研究目的
To analyze the sensitivity of radiometers based on thermoresistive electrical equivalence and propose an efficient difference of temperature for best sensitivity-wise measurements.
研究成果
The CDT architecture presented an improvement compared to the classical CT architecture due to its independence to the room temperature. Sensitivity analysis indicates that only architecture with PTC sensor provides linear sensitivity for the PWM output.
研究不足
The CT architecture's sensitivity decreases with the increase of radiation in the analog output analysis and is dependent on room temperature, which is a limitation not present in the CDT architecture.
1：Experimental Design and Method Selection:
The study analyzes two main architectures: Constant Temperature (CT) and Constant Difference of Temperature (CDT) radiometers, employing PTC and NTC type sensors with analog voltage and pulse width modulated output signals.
2：Sample Selection and Data Sources:
Simulations were performed with parameters given in Table I, varying the environment temperature from ?20 to 40°C and several values of incident radiation.
3：List of Experimental Equipment and Materials:
Thermoresistive sensors (PTC and NTC types), Wheatstone bridge, operational amplifier, pulse width modulator.
4：Experimental Procedures and Operational Workflow:
The study involves simulating the response of radiometers to varying environmental temperatures and incident radiation levels, comparing the sensitivity of CT and CDT architectures.
5：Data Analysis Methods:
Sensitivity was evaluated using derived expressions for both architectures and sensor types, with results presented in graphs.
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