Pyrometer Calibration Apparatus with Transparent Blocking Plate
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Solution Overview
Problem
Existing pyrometer calibration apparatuses face challenges in accurately calibrating low-temperature measurements due to contamination and inefficiencies in blocking foreign substances, leading to temperature deviations and prolonged calibration times.
Innovation Solution
A calibrating apparatus with a blackbody and a transparent blocking plate made of BaF2, CaF2, or Ge compounds, which transmits long wavelengths of 5 μm to 20 μm and minimizes foreign substance introduction by creating a separation space for enhanced heat exchange, allowing rapid stabilization of the blackbody temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking plate is provided at the light output port to prevent foreign substance introduction, then contamination is reduced, but the radiant energy transmission is blocked and thermal efficiency deteriorates
Solution Approach 1:
A transparent blocking plate made of special material (BaF2, CaF2, or Ge compounds) is used as an intermediary that simultaneously performs two functions: blocking foreign substances from entering the radiant space while transmitting long wavelength radiant energy (5-20 μm). This resolves the contradiction by finding a material that has both blocking and transmitting properties.
Solution Approach 2:
The patent changes the material parameter of the blocking plate from conventional materials to specific compounds (BaF2, CaF2, Ge) that have unique optical properties. These materials are transparent to long wavelength infrared radiation while physically blocking contaminants, thus changing the transmission parameter to resolve the contradiction between protection and energy efficiency.
2Measurement precision
If the blackbody is heated to reference temperature for calibration, then calibration accuracy is achieved, but calibration time is prolonged
Solution Approach 1:
A separation space is extracted and created between the light output wall and the light output wall protecting cover. This separation space functions as a thermal passage that extracts heat from the heating system and rapidly transfers it to the blackbody, enabling faster temperature stabilization without compromising calibration accuracy.
Solution Approach 2:
The separation space creates a thermal convection current that acts similarly to pneumatic/hydraulic flow, enabling rapid heat circulation and transfer to the blackbody. This thermal flow mechanism accelerates the heating process while maintaining the required reference temperature for accurate calibration.
3Loss of energy
If the light output port is left open for radiant energy transmission, then thermal efficiency is maintained, but foreign substances are introduced into the blackbody
Solution Approach 1:
The transparent blocking plate serves as a mediator positioned at the light output port that selectively interacts with different types of entities: it blocks foreign substances (solid particles) while allowing radiant energy (electromagnetic waves in 5-20 μm wavelength range) to pass through. This resolves the contradiction by differential transmission based on physical properties.
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 apparatus effectively calibrates pyrometers for low-temperature measurements by preventing contamination and reducing calibration time, ensuring accurate temperature readings while maintaining thermal efficiency.
Implementation Method 1
configured to transmit a long wavelength of approximately 5 μm to approximately 20 μm
Implementation Method 2
a blackbody including a radiant space from which radiant energy is radiated
Implementation Method 3
creating a separation space for enhanced heat exchange, allowing rapid stabilization of the blackbody temperature
Data Source
AI summary
Disclosed is a calibrating apparatus which is adapted to remove a measurement deviation of a pyrometer, and more particularly, to an apparatus for calibrating a pyrometer, which calibrates a reference value so as to remove a deviation in a temperature measured in a pyrometer. The apparatus for calibrating a pyrometer includes a blackbody including a radiant space from which radiant energy is radiated, a body housing configured to receive the blackbody therein and including a light output wall having a light output port connected with the radiant space, a light output wall protecting cover comprising a transparent blocking plate disposed at a position opposite to the light output port so as to transmit a long wavelength of approximately 5 μm to approximately 20 μm may and configured to be coupled with the light output wall of the body housing, and a fixing member configured to fix the light output wall protecting cover to the light output wall of the body housing.