Movable Shutter Temperature Calibration for Infrared Sensors
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Solution Overview
Problem
Conventional temperature calibration methods for infrared thermal image cameras using fixed black bodies are inadequate and require improvement for more precise temperature measurement.
Innovation Solution
A temperature calibration method involving a temperature measuring device with a movable shutter module, an electric control driver, and an electric control heater, which blocks and exposes temperature-measuring viewing angles to measure and calibrate non-contacting temperature sensing modules using black body temperature information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed black body is used for temperature calibration, then the calibration process is simple, but the measurement precision and reliability are insufficient
Solution Approach 1:
The patent employs a movable shutter structure that can dynamically switch between different positions to alternately block and expose the temperature sensing module. This dynamic mechanism allows the system to transition between calibration mode (shutter blocked) and measurement mode (shutter exposed), enabling precise temperature calibration without requiring a complex fixed black body structure.
Solution Approach 2:
The invention utilizes an electric control heater to change the temperature parameter of the black substance on the shutter structure. By controlling the heater to generate specific temperatures (e.g., 37°C for body temperature calibration), the system creates known temperature references that improve measurement precision without needing external black body equipment.
2Measurement precision
If a movable shutter structure with heater is used for calibration, then the temperature measurement precision is improved, but the device complexity increases
Solution Approach 1:
The movable shutter structure serves multiple functions: it acts as an optical chopper to block ambient radiation, contains the black substance for temperature reference, and integrates the electric heater for active temperature control. This multi-functionality reduces the need for separate calibration equipment, thereby improving precision without proportionally increasing overall device complexity.
Solution Approach 2:
The system uses its own shutter structure and integrated heater to generate the black body reference temperature, rather than requiring external calibration equipment. The temperature sensing module calibrates itself by measuring the known temperature of the black substance on the shutter, enabling self-calibration and reducing dependency on external devices.
3Measurement precision
If the shutter blocks the temperature-measuring viewing angle, then the black body temperature can be measured accurately, but the operational time for actual measurement is reduced
Solution Approach 1:
The movable shutter operates periodically, alternating between blocked and exposed positions. During the blocked position, the system measures black body temperature for calibration. During the exposed position, the system measures target object temperature. This periodic switching enables both calibration and measurement functions to be performed systematically without requiring separate procedures, optimizing the use of time.
Solution Approach 2:
The system performs black body temperature measurement and calibration in advance (when shutter is blocked) before actual target measurement (when shutter is exposed). By completing the calibration process beforehand using the shutter's blocked position, the system ensures accurate temperature measurement for subsequent operations without losing time during actual measurement phases.
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 method allows for accurate calibration of temperature sensing modules by measuring black body temperature, enhancing the precision and reliability of temperature measurements in temperature measuring devices.
Implementation Method 1
an electric control heater disposed on the movable shutter structure, and the movable shutter structure includes a black substance for generating a predetermined heating temperature from being heated by the electric control heater
Implementation Method 2
measuring the predetermined heating temperature that is generated by the black substance of the movable shutter structure by the second non-contacting temperature sensing module
Data Source
AI summary
A temperature calibration method includes providing a temperature measuring device including a movable shutter module, and a first and a second non-contacting temperature sensing module, and a movable shutter structure of the movable shutter module includes a black substance for generating a predetermined heating temperature; moving the movable shutter structure to a first position by driving of the electric control driver, so as to completely block a first temperature-measuring viewing angle of the first non-contacting temperature sensing module and a second temperature-measuring viewing angle of the second non-contacting temperature sensing module by the black substance; measuring the predetermined heating temperature that is generated by the black substance by the second non-contacting temperature sensing module at the second temperature-measuring viewing angle so as to obtain black body temperature information of the black substance; and calibrating the first non-contacting temperature sensing module according to the black body temperature information.