Software techniques for sensor compensation

Application of Analog Adaptive Filters for Dynamic Sensor Compensation

“…3, can be used to model the behavior of the load cell. The state-variable filter transfer function is (7) where (8) Comparing this transfer function with the load cell transfer function, (2), shows that can model ( ). has to be split into a fixed resistor equal to and an additional resistor proportional to .…”

“…Usually, in classic adaptive techniques, an adaptive algorithm, such as a least mean squares (LMS) method, updates to minimize a cost function. However, (2) shows that, for a load cell, the suitable filter has a pair of conjugate zeros , which and can be considered as the parameters of adaptive filter and the relationship between them and load can be modeled as in (3) and (4). The real-time measurement operation is shown in Fig.…”

“…The Laplace transfer function of this sensor is (2) This shows that affects all inertial parameters of the sensor such as gain factor , quality factor , and natural frequency . Equation (2) yields a pair of complex conjugate poles where (3) and (4) Thus, the zeros of the adaptive filter, which are the poles of the sensor, can be obtained.…”

“…Several methods have been reported addressing this problem. Software techniques for sensor compensation are reviewed in [2]. Digital adaptive techniques have been used in [3] for load cell response correction.…”

Sensors Auto-calibration Method - Using Programmable Interface Circuit Front-end

“…The existing conventional correction techniques are essentially based either on the hardware adjustment of the sensor response [1], or on lookup tables [2]. The calibration of sensors using these methods is usually of a high cost and time consuming.…”