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Nanjing Zhuohua Electric Co., Ltd
5th Floor, Building 6, Wanyang Technology Innovation City, Liuhe District, Nanjing City
A sensor (English name: transducer/sensor) is a detection device that can sense the measured information and convert it into electrical signals or other required forms of information output according to certain rules to meet the requirements of information transmission, processing, storage, display, recording, and control.
The characteristics of sensors include miniaturization, digitization, intelligence, multifunctionality, systematization, and networking. It is the primary step in achieving automatic detection and control. The existence and development of sensors have endowed objects with senses such as touch, taste, and smell, gradually bringing them to life. Usually, based on their basic sensing functions, they are divided into categories such as thermosensitive elements, photosensitive elements, gas sensitive elements, force sensitive elements, magnetic sensitive elements, humidity sensitive elements, sound sensitive elements, radiation sensitive elements, color sensitive elements, and taste sensitive elements. To adapt to this situation, sensors are needed. Therefore, it can be said that sensors are an extension of human facial features, also known as electrical features.
With the arrival of the new technological revolution, the world has entered the information age. In the process of utilizing information, the first thing to solve is to obtain accurate and reliable information, and sensors are the main way and means to obtain information in the natural and production fields.
In modern industrial production, especially in automated production processes, various sensors are used to monitor and control various parameters in the production process, so that the equipment can work in normal or excellent condition and achieve product quality. Therefore, it can be said that without numerous excellent sensors, modern production loses its foundation.
In basic discipline research, sensors have a more prominent position. The development of modern science and technology has entered many new fields: for example, at the macro level, we need to observe the vast universe of thousands of light years, at the micro level, we need to observe the particle world as small as FM, vertically, we need to observe the evolution of celestial bodies for hundreds of thousands of years, and even the instantaneous reactions as short as s. In addition, various technological studies have emerged that play an important role in deepening material understanding, exploring new energy, new materials, etc., such as ultra-high temperature, ultra-low temperature, ultra-high pressure, ultra-high vacuum, * magnetic field, ultra weak magnetic field, etc. Obviously, it is impossible to obtain a large amount of information that cannot be directly obtained by human senses without suitable sensors. Many obstacles in basic scientific research lie in the difficulty of obtaining object information, and the emergence of new mechanisms and high-sensitivity detection sensors often leads to breakthroughs in this field. The development of some sensors is often developed by some interdisciplinary fields.
Sensors have already penetrated into a wide range of fields such as industrial production, space development, ocean exploration, environmental protection, resource investigation, medical diagnosis, biotechnology, and even cultural relic protection. It can be said without exaggeration that almost every modern project, from the vast space, to the vast ocean, to various complex engineering systems, cannot do without various sensors.
It can be seen that the important role of sensor technology in developing the economy and promoting social progress is very obvious. Countries around the world attach great importance to the development of this field. I believe that in the near future, sensor technology will make a leap forward and reach a new level commensurate with its important position.
weighing
A weighing sensor is a force to electricity conversion device that can convert gravity into electrical signals, and is a key component of electronic scales.
There are various types of sensors that can achieve force to electricity conversion, including resistance strain sensors, electromagnetic force sensors, and capacitive sensors. Electromagnetic force type is mainly used in electronic scales, capacitive type is used in some electronic hanging scales, and the vast majority of weighing products still use resistance strain type weighing sensors. The resistance strain type weighing sensor has a simple structure, high accuracy, wide applicability, and can be used in relatively poor environments. Therefore, resistance strain gauges have been widely used in weighing instruments.
Resistive strain type
The resistance strain gauge in the sensor has the strain effect of metal, which produces mechanical deformation under external force, resulting in a corresponding change in resistance value. There are mainly two types of resistance strain gauges: metal and semiconductor. Metal strain gauges can be divided into wire type, foil type, and thin film type. Semiconductor strain gauges have advantages such as high sensitivity (usually tens of times that of wire and foil) and small lateral effects.
piezoresistive
A piezoresistive sensor is a device made by diffusing resistance on a semiconductor substrate based on the piezoresistive effect of the semiconductor material. The substrate can be directly used as a measuring sensing element, and the diffusion resistance is connected in the form of a bridge inside the substrate. When the substrate is deformed by external force, the resistance values will change, and the bridge will produce corresponding unbalanced output.
