Xi'an Kacise Optronics Co., Ltd.
Address:：Tangyan South Road, Xi'an
Application of Pressure Transmitter Principle
Pressure transmitter is the most commonly used in industrial applications, a sensor, which is widely used in a variety of industrial-controlled environment, involving water and electricity, transportation, military, aerospace, machine tools, pipe production, and many other industries, the type of pressure transmitter Can be divided into the following: resistance pressure transmitter, semiconductor pressure transmitter, piezoresistive pressure transmitter, inductive pressure transmitter, capacitive pressure transmitter, and so on. But the most widely used is the piezoresistive pressure transmitter, it has a low price and high precision and better linear characteristics. Here we mainly introduce several categories.
1. pressure transmitter
In understanding the piezoresistive pressure transmitter, we must first understand the resistance strain gauge this component. The strain gauge is a sensitive device that converts the strain change on the DUT into an electrical signal. It is one of the main components of a piezoresistive strain transmitter. It is the most widely used metal resistance strain gauge and semiconductor strain gauge two. Usually the strain gauges are tightly adhered to the resulting mechanical strain matrix by means of a special adhesive. When the stress of the substrate is changed, the strain gauges are also deformed together to change the resistance of the strain gages so that The voltage applied to the resistor changes.
2. the proliferation of silicon pressure transmitter
Diffused silicon pressure transmitter refers to the pressure of the test medium directly on the sensor diaphragm, so that the diaphragm and the media pressure is proportional to the micro-displacement, the sensor resistance value changes, and the use of electronic circuits to detect this Change, and convert the output of a standard measurement signal corresponding to this pressure.
3.piezoelectric pressure transmitter sensor
Piezoelectric materials mainly used in piezoelectric materials include quartz, potassium tartrate and dihydrogen phosphate. Which is a natural crystal quartz, piezoelectric effect is found in the quartz crystal, in a certain temperature range, the piezoelectric properties have been there, when the temperature exceeds this range, the piezoelectric properties completely disappear, with the stress The change in the electric field changes little, so the quartz is gradually replaced by other piezoelectric crystals. Potassium tartrate has a large piezoelectric sensitivity and piezoelectric coefficient, but it can only be used in room temperature and low humidity environment. As for the dihydrogen phosphate is an artificial crystal, can withstand high temperature and high humidity, it has been widely used. The piezoelectric effect is now also applied to polycrystals.
4. capacitive pressure transmitter
Ceramic capacitive sensors have measurements for normal or corrosive media, such as gases or liquids, but do not tend to have the use of precipitated, crystalline or stiffened materials. Mainly used in cabin level measurement