Reasons for Adjusting the Output of 3D Force Sensors
Release Time:
2025-11-01
When the zero-point output of a 3D force sensor is too high, it not only creates significant challenges for each step in the production process but also makes it inconvenient to calibrate the display and control instruments during operation, further increasing measurement errors. To facilitate zeroing of the display and control instrument, minimize measurement inaccuracies, and ensure interchangeability, the zero-point output of the 3D force sensor should be adjusted as close to zero as possible—or kept within an acceptable tolerance range. Additionally, during the pasting, pressing, and curing processes, the resistance values of the resistive strain gauges may fluctuate, leading to discrepancies, or even substantial differences, among the resistances of the four bridge arms that make up the Wheatstone bridge. This imbalance prevents the bridge from achieving its intended equilibrium state, ultimately causing the 3D force sensor to exhibit a relatively large zero-point output even when no external load is applied.
Three-dimensional force sensors typically employ a full-bridge, equal-arm Wheatstone bridge configuration. The output voltage of the sensor is given by the formula: \[ U = \frac{R_1R_3 - R_2R_4}{(R_1 + R_2)(R_3 + R_4)} \] where \( R_1, R_2, R_3, \) and \( R_4 \) represent the resistances of the four bridge arms in the three-dimensional force sensor. From this output voltage equation, we can derive the balance condition for the bridge (i.e., when \( U_0 = 0 \)): \[ R_1R_3 = R_2R_4 \quad \text{or} \quad \frac{R_1}{R_2} = \frac{R_4}{R_3}.
Zero-point output refers to adjusting the output value of a three-axis force sensor to be close to zero—or within the specified tolerance range—when no external load is applied. The manufacturing process of resistance strain gauges inherently introduces a certain degree of variation in their resistance values. Although the strain gauges used in three-axis force sensors undergo rigorous organization, measurement, and screening, it remains impossible to achieve perfectly identical resistance values among strain gauges bonded onto the same component.
Get a Free Consultancy
We will contact you within one working day. Please pay attention to your email.
Nanjing Bio-inspired Intelligence Technology Co., Ltd.
南京神源生智能科技有限公司
Contact Us
Webchat
Copyright © 2025 Nanjing Bio-inspired Intelligence Technology Co., Ltd.