Principle and application of temperature sensors
Principle and application of temperature sensors, temperature sensors are very wide range of applications, it has a certain role in the conversion of energy, in all walks of life in fact, can see the body of the temperature sensor, the following for you to share the principle of temperature sensors and applications.
Temperature sensor principle and application 1 Temperature sensor working principle: As a sensor is nothing more than a certain form of energy into another form of energy. For the conversion form there are two types: active and passive. Active sensors can convert one form of energy directly into another, without the need for external energy or excitation source. Passive sensors can not directly convert the form of energy, but it can control the energy or excitation from another input, the sensor to undertake the specific characteristics of an object or process into a quantity of work. The "object" can be solid, liquid, or gas, and their state can be static or dynamic (i.e., process). Object properties can be detected in a variety of ways after they have been converted and quantified. The properties of the object can be physical or chemical in nature. According to its principle of operation, it converts the object characteristics or state parameters into measurable electrical quantities, and then separates this electrical signal and sends it to the sensor system to be evaluated or labeled, so that the sensor's work is over. Temperature sensor applications: In the rapid development of science and technology today, electronic temperature sensors because of its important role for the safety and security, has been widely used in such as biopharmaceuticals, aseptic chambers, clean factories, telecom, banks, libraries, archives, museums of cultural relics, intelligent buildings and so on. Various industries need temperature monitoring places and fields. The most extensive side is the computer room, the following computer room as an example to explain the electronic temperature sensor in the computer room in the `application The information processing and exchange of the heavy responsibility of the computer room is the entire information network engineering data transmission center, data processing center and data exchange center. In order to ensure the normal operation of equipment and staff to have a good working environment, the monitoring of temperature and humidity of the room is essential, reasonable and normal temperature and humidity environment is an important guarantee of normal operation of equipment in the room. With the continuous development of computer technology and the extensive use of computer systems, the computer room environment must meet the computer equipment temperature, humidity and other technical requirements. The temperature and humidity of the computer room as a necessary condition for the normal operation of computer equipment, we must install temperature sensors in a reasonable location in the computer room to realize the temperature, humidity, 24-hour real-time monitoring, and can be in the control room monitoring host real-time display of temperature measurements in various locations. The principle and application of temperature sensors2 Intake air temperature sensor bad how to detect 1, detection resistance: If the intake air temperature sensor itself or its wiring failure, it will lead to the engine startup difficulties, unstable idling speed, exhaust pollutants emissions increase, intake air The resistance of the temperature sensor detection method and requirements and coolant temperature sensor is basically the same. For single-piece inspection, place the ignition switch in the OFF position, remove the intake air temperature sensor wire connector, and remove the sensor. Heat the air intake temperature sensor with an electric blow dryer, or hot water, and measure the resistance between the two terminals at different temperatures with a multimeter resistance. Compare the measured resistance value with the standard value, if it does not match with the standard value, the air intake temperature sensor should be replaced. Install the intake air temperature sensor and tighten the sensor with a torque of about 10Nm. When checking the intake air temperature sensor whose structure is similar to the water temperature sensor, the method of checking the water temperature sensor can be used. Under normal conditions, the resistance value is about 2-3 kOhm when the temperature is 20 degree C. When it is 80 degree C, the resistance value is about O. 4-0.7 kOhm. If the measurement results do not meet the specified requirements, the sensor should be replaced, installed in the air flow sensor in the air temperature sensor is damaged, the air flow sensor should be replaced. 