A/D Converter Gain Correction via Temperature Measurement
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Solution Overview
Problem
Analog-to-digital (A/D) converters in imaging systems experience temperature-related gain fluctuations during imaging scans, leading to errors and lower image quality due to power cycling, which affects the temperature and gain of the converters.
Innovation Solution
Measuring the temperature of A/D converters during an imaging scan and correcting their gain based on the measured temperature, while using a heat sink to manage temperature changes and maintain a predetermined range, ensuring consistent gain values throughout the scan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If A/D converters are powered down to conserve electrical power, then energy consumption is reduced, but temperature fluctuations cause gain errors and lower image quality
Solution Approach 1:
The system performs preliminary actions by measuring the temperature of A/D converters and calculating gain correction factors before the imaging scan begins. This allows the gain to be corrected in advance based on the actual temperature conditions, ensuring accurate imaging without requiring the A/D converters to remain continuously powered on.
Solution Approach 2:
The system implements feedback by continuously monitoring the temperature of A/D converters and using this information to dynamically adjust and correct the gain values. This closed-loop approach ensures that temperature-induced variations in gain are compensated for, maintaining image quality while allowing power-saving mode operation.
2Stability of the object's composition
If A/D converters are powered up before imaging scan, then gain stability is improved, but time required for imaging is increased due to warm-up period
Solution Approach 1:
The system changes the approach from maintaining constant power supply to dynamically adjusting gain values based on temperature measurements. By accepting temperature variations and compensating through parameter adjustment rather than preventing temperature changes through continuous powering, the system eliminates the warm-up time requirement while maintaining gain stability.
3Use of energy by moving object
If temperature of A/D converters is allowed to vary, then power consumption is reduced, but gain accuracy deteriorates
Solution Approach 1:
The system converts the harmful effect of temperature-induced gain variations into a beneficial correction process. By measuring the actual temperature and calculating the corresponding gain correction factor, the system uses the temperature information itself to compensate for its adverse effects, allowing power-saving temperature variations while maintaining measurement accuracy.
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 improves image quality by maintaining consistent gain values, reduces errors, and enables power savings without compromising system readiness, thereby enhancing the performance and efficiency of imaging systems.
Implementation Method 1
A heat sink is engaged with a surface of the A/D converter for absorbing heat from the A/D converter
Data Source
AI summary
A method is provided for image detection. The method includes measuring a temperature of an analog-to-digital (A/D) converter of an imaging system during an imaging scan of an object, and correcting a gain of the A/D converter based on the measured temperature of the A/D converter.