Thermocouple Signal Gain Feedback for Stable Temperature Readings
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Solution Overview
Problem
Thermocouple signals are susceptible to noise due to low signal levels and high impedance, leading to inaccurate and unstable temperature readings, particularly in medical procedures where precise temperature measurements are critical.
Innovation Solution
A circuit comprising a multiplexer, amplification circuit, and processor that processes signals from multiple thermocouples, selects a predetermined characteristic, feeds it back as a feedback signal to adjust the amplification gain, ensuring all output signals have consistent amplitudes, thereby reducing noise and stabilizing temperature readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If thermocouple signals are directly processed without calibration, then device complexity is reduced, but measurement precision deteriorates due to noise susceptibility from low signal levels and high impedance
Solution Approach 1:
The patent implements a feedback mechanism where the processor monitors the amplitude of thermocouple signals and dynamically adjusts the gain of the amplification circuit. The control circuitry receives feedback about signal characteristics and automatically calibrates the amplification level, eliminating the need for manual calibration while maintaining high measurement precision through adaptive signal optimization.
2Measurement precision
If manual calibration is performed for each thermocouple, then measurement precision is improved, but ease of operation deteriorates due to time-consuming calibration procedures
Solution Approach 1:
The system performs self-calibration automatically without requiring user intervention. The processor analyzes the amplitude characteristics of thermocouple signals and autonomously adjusts amplification gains through feedback control. This self-calibrating mechanism eliminates manual calibration steps while ensuring accurate temperature measurements, making the device equally convenient for both novice and experienced users.
3Measurement precision
If signal amplification is increased to improve low signal levels, then measurement precision is improved, but object-generated harmful factors worsen due to amplified noise from high impedance
Solution Approach 1:
The patent employs dynamic gain adjustment where the amplification level is not fixed but adapts in real-time based on feedback from the processor. The control circuitry continuously monitors signal characteristics and adjusts the amplification circuit gain dynamically, optimizing the balance between signal detectability and noise amplification. This dynamic approach allows the system to amplify weak thermocouple signals while minimizing noise through adaptive control.
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
The solution effectively matches and stabilizes signals from multiple thermocouples, providing accurate and consistent temperature readings by processing all signals through the same circuit, reducing noise and inaccuracy caused by signal mismatch and temperature variations.
Implementation Method 1
an amplification circuit having a second output and a second input connected to the first output of the multiplexer and configured to amplify signals in the signal groupings corresponding to the plurality of analog input signals with a selected gain so as to generate respective amplified analog signals at the second output
Implementation Method 2
control circuitry configured to select a predetermined characteristic of the respective amplified analog signals from an initial signal grouping, to feed the predetermined characteristic back via the third output for input to the multiplexer as the analog feedback signal, to select a subsequent predetermined characteristic of the respective amplified analog signals from a subsequent signal grouping, and to adjust the gain of the amplification circuit so that the analog feedback signal and the subsequent predetermined characteristic have the same amplitude
Data Source
AI summary
Apparatus, including a multiplexer, having a first output and multiple first inputs receiving analog input signals and an analog feedback signal and cycling through and selecting the signals for transfer in sequential signal groupings to the first output. The apparatus also includes an amplification circuit, having a second output and a second input connected to the multiplexer first output, that amplifies signals corresponding to the analog input signals with a selected gain so as to generate respective amplified analog signals at the second output. Circuitry selects a characteristic of the respective amplified analog signals from an initial signal grouping, feeds the characteristic back for input to the multiplexer as the analog feedback signal, selects a subsequent characteristic of the respective amplified analog signals from a subsequent signal grouping, and adjusts the amplification circuit gain so that the analog feedback signal and the subsequent characteristic have the same amplitude.