Temperature-Compensated Signal Reading Circuit for Radiation Imaging
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Solution Overview
Problem
Existing radiation image capturing apparatuses face challenges in achieving high-accuracy imaging due to temperature-dependent amplifier circuit characteristics and the need for space-consuming heat dissipation methods, which hinder compactness and stability.
Innovation Solution
A radiation image capturing apparatus with a solid-state detector using a sensor substrate with Thin Film Transistors (TFTs) and a photoelectric conversion layer made of amorphous selenium, coupled with a temperature-compensating signal reading circuit that includes a temperature sensor and a variable gain amplifier to adjust gain based on detected temperature, ensuring consistent image quality across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat pipe is used to release heat from the reading IC, then the reading IC can dissipate heat, but the temperature of the reading IC still varies with ambient temperature and the apparatus size increases
Solution Approach 1:
The patent replaces the mechanical heat pipe system with an electronic temperature compensation system. Instead of physically removing heat through a heat pipe, the invention uses a temperature sensor to detect ambient temperature changes and a compensation circuit to electronically adjust the amplifier circuit's reference current, thereby maintaining stable output characteristics without requiring additional thermal management hardware.
Solution Approach 2:
The reading IC itself generates the reference current that is used for temperature compensation. The compensation circuit uses the temperature sensor to adjust this self-generated reference current, allowing the system to compensate for its own temperature drift without requiring external active cooling or heating systems.
2Temperature
If a Peltier element is used to cool the reading IC, then the reading IC remains at constant temperature, but heat release space is still required and the apparatus size increases
Solution Approach 1:
The patent replaces the mechanical Peltier element cooling system with an electronic temperature compensation system. Instead of using active thermoelectric cooling that requires heat dissipation space, the invention uses a temperature sensor to detect ambient temperature and electronically compensates for temperature effects by adjusting the reference current in the amplifier circuit, eliminating the need for physical cooling hardware.
3Temperature
If a compensation circuit is used to compensate for temperature dependency of the amplifier circuit, then temperature compensation is attempted, but high-accuracy compensation is difficult because temperature dependency is nonlinear
Solution Approach 1:
The patent implements a feedback-based temperature compensation system. A temperature sensor continuously monitors the ambient temperature, and this temperature information is fed back to a compensation circuit that adjusts the reference current of the amplifier circuit accordingly. This closed-loop feedback mechanism enables dynamic compensation for nonlinear temperature dependencies, maintaining high measurement precision across varying temperatures.
Solution Approach 2:
The patent changes the electrical parameters of the amplifier circuit (specifically the reference current) based on detected temperature conditions. By dynamically adjusting the reference current parameter in response to temperature sensor readings, the system compensates for nonlinear temperature effects and maintains stable output characteristics across different operating temperatures.
4Adaptability or versatility
If the amplifier circuit operates at varying temperatures, then the apparatus can operate in different environments, but the output characteristics vary and high-accuracy imaging is hindered
Solution Approach 1:
The patent uses a temperature sensor to continuously monitor the operating temperature and feeds this information back to a compensation circuit. The compensation circuit dynamically adjusts the reference current of the amplifier circuit based on the detected temperature, enabling the system to maintain stable output characteristics across different environmental conditions while preserving high measurement precision.
Solution Approach 2:
The patent dynamically changes the electrical parameters (reference current) of the amplifier circuit in response to temperature variations. This parameter adjustment allows the amplifier to adapt to different environmental temperatures while maintaining consistent output characteristics, thereby enabling versatile environmental operation without sacrificing imaging 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
The solution enables the acquisition of high-accuracy radiation image information irrespective of ambient temperature, while reducing the size and complexity of the apparatus, ensuring stable and precise imaging.
Implementation Method 1
a photoelectric conversion layer made of amorphous selenium
Data Source
AI summary
The invention relates to a radiation image capturing apparatus that includes a signal reading circuit for reading an image signal from a sensor substrate. The signal reading circuit includes a charge detecting circuit and a temperature sensor for detecting the temperature of the charge detecting circuit, and controls the gain of a variable gain amplifier of the charge detecting circuit based on the detected temperature.