Technical analysis of the visual measurement mechanism of Window style torque gauge- Hangzhou Hao Gong Tools Co., Ltd.

The precise measurement system of Window style torque gauge converts the weak electrical signal transformed by the deformation of the elastic element into an accurate and visual torque value, which is a key link in achieving accurate measurement. Since the initial electrical signal is not only of small amplitude, but also easily affected by environmental factors such as electromagnetic interference and temperature fluctuations, a rigorous and efficient signal processing system is required to ensure the reliability of the data and the accuracy of visualization. The coordinated operation of the signal conditioning circuit and the microprocessor constitutes the core technical architecture of this process.
As the pre-processing center, the signal conditioning circuit integrates three core modules of amplification, filtering and linearization, and optimizes the different defects of the initial electrical signal. The amplification circuit adopts a multi-stage operational amplifier cascade design. By carefully selecting high-gain and low-noise amplifier chips, it can amplify the weak electrical signal of the microvolt level to the standard voltage range of the volt level. This amplification is not a simple signal strength enhancement, but a negative feedback circuit is used to suppress nonlinear distortion while maintaining the original characteristics of the signal, ensuring that the amplified signal is still strictly proportional to the torque value.
The filter circuit is responsible for purifying the signal. It effectively filters out the noise interference mixed in the electrical signal by setting a specific frequency response characteristic. In industrial sites, electrical signals are easily affected by electromagnetic interference generated by motor operation, high-frequency communication equipment, etc., and there is also low-frequency drift caused by temperature changes. To address such problems, the filter circuit often adopts a bandpass filter structure to allow specific frequency band signals related to the torque signal to pass through, while attenuating high-frequency noise and low-frequency drift.
The introduction of the linearization circuit is to compensate for the nonlinear errors of elastic elements and strain gauges in practical applications. Affected by factors such as material properties and processing technology, there may be nonlinear deviations between the actual output signal and the torque. The linearization circuit corrects the electrical signal in real time through pre-stored calibration data and interpolation algorithms. Using segmented linearization technology, the measurement range is divided into multiple intervals, and different correction coefficients are used in each interval to compensate the signal, so that the final output signal and the torque value show a highly linear relationship, significantly improving the measurement accuracy.
The electrical signal preprocessed by the signal conditioning circuit will be transmitted to the built-in microprocessor for in-depth processing. The microprocessor performs multiple calibrations and calculations on the signal based on the preset algorithm. On the one hand, the temperature compensation data of the sensor is combined to eliminate the influence of ambient temperature changes on the measurement results; on the other hand, through multiple sampling and digital filtering algorithms, residual noise is further suppressed to improve data stability. The microprocessor converts the processed torque value into a digital signal and drives the window display for visual presentation. Modern window style torque gauges mostly use liquid crystal display (LCD) or light-emitting diode display (LED). LCD is suitable for conventional measurement scenarios with its low power consumption and high resolution, while LED is more suitable for clear readings in strong light environments with its high brightness and high contrast. The wide viewing angle design of the display ensures that operators can obtain accurate and clear torque data when observing from different angles.