Endoscope Temperature Compensation Circuit Design
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Solution Overview
Problem
Conventional endoscope systems face challenges in maintaining signal precision due to temperature dependencies of sensors, requiring complex temperature correction processes that increase processing load and compatibility issues with different processors.
Innovation Solution
Incorporating a temperature compensation circuit with a differential amplifying section and a temperature sensing section, including a resistance connected in series to a temperature sensing element, which generates a reference voltage to amplify sensor signals and correct for temperature variations, thereby reducing signal fluctuations and ensuring precision without requiring temperature correction in the processor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature correction is performed in the processor, then signal precision is maintained, but processing load increases and compatibility with different processors becomes problematic
Solution Approach 1:
The temperature correction function is extracted from the processor and relocated to a dedicated temperature compensation circuit in the endoscope. This separates the temperature compensation task from the main processing system, reducing the processor's burden while maintaining signal precision through specialized hardware designed solely for this purpose.
Solution Approach 2:
A dedicated temperature compensation circuit is introduced as an intermediary component between the sensor and the processor. This intermediate circuit handles temperature correction locally, preventing temperature-dependent signal variations from reaching the processor while avoiding the need for complex processor-based correction algorithms.
2Measurement precision
If temperature correction is performed in the processor, then signal precision is maintained, but compatibility with various processors deteriorates
Solution Approach 1:
The temperature correction functionality is extracted from the processor system entirely and implemented as an independent temperature compensation circuit within the endoscope. This extraction eliminates the dependency between processor capabilities and temperature correction performance, allowing the endoscope to maintain signal precision regardless of which processor is used.
Solution Approach 2:
The temperature compensation circuit is designed as a universal solution that operates independently of the processor type. By implementing temperature correction in the endoscope itself rather than relying on processor-specific algorithms, the system achieves broad compatibility with various processors while maintaining consistent signal precision across different configurations.
3Device complexity
If a simple amplifying circuit is used, then device complexity is reduced, but temperature dependency of sensor signals increases
Solution Approach 1:
The temperature sensing element and the signal amplifying circuit are merged into a single integrated temperature compensation circuit. This combination allows the circuit to simultaneously perform signal amplification and temperature compensation functions, maintaining signal stability against temperature variations without requiring separate complex systems for each function.
Solution Approach 2:
The circuit utilizes the temperature-dependent resistance characteristics of the sensing element to dynamically adjust amplification parameters based on temperature conditions. By changing circuit parameters in response to temperature variations, the system maintains stable signal output despite environmental temperature changes, achieving temperature compensation through parameter adaptation rather than complex control logic.
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 solution enables precise temperature compensation of sensor outputs, reducing processing load and ensuring compatibility with various processors, while maintaining signal accuracy and stability across different temperature conditions.
Implementation Method 1
The various sensors as above have temperature dependency, so that it is necessary to perform temperature correction of the output signals
Data Source
AI summary
An endoscope includes a sensor, and a temperature compensation circuit configured to perform temperature compensation of an output signal of the sensor, in a distal end portion. The temperature compensation circuit includes a differential amplifying section configured to amplify an output signal of the sensor, and a temperature sensing section in which a resistance is connected in series to a parallel connection portion of a temperature sensing element and a resistance.