Sensor Signal Detection Device Temperature Correction
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Solution Overview
Problem
Conventional sensor signal detection devices face challenges in accurately correcting for temperature fluctuations when using constant voltage driving methods, as the application voltage is limited by saturation and threshold voltages, restricting sensor sensitivity and accuracy, especially in environments with significant temperature variations.
Innovation Solution
A sensor signal detection device employing a constant voltage power supply, a temperature detection element, and a short-circuit switch that alternates between sensor detection and temperature detection states, allowing for precise temperature correction by applying constant voltage to the sensor element and utilizing the temperature detection signal to adjust for temperature-induced fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If constant voltage driving method is used to maximize application voltage to sensor element, then power supply utilization is improved, but temperature fluctuation correction precision deteriorates
Solution Approach 1:
The patent applies periodic action by time-division multiplexing between sensor signal detection and temperature detection. The short-circuit switch alternates between connecting the temperature detection element to the sensor element (for temperature detection) and disconnecting it (for sensor detection), enabling both functions with constant voltage driving while achieving accurate temperature correction
Solution Approach 2:
The patent segments the detection process into two distinct phases: sensor signal detection phase and temperature detection phase. By separating these functions in time rather than space, the system can use constant voltage driving for both while maintaining measurement precision through sequential measurement and correction
2Measurement precision
If constant current driving method is used to eliminate temperature influence, then temperature correction precision is improved, but application voltage to sensor element is limited
Solution Approach 1:
The patent changes the driving parameter from constant current to constant voltage, while compensating for temperature effects through separate temperature detection and correction calculations. This allows maximizing application voltage to the sensor element while maintaining measurement precision through parameter transformation and correction
3Measurement precision
If temperature detection element is connected in series with sensor element, then temperature detection is enabled, but application voltage to sensor element is reduced
Solution Approach 1:
The patent uses periodic action through time-division multiplexing, where the temperature detection element is connected in series only during temperature detection phase, and disconnected during sensor detection phase. This periodic connection enables temperature detection capability while minimizing voltage division effects on sensor element
Solution Approach 2:
The patent applies preliminary action by performing temperature detection at specific intervals and using the detected temperature information to correct subsequent sensor measurements. The temperature detection element is connected beforehand to acquire temperature data, which is then used to correct sensor signals, enabling accurate temperature compensation without continuous series connection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables maximum detection sensitivity and accurate temperature correction, similar to constant current methods, while fully utilizing the voltage power supply, thereby enhancing the precision of temperature compensation in varying environments.
Implementation Method 1
a temperature detection element connected to the sensor element in series
Data Source
AI summary
Sensor signal detection device includes: a sensor element; a temperature detection element connected in series with the sensor element; a constant voltage power supply applying constant voltage to a series circuit of the temperature detection element and the sensor element; a short-circuit switch short-circuiting both terminals of the temperature detection element; and a controller controlling a changeover between a sensor detection state and a temperature detection state. In the sensor detection state, a sensor signal from the sensor element is obtained by turning on the short-circuit switch to apply the constant voltage across both terminals of the sensor element from the constant voltage power supply. In the temperature detection state, a temperature detection signal of the temperature detection element is obtained by turning off the short-circuit switch to connect the temperature detection element to the sensor element in series and applying constant voltage from the constant voltage power supply.