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What is ir sensor? Principle of operation and related modules ? Associated price?

What is ir sensor? Principle of operation and related modules ? Associated price?

August 08 , 2023 0

ir sensor It is a sensor that utilizes infrared light for data processing, which has the advantage of high sensitivity, and the ir sensor can also control the operation of the drive unit.ir sensors are commonly used for non-contact temperature measurement, gas composition analysis and non-destructive flaw detection, and are widely used in fields such as medicine, military, space technology and environmental engineering. For example, the use of ir sensors to measure the temperature of the human body surface at a distance thermograms, can be found in the parts of the temperature anomaly.Joinwinchips Your Effective Assistant of the Components Sourcing. Highlights: Purchase Guide Available, Fast Delivery Available, Multiple Payment Options Available。Free Samples。Fast deliver

offer ir sensor price.

Ir Sensor Basic Introduction

Sensors that utilize the physical properties of infrared light to make measurements. Infrared rays, also known as infrared light, have the properties of reflection, refraction, scattering, interference, and absorption. Any substance, as long as it itself has a certain

temperature (above absolute zero), can radiate infrared light. Infrared sensors do not come into direct contact with the object to be measured when measuring, so there is no friction, and have the advantages of high sensitivity and fast response.

Infrared sensors include optical systems, detection elements and conversion circuits. The optical system can be divided into two categories according to different structures: transmission and reflection. The detection element can be divided into thermal detection

element and photoelectric detection element according to the working principle. The most widely used thermal element is the thermistor. Thermistor is subject to infrared radiation when the temperature rises, the resistance changes (this change may be larger or

smaller, because the thermistor can be divided into positive temperature coefficient thermistor and negative temperature coefficient thermistor), through the conversion circuit into an electrical signal output. Photoelectric detection elements are commonly used as

photosensitive elements, which are usually made of lead sulfide, lead selenide, indium arsenide, antimony arsenide, cadmium mercury telluride ternary alloy, germanium and silicon doped materials.

Infrared sensors are commonly used in the diagnosis and treatment of diseases (see thermal imaging camera); the use of infrared sensors on artificial satellites to monitor the Earth's cloud cover, a wide range of weather forecasting can be achieved; infrared sensors

can be used to detect the aircraft is running on the engine of the overheating situation.

Binoculars with infrared sensors can be used in military operations, in woodland warfare to detect enemies in dense forests, and in urban warfare to detect enemies behind walls, all of which utilize infrared sensors to measure the surface temperature of the human

body and thus learn the location of the enemy.

What Are The Types Of Ir Sensors?

Infrared sensors can be categorized according to their actions:

(1) Thermal type that converts part of infrared rays into heat and outputs signals such as changes in resistance value and electromotive force by heat extraction.

(2) Quantum type that utilizes the semiconductor migration phenomenon to absorb the photoelectric effect of energy difference and the photoelectric potential effect due to PN bonding.

The phenomenon of thermal type is commonly known as the pyrothermal effect, and the most representative ones are Thermal Bolometer, Thermopile and Pyroelectric.

Advantages of the thermal type: can be operated at room temperature, wavelength dependence (wavelengths of different sensitivity to have a great change) does not exist, the cost is cheap;

Disadvantages: low sensitivity, slow response (mS spectrum).

Advantages of quantum type: high sensitivity, fast response (μS spectrum);

Disadvantages: must be cooled (liquid nitrogen), wavelength dependence, high price;

Infrared sensors, especially the use of far-infrared range of sensitivity for the human body to detect the use of infrared wavelengths longer than visible light and shorter than the wave. Infrared let people think that only by the hot object radiation, but in fact not so,

where the existence of objects in nature, such as human beings, fire, ice and so on all will shoot out infrared rays, only its wavelength due to the temperature of the object and the difference. The human body temperature is about 36 ~ 37 ° C, the radiation peak of 9 ~

10 μm of far infrared, and heated to 400 ~ 700 ° C objects, can radiate a peak of 3 ~ 5 μm of the intermediate infrared.

Applications for Ir Sensors

Flame Detector

Flame sensor using 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 level of change in the level of the signal, 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 reflect the intensity of the principle of different obstacles, the detection of obstacles near and far. 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 The central processor can use the infrared return signal to recognize

the changes in the surrounding environment.

Infrared thermometer

The composition of the infrared thermometer is mainly composed of optical system, modulator, 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. [1]

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 can visualize the temperature distribution of an object in the form of an image.

Related Examples

The alarm can detect infrared rays emitted by the human body, when a person enters the monitoring area of the alarm, the alarm can be issued, applicable to the family, office, warehouse, laboratory and other relatively important occasions burglar alarm. The principle

of the device circuit is shown in Figure 1, by the infrared sensor, signal amplification circuit, voltage comparator, time delay circuit and audio alarm circuit and so on. Infrared detection sensor IC1 detects infrared signals radiated by the human body in front of the ②

foot output by IC1 weak electrical signals, amplified by transistor VT1 and other components of the first stage amplifier circuit, and then through the C2 input to the operational amplifier IC2 for high-gain, low-noise amplification, at this time by the IC2 ① feet of the

output signals have been sufficiently strong. IC3 for the voltage comparator, which is the ⑤ foot by R10, VD1 to provide a reference voltage comparator, VD1, the time delay circuit and audio alarm circuit. R10, VD1 provide reference voltage, when IC2 ① foot output

signal voltage reaches IC3 ⑥ foot, the two inputs are compared, at this time IC3 ⑦ foot from the original high level to a low level. IC4 for the alarm delay circuit, R14 and C6 delay circuit, the time is about 1 minute. When IC3's ⑦ foot becomes low level, C6 discharged

through the VD2, at this time the IC4 ② foot becomes low level, it is compared with the IC4 ③ foot reference voltage, when it is lower than its reference voltage, IC4 ① foot becomes high level, VT2 conductive, alarm BL energized to send out the alarm sound. After the

disappearance of the infrared signal of the human body, IC3 (7) feet and return to a high level output, at this time VD2 cutoff. As the voltage at both ends of C6 can not be changed abruptly, so through R14 to C6 slowly charge, when the voltage at both ends of C6 is

higher than its reference voltage, IC4 ① foot only to become a low level, the time is about 1 minute, that is, lasts for 1 minute alarm.