Research and application of sensor technology in production practice

With the rapid development of science and technology, non-physical testing and control technologies have been widely used in aerospace, aviation, transportation, metallurgy, machinery manufacturing, petrochemical, light industry, technical supervision and testing and other technical fields, and It is gradually being introduced into people's daily lives. It can be said that the level of test technology and automatic control is an important indicator to measure the degree of modernization of science and technology in a country.
Sensor technology is an important part of testing and automatic control. In the test system, it is used as a primary instrument positioning, and its main feature is that it can accurately transmit and detect information of a certain form and convert it into information of another form.

Specifically, the sensor refers to a component or device that has a feeling (or response) and a detection function for a certain information of the measured object, and converts it into an output signal corresponding thereto according to a certain rule. Without accurate and reliable capture and conversion of the original information being measured, all accurate testing and control will not be possible. Even the most modern electronic computers do not have accurate information (or convert reliable data), without distortion. Input will also not fully play its due role.

There are many types and types of sensors, and the principles are varied. Among them, the resistance strain sensor is a force measuring device widely used in electronic scales and various new types of mechanisms. Its accuracy and range are too high precision requirements selected according to needs. A wide range also reduces measurement accuracy, and can result in excessive cost and increased process difficulties. Therefore, it is important to properly select the accuracy and range according to the requirements of the measurement object. However, the sensor used in any condition and occasion requires stable performance, reliable data and durability. For this reason, while studying high-precision sensors, attention must be paid to the study of reliability and stability. At present, sensor technology including research, design, trial production, production, testing and application of bed hidden devices has gradually formed a relatively independent specialized discipline.

Under normal circumstances, because the location of the sensor is not ideal, under the combined effects of temperature, humidity, pressure and other effects, the zero drift and sensitivity of the sensor can be changed, which has become a serious problem in use. Although people take temperature compensation and seal moisture-proof measures in the process of making sensors, they are happy with the strain gauges, the adhesive itself, the accuracy and skill of the adhesive technology, the choice of elastomer materials, and the cold and heat. The formulation of the processing technology is closely related, and no one can ignore it. It needs to be carefully designed and produced. At the same time, it is necessary to pay attention to the installation method of the sensor, the setting of the support structure, and how to overcome the lateral force and other problems.
The sensor as a primary meter usually consists of a sensitive component and a transducer component.

The conversion component is a precision bridge. Therefore, the force scale re-use resistance strain sensor is mainly composed of an elastomer, a strain gauge, a glue, and various compensation resistors. His stability must also be determined by the combined effects of the internal and external factors of these components. This article explores this issue, talks about some shallow views, and discusses with peers.

The first is the elastic element. The elastic element is generally processed from high-quality alloy steel and non-ferrous metal aluminum, beryllium bronze, etc., which affects the stability of the elastomer, mainly its metallographic structure and residual stress after various treatments. Considering the mutual equilibrium relationship during stress release and the constraint of the elastic structure form, in order to release the residual stress, aging treatment is required. In practice, if the natural aging method is adopted, the release is slow and the cycle is long, which is often impossible. Take, need to artificially shorten the time, generally to eliminate the residual stress on the surface of the elastomer is: vacuum tempering treatment and fatigue pulsation processing and resonance. This can greatly reduce the residual stress, complete the usual long-term natural aging in a short time, and make the structure performance more stable.

Secondly, it is a strain gauge and an adhesive. The stability of the strain gauge is the foil itself. There are many types of resistive alloys for making strain gauges. Among them, the use of the constant copper alloy is the most widely used. It has good stability, high fatigue life and small temperature coefficient of resistance. Wire grid manufacturing materials. In addition, the instability caused by adverse effects should be eliminated during the manufacture of strain gauges. For example, the bonding strength between the wire grid and the base rubber, the bonding strength between the strain gauge and the elastic body, and the release of the internal stress of the base rubber are all unstable factors. In addition, the adhesion of strain gauges is also one of the most important elements. The quality of this work directly affects the bonding quality of the glue, and even the measurement accuracy. If the film is not strict, the technology is not skilled, even if the best is used. The strain gauges did not help.

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