thermopile is a kind of thermoluminescence infrared sensor, which is a device composed of thermocouple. It has been widely used as a temperature detection device in ear thermometer, radiation thermometer, electric oven, food temperature detection and other fields. So, how does a thermopile sensor work? Let's answer this question.   As long as any object is above absolute zero, it will radiate energy at a certain wavelength, but the radiation energy at low temperature is very weak. At room temperature, all objects in nature are the emission source of infrared radiation, but the wavelength of infrared radiation is different.   The principle of thermopile temperature sensor is based on Seebeck effect: a closed circuit composed of two conductive materials with different work function. When the temperature at the two contact points is different, the carriers inside the material move towards the lower temperature end due to the decrease of temperature gradient, and the accumu...

  Digital PIR sensor is a new type of electronic weighing sensor developed on the basis of traditional resistance strain sensor, combined with modern microelectronics technology and microcomputer technology integration. Its advantages are as follows:   1. Solve the problem of poor signal of analog sensor:   The output signal of digital PIR sensor  is about 3 ～ 4 V, and its anti-interference ability is much more than millions of analog signal.   2. Solve the problem of radio frequency interference:   In the design of digital infrared sensors, the anti-interference ability has been considered. They can be in the high interference area and ensure the measurement performance.   3. Solve the problem of moisture-proof and anti-corrosion:   The digital infrared sensor adopts 100% stainless steel welding shell.   4. Solve the problem of lightning protection, off-load and temperature influence:   The digital infrared sensor has the ability of lig...

  Linear light sensor is also called phototransistor. The integrated chip is very sensitive to light changes. Therefore, it is usually used to detect the current ambient light level and convert the light energy into electrical signal output. It can be used as follows:   1. The use of linear light sensor: object detection Black, white and grayscale can be determined by sending a beam of light to the object to be measured and accepting the reflected light with a linear light sensor. The color of an object can also be detected by using different emitting wavelengths of luminophore (light emitting diodes in usual) and linear light sensors sensitive to different wavelengths. In this way, the optical signal is converted into electrical signal, and then a series of processing is carried out. The common "automatic tracking car" uses linear light sensor to detect the black line on the ground.   2. The use of linear light sensor: optical coupling (opto-couple) Optocoupler is an ele...