The substrate (or membrane) materials used as piezoresistive sensors are mainly silicon wafers and germanium wafers. Silicon piezoresistive sensors made of silicon wafers as sensitive materials are increasingly being valued, especially solid-state piezoresistive sensors used for measuring pressure and velocity. degree of vacuum
The vacuum sensor, produced using advanced silicon micro machining technology, is an absolute pressure transmitter made with an integrated silicon pressure resistance sensing element as the core component of the sensor. Due to the use of a vacuum reference pressure chamber formed by silicon silicon direct bonding or silicon Pailux glass electrostatic bonding, as well as a series of stress free packaging technologies and precision temperature compensation technologies, it has outstanding advantages of excellent stability and high accuracy, and is suitable for measuring and controlling absolute pressure in various situations.
Characteristics and Applications
Adopting low range chip vacuum absolute pressure packaging, the product has high overload capacity. The chip adopts vacuum filled silicone oil isolation and stainless steel film for pressure transfer, with excellent medium compatibility, suitable for measuring the vacuum pressure of the vast majority of gas-liquid media that do not corrode 316L stainless steel. Vacuum transmission is applied to low vacuum measurement and control in various industrial environments.
Capacitive level
Capacitive level sensors are suitable for industrial enterprises to measure and control the production process, mainly used for long-distance continuous measurement and indication of liquid level or solid material level in conductive and non-conductive media.
The capacitive liquid level sensor consists of a capacitive sensor and an electronic module circuit. It is based on a two-wire system with a constant current output of 4-20mA. After conversion, it can be output in a three wire or four wire manner, and the output signal is formed into standard signals such as 1-5V, 0-5V, 0-10mA, etc. A capacitive sensor consists of insulated electrodes and a cylindrical metal container containing a measuring medium. When the material level rises, the capacitance changes with the height of the material because the dielectric constant of non-conductive materials is significantly lower than that of air. The module circuit of the sensor consists of reference source, pulse width modulation, conversion, constant current amplification, feedback, and current limiting units. The advantages of using pulse width modulation principle for measurement are low frequency, good stability, good linearity, and no significant temperature drift to the surrounding RF interference.
Antimony electrode acidity
Antimony electrode acidity sensor is an industrial online analytical instrument that integrates pH detection, automatic cleaning, and electrical signal conversion. It is a pH measurement system composed of antimony electrode and reference electrode. In the tested acidic solution, due to the formation of an antimony trioxide oxide layer on the surface of the antimony electrode, a potential difference will be formed between the metal antimony surface and antimony trioxide. The magnitude of this potential difference depends on the concentration of antimony trioxide, which corresponds to the moderate concentration of hydrogen ions in the measured acidic solution. If the appropriate values of antimony, antimony trioxide, and aqueous solution are all taken as 1, their electrode potentials can be calculated using the Nernst formula.
The solid module circuit in the antimony electrode acidity sensor consists of two main parts. For the safety of on-site operation, the power supply uses AC 24V to power the secondary instruments. This power supply should not only provide driving power for the cleaning motor, but also be converted into corresponding DC voltage through a current conversion unit for use in the transmission circuit. The second part is the measurement sensor circuit, which amplifies the reference signal and pH acidity signal from the sensor and sends them to the slope adjustment and positioning adjustment circuit to reduce the internal resistance of the signal and make it adjustable. The amplified pH signal is superimposed with the temperature compensated signal and then subtracted into the conversion circuit. Finally, a 4-20mA constant current signal corresponding to the pH value is output to the secondary instrument for display and control of the pH.
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