Infrared sensors are sensors that utilize the physical properties of infrared light to make measurements. Infrared light, also known as infrared light, which has the properties of reflection, refraction, scattering, interference, absorption and so on. Any material, as long as it has a certain temperature above absolute zero, can radiate infrared. Infrared sensors are not in direct contact with the measured object when measuring, so there is no friction, and have the advantages of high sensitivity and fast response.
Infrared sensors used in what place?
1,Flame detector
Flame sensors use infrared light on the flame is very sensitive to the characteristics of the use of special infrared receiver tube to detect the flame, and then the brightness of the flame into a high and low changes in level signals, input to the central processor, the central processor according to the changes in the signal to make the appropriate program processing.
Flame sensor can detect the wavelength of infrared light in the range of 700 nanometers to 1000 nanometers, the detection angle of 60 °, of which the wavelength of infrared light in the vicinity of 880 nanometers when the sensitivity reaches its maximum.
Far-infrared flame probe will be outside the intensity of infrared light changes into the current changes, through the A/D converter is reflected in the range of 0 ~ 255 changes in the value. The stronger the external infrared light, the smaller the value; the weaker the infrared light, the larger the value.
Infrared distance sensor using infrared signals encountered in different distances from the obstacle reflected intensity is also different from the principle of obstacle detection. Infrared ranging sensor has a pair of infrared signal transmitting and receiving diodes, transmitting tube emits a specific frequency of infrared signals, receiving tube to receive this frequency of infrared signals, when the detection direction of infrared encounters obstacles, infrared signals reflected back to be received by the receiving tube, after processing, through the digital sensor interface to return to the central processing unit host, the central processing unit can be used to identify the return of infrared signals to identify the Changes in the surrounding environment.
2, infrared thermometer
The composition of the infrared thermometer is mainly composed of optical systems, modulators, infrared sensor amplifier, indicator and other parts of the composition. Infrared sensor is to receive the target radiation and converted into an electrical signal device.
3, infrared imaging
In many occasions, people not only want to know the average temperature of the surface of the object, but also need to understand the temperature distribution of the object in order to analyze, study the structure of the object, detect internal defects. Infrared imaging will be able to visualize the temperature distribution of the object in the form of images.
Infrared sensor application of attention
Infrared sensor is a very important part of the infrared detection system, but it is very delicate, the use of the infrared sensor may lead to damage if you do not pay attention. Therefore, the infrared sensor should pay attention to the following points in use:
1, must first pay attention to understand the performance indicators and application range of infrared sensors, to master its conditions of use.
2, must pay attention to the working temperature of the sensor, generally to choose the infrared sensor can work at room temperature, easy maintenance.
3, properly adjust the working point of the infrared sensor. In general, the sensor has an optimal working point. Only when working at the optimal operating point, the infrared sensor signal-to-noise ratio is maximum.
4, choose the appropriate preamplifier and infrared sensors to get the best detection results.
5, the modulation frequency and the frequency response of the infrared sensor to match.
6, the optical part of the sensor can not be touched by hand, wipe to prevent damage and staining.
7, the sensor storage attention to moisture, vibration, corrosion.