Grid measuring system and its application

Since 1972, Swiss company Trimos and its subsidiary SYLVAC have successfully developed a capacitive measuring system for length measurement, the capacitive measuring system has been widely used in precision electronic measuring instruments and digital display meters. Many companies at home and abroad are actively researching and applying this technology, and have achieved good results. After years of efforts, our company has applied capacitive measuring system technology to electronic digital measuring tools and digital display meters to develop and produce a wide range of digital display products.

First, the basic principle and characteristics of the capacitive grid measurement system:

The capacitive grid measurement system is a closed-loop control system with no difference adjustment. Its basic measurement part is a differential capacitor. Its function is to use the charge-coupling method of the capacitor to convert the mechanical displacement into the corresponding change of the electrical signal. After the electrical signal is sent to the electronic circuit, the magnitude of the mechanical displacement is displayed after a series of transformations and operations.

Due to the principle of the capacitive measuring system and the advanced design of its structural design, it has many outstanding advantages:

1. Since the sensor adopts an equal-pitch gate structure, the measurement accuracy is not directly related to the length, so it is very suitable for large displacement measurement.
2. Measurement speed is fast. When the resolution is 0.001mm, the measurement speed can reach 0.35m/s; when the resolution is 0.01mm, the measurement speed can reach 1.5m/s. The grating and inductive synchronizer digital display measuring device with a resolution of 0.001 mm should generally have a measuring speed of about 0.2 m/s. Other sensors that measure large displacements rarely reach the level of capacitive sensors in terms of measurement speed.
3. The sensor has a simple structure, is easy to be integrated with the integrated circuit, and is easy to mechanically design. The mechanical part of the sensor is mainly composed of two sets of plates, and the structure is small, which makes the measurement system simple in structure and low in cost. This advantage is also unmatched by other types of displacement measurement systems.
4. The requirements for the use environment are not high. It can resist the interference of electricity and magnetic field. After adopting appropriate protective measures, it can prevent oil, dust and air, and is not sensitive to air humidity. It is suitable for use in workshop production. This is also a prominent advantage of the capacitive measuring system.
5. Less energy consumption. This is due to the fact that the dielectric loss and electrostatic attraction of the sensor itself are small. The circuit uses a large-scale CMOS integrated circuit to enable the circuit to work at the bottom. A button-type silver oxide electromagnetic can make it work continuously for one year. This advantage enables digital display on general purpose precision gauges and makes it a promising product.
6. Many functions and convenient use. The electronic circuit of the capacitance measuring system has been improved by several degrees, and the system has been gradually improved. The current circuit has any point zero, metric conversion, value retention, maximum value minimum search, value pre-value, measurement speed too fast and electromagnetic Functions such as low voltage alarms make the measurement system easy to use and ensure the correctness of the measured data.
7. Serial code data output, which can be used by the computer to process the corresponding requirements and the printer to record data. This provides a convenient condition for product quality control.

Second, the development and status of the capacitive grid measurement system

The measuring principle of the capacitive grid measuring system is novel, and the measuring circuit is unique, so that the measuring instrument formed by the measuring device is reliable, high precision, low power consumption, light weight, strong anti-interference performance, anti-vibration, anti-pollution, and high assembly yield. The research departments and production enterprises of various countries attach great importance to it. After nearly 20 years of development, their performance and level have been greatly improved. A high-precision measuring system with a resolution of 0.001 mm has been realized, and its application direction has also expanded from the initial large stroke length measurement to the angle measurement. When the measuring range of the electronic digital altimeter of Trimos in Switzerland is 500mm, the precision can be within 0.005mm and the measuring range is 1000mm, the precision can be controlled within 0.01mm. In China, the company has also achieved great results in the development of capacitive grid systems. It has been able to provide capacitive grid measurement systems for various measuring instruments such as electronic digital calipers, electronic digital micrometers, and electronic digital dial gauge circuits.

Measuring instruments and instruments consisting of a capacitive measuring system have been accepted by a wide range of users around the world, and the development momentum has increased. Famous foreign measuring instrument manufacturers, such as Mitutoyo in Japan, Trimos in Switzerland, and Carl Marl in Germany, use this technology to develop various digital measuring instruments. In addition to the development of electronic calipers, electronic dial gauges, electronic micrometers and other measuring tools, it has also developed a variety of coordinate measuring instruments such as crankshaft measurement, CNC tool measurement and box parts measurement. With the development of electronic technology and the improvement of production level, the capacitive grid measurement system will have greater development.

Third, the application of the capacitive grid measurement system

Due to the many advantages of the capacitive grid measurement system, it provides favorable conditions for our company to develop, develop and produce electronic digital measuring tools and measuring instruments. Through the research and development of the capacitive grid measurement system, our company has produced a series of electronic digital dialectometers, electronic digital dial gauges, capacitive digital micrometers, and capacitive digital angle goniometers. Products such as the capacitive digital scale and its matching multi-coordinate capacitive display digital display and adapters for communication with computers, and the use of capacitive digital display measurement technology for users to develop a number of dedicated or comprehensive measuring instruments required by users And the device, better meet the needs of users.

In summary, the capacitive grid measuring system is applied to the measuring instrument product with low cost, convenient use and low requirements on the use environment. Compared with the digital measuring system composed of other sensors, the advantages are extremely obvious, so we will actively apply this technology to develop various types of digital measuring instruments to provide users with suitable products.

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