Thin-Film Temperature Sensor Measurement Circuit with Dynamic Nonlinear Compensation
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Solution Overview
Problem
Existing measurement circuits for thin-film temperature sensors have limited versatility and cannot adapt to different nonlinear parameters, leading to poor performance across various temperature ranges and incompatibility with different sensors.
Innovation Solution
A measurement circuit for thin-film temperature sensors that includes a first and second operational amplifier, a potentiometer, a thin-film resistor, and specific resistor configurations, allowing for dynamic adjustment of the potentiometer resistance to compensate for nonlinear errors and adapt to different sensor parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed parameters are used in the measurement circuit for nonlinear compensation, then the circuit can achieve good tracking characteristics and compensation effect in specific temperature areas, but the measurement device has poor versatility and cannot meet the interchangeability requirement of different sensors
Solution Approach 1:
The patent transforms the fixed compensation parameters into dynamic adjustable parameters. By introducing a digital potentiometer that can be adjusted according to different sensor characteristics, the measurement circuit adapts to various sensors while maintaining compensation accuracy. The potentiometer's resistance value can be modified to match different nonlinear parameters of temperature sensors, enabling both precision compensation and sensor interchangeability
Solution Approach 2:
The patent changes the compensation parameters from fixed values to adjustable values. The digital potentiometer allows the compensation parameters to be modified according to different sensor nonlinear characteristics. This parameter adjustment capability enables the same circuit to work with multiple sensor types while maintaining measurement precision through appropriate parameter selection
2Measurement precision
If traditional nonlinear compensation methods are used with fixed parameters, then the circuit achieves compensation in low-temperature and high-temperature areas, but the measurement device cannot adapt to different nonlinear parameters within a certain change range
Solution Approach 1:
The patent makes the compensation parameters dynamic by using an adjustable digital potentiometer instead of fixed resistors. This allows the circuit to adapt to different nonlinear parameters of temperature sensors by adjusting the potentiometer's resistance value, thereby maintaining measurement accuracy across various sensor types and temperature ranges
Solution Approach 2:
The patent creates a universal measurement circuit that can work with multiple types of temperature sensors. The adjustable compensation parameters enable the same circuit design to accommodate different sensor nonlinear characteristics, making the measurement device multi-functional and adaptable to various sensor models within a certain parameter range
Data Source
AI summary
A measurement circuit of thin-film temperature sensor comprises: out-phase input end and output end of first operational amplifier are connected to first end of thin-film resistor; first end of first resistor is connected to output end of first operational amplifier, second end of first resistor is connected to in-phase input end of first operational amplifier; second end of first resistor is grounded via second resistor; output end of second operational amplifier is connected to first end of potentiometer; second end of the potentiometer is connected to the constant current source and in-phase input end of second operational amplifier respectively; first end of third resistor is connected to output end of second operational amplifier, second end of third resistor is connected to out-phase input end of second operational amplifier; second end of third resistor is grounded via fourth resistor; voltage value of second end of potentiometer is output signal.