Thermistor Element Array Circuit With Temperature-Stable Signal Readout
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Solution Overview
Problem
Conventional element array circuits face complexity in signal reading and processing due to significant variations in thermistor element resistance values with ambient temperature, leading to fluctuating gain in operational amplifiers and complex circuitry.
Innovation Solution
The element array circuit employs a control unit to maintain thermistor elements within a specified temperature range, acquire base and measured output values, and correct these values by adjusting potentials applied to wiring lines, thereby stabilizing the circuit operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If thermistor elements are used to detect electromagnetic waves, then measurement capability is provided, but resistance values vary significantly with ambient temperature causing circuit complexity
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the excitation voltage applied to the thermistor elements based on their resistance values. The control unit measures the resistance of each thermistor and modifies the voltage parameter accordingly, thereby maintaining stable output signals despite temperature-induced resistance variations, and eliminating the need for complex correction circuits.
Solution Approach 2:
The system implements self-service by having the control unit automatically measure the resistance of each thermistor element and adjust the excitation voltage in response. This automated feedback mechanism allows the circuit to self-correct for temperature variations without requiring external calibration or complex processing circuits, reducing overall system complexity.
2Power
If operational amplifiers are used to amplify signals from thermistor elements, then signal amplification is achieved, but gain fluctuates greatly due to ambient temperature influence
Solution Approach 1:
The patent applies preliminary action by measuring the resistance of each thermistor element before signal amplification and pre-adjusting the excitation voltage to compensate for expected temperature effects. This preliminary compensation ensures that the subsequent amplification stage receives a stable input signal, preventing gain fluctuations and eliminating the need for complex temperature compensation circuits in the amplifier stage.
3Measurement precision
If complex circuitry is used to correct temperature fluctuations, then measurement accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent implements feedback by having the control unit continuously monitor the resistance values of the thermistor elements and dynamically adjust the excitation voltage in response to measured changes. This closed-loop feedback mechanism maintains measurement accuracy by compensating for temperature effects in real-time, while keeping the correction circuitry simple through automated control rather than complex hardware designs.
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 approach reduces the complexity of signal processing by stabilizing thermistor element resistance values, ensuring accurate and efficient electromagnetic wave measurement across varying temperatures.
Implementation Method 1
infrared-sensitive resistors, such as thermistor elements, the resistance values of which vary in accordance with temperature changes
Implementation Method 2
supplying a current to the first thermistor elements to heat the first thermistor elements
Data Source
AI summary
An element array circuit includes a row line, a column line, a thermistor element connected to the row and column lines, power supplies connected to the row line, and control units connected to the row and column lines. A control unit maintains the thermistor element at a temperature within a specified range, acquires a base output value output via the column line, acquires a measured output value output via the column line, and obtains a difference between the measured output value and the base output value.