2, test voltage: (1) test the power supply voltage: remove the intake air temperature sensor wiring harness plug, open the ignition switch, measure the power supply voltage of the intake air temperature sensor, it should be 5V. (2) Measurement of input: signal voltage. Place the ignition switch in the ON position, use the voltage block of the multimeter to measure the voltage between THA and E2 of the ECU in the diagram, the voltage value should be within the range of 0.5~3.4V (20 degree C). If not in the specified range, you should further check whether the air intake temperature sensor connection line is poor contact or there is a broken circuit, short-circuit failure. (3) Check the inlet air temperature sensor connection harness resistance. Measure the resistance between the sensor plug and the ECU plug terminals with a digital multimeter, i.e., the sensor signal terminal, ground terminal and the corresponding ECU's two terminal resistors. If not conductive or resistance value is greater than 1Ω, indicating that the sensor connection line or plug contact is poor, should be further checked. Infrared temperature sensor principle Infrared temperature sensor, in nature, when the temperature of the object is higher than absolute zero, due to the existence of its internal thermal movement, it will continue to radiate electromagnetic waves to the surrounding area, which contains infrared wavelengths located in the 0.75 ~ 100μm, the infrared. Infrared temperature sensors are made using this principle. Temperature is a measure of the degree of coldness of the object is a physical quantity, is very common in industrial production, is very important to a thermal parameter, many production processes are required to monitor and control the temperature, especially in the chemical industry, food and other industries in the production process, the measurement and control of the temperature directly affects the quality of the product and performance. Infrared: Infrared is a kind of human eye can not see the light, but in fact it is the same as any other light, is a kind of objective existence of the material. Any object as long as its temperature is above thermodynamic zero, there will be infrared radiation to the surrounding. Infrared light is located in the visible light other than red light, so it is called infrared. Its wavelength range is roughly within the 0.75-100μm spectrum. Infrared radiation: The physical nature of infrared radiation is thermal radiation. The higher the temperature of an object, the more infrared radiation is radiated, and the stronger the energy of infrared radiation. It has been found that the thermal effect of various monochromatic light in the solar spectrum from violet light to red light is gradually increasing, and zui big thermal effect appears in the frequency range of infrared radiation, so people will also be called infrared radiation thermal radiation or heat rays. Sensing principle: Thermal sensor is the use of radiation thermal effect, so that the detector device to receive radiation energy caused by the temperature rise, and then make the sensor in a column with the temperature of the performance changes. Detecting a change in one of the properties, you can detect the radiation. In most cases is through the Seebeck effect to detect radiation, when the device receives radiation, causing a non-electrical physical changes, but also through the appropriate changes into the amount of electricity after the measurement. Infrared Temperature Sensor Applications Non-Contact Temperature Measurement Infrared Radiation Detection Temperature Measurement of Moving Objects Continuous Temperature Control Thermal Early Warning Systems Temperature Control Medical Devices Long Range Measurements Medical Devices Infrared temperature sensor in the application of intelligent air conditioning Comfortable living environment is what we all **** the same pursuit, with the development of electronic technology, science and technology has changed the life around us, technologically intelligent home life will become possible. Air conditioning as an important home appliance, its innovation and development of technology is also progressing, the new intelligent air conditioning using a variety of sensor technology as well as new scientific and technological technology, to achieve a healthy and comfortable air conditioning, energy saving and environmental protection of the intelligent goal. Infrared temperature sensors in the application of intelligent air conditioning The traditional air conditioning air volume and the location of the air is fixed, people in the room, the air conditioning air size will not change, so that can only be fixed out of the wind, not only to meet the needs of the people, but also a waste of electricity, the new intelligent sensors are installed. The new intelligent sensor installed using infrared sensor design of the kinetic meter, infrared temperature sensor sensing the amount of human activity, on-demand distribution of air volume. Let different people have their own comfort, air conditioning on the kinetic instrument can be divided into 5 regions of the indoor space, and real-time monitoring of the 5 regions, and in 140 degrees of a wide range of real-time monitoring and acute perception of the amount of human activity and zoning differentiated on-demand wind, so as to adapt to the personalized needs of different family members, and thus improve the overall comfort of air-conditioned rooms. Intelligent air conditioning motion sensor by three groups of infrared temperature sensors at different angles, each group of motion sensors have two sensor head, *** there are six sensor head on the outlet to intelligently adjust the amount of wind and wind direction, automatic recognition of the human body position and the amount of activity, constantly update the data collection, intelligent analysis of the data, according to the amount of different human activities for differentiation of the wind, so that different amounts of activity of the people feel comfortable, and reduce the amount of human feeling to reach the human sense of the wind, so as to improve the overall comfort of the air conditioning room. The air conditioning system is designed to provide a comfortable environment for people with different levels of activity, and to reduce the time it takes to reach the desired temperature.