Infrared sensors are sensors that use the physical properties of infrared rays to make measurements. Infrared, also known as infrared light, has the properties of reflection, refraction, scattering, interference, absorption, etc. Any substance that has a certain temperature above absolute zero can radiate infrared rays. The infrared sensor does not have direct contact with the measured object during measurement, so there is no friction, and it has the advantages of high sensitivity and fast response.
Where are infrared sensors used?
1. Flame detector
The flame sensor uses infrared rays to be very sensitive to flames, uses a special infrared receiver tube to detect flames, and then converts the brightness of the flame into a level signal that changes in height and low and inputs it to the central processing unit, which makes corresponding program processing according to the change of the signal.
Flame sensors can detect infrared light with wavelengths in the range of 700 nm to 1000 nm at an angle of 60°, with the maximum sensitivity of infrared light at wavelengths around 880 nm.
The far-infrared flame probe converts the intensity change of external infrared light into the change of current, which is reflected as the change of the value in the range of 0-255 through the A/D converter. The stronger the external infrared light, the smaller the value; The weaker the infrared light, the greater the value.
The infrared distance sensor uses the principle that the infrared signal encounters the distance of the obstacle and the intensity of the reflection is also different, and the distance of the obstacle is detected. The infrared ranging sensor has a pair of infrared signal transmitting and receiving diodes, the transmitter emits an infrared signal of a specific frequency, the receiving tube receives the infrared signal of this frequency, when the detection direction of the infrared encounters an obstacle, the infrared signal is reflected back and is received by the receiving tube, after processing, it is returned to the central processing unit host through the digital sensor interface, and the central processing unit can use the return signal of the infrared to identify the change of the surrounding environment.
2. Infrared thermometer
The composition of infrared thermometer is mainly composed of optical system, modulator, infrared sensor amplifier, indicator and other parts. An infrared sensor is a device that receives radiation from a target and converts it into an electrical signal. [1]
3. Infrared imaging
In many cases, it is necessary to know not only the average temperature of the surface of an object, but also the temperature distribution of the object in order to analyze, study the structure of the object, and detect internal defects. Infrared imaging visualizes the temperature distribution of an object in the form of an image.
Attention to the application of infrared sensors
The infrared sensor is a very important part of the infrared detection system, but it is very squeamish, and if you are not careful in use, it may cause damage to the infrared sensor. Therefore, the following points should be paid attention to in the use of infrared sensors:
1. We must first pay attention to understand the performance indicators and application scope of the infrared sensor, and master its use conditions.
2. It is necessary to pay attention to the working temperature of the sensor, and generally choose an infrared sensor that can work at room temperature for easy maintenance.
3. Adjust the working point of the infrared sensor appropriately. In general, there is an optimal operating point for the sensor. The signal-to-noise ratio of the infrared sensor is greatest only when operating at the optimal operating point.
4. Select the appropriate preamplifier to cooperate with the infrared sensor to obtain the best detection effect.
5. The modulation frequency matches the frequency response of the infrared sensor.
6. The optical part of the sensor should not be touched or rubbed by hand to prevent damage and staining.
7. Pay attention to moisture-proof, anti-vibration and anti-corrosion when storing the sensor.
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