Radiation Temperature Measuring Device Reflective Polarizing Plate

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Solution Overview

Problem

Conventional radiation temperature measuring devices using infrared sensors face challenges in accurately measuring surface temperatures due to high reflectance of targets, as reflected electromagnetic waves interfere with measurements, and existing solutions like polarizing plates are ineffective in the infrared band, particularly in wavelengths from 5 to 15 μm.

Innovation Solution

A radiation temperature measuring device incorporating a reflective polarizing plate that reflects one polarized component and transmits or absorbs the perpendicular component, allowing the infrared sensor to detect the polarized wave in the infrared band, thereby reducing the impact of reflectance and maintaining measurement accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional infrared sensors are used to measure temperature, then temperature measurement can be performed contactlessly, but measurement accuracy deteriorates due to reflected electromagnetic waves from targets with non-zero reflectance

Engineering Contradiction:

Improvetemperature measurement accuracyVSAvoidreflected electromagnetic wave interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

A polarizing plate is introduced as an intermediary component between the infrared sensor and the measurement target. This polarizing plate selectively transmits electromagnetic waves with specific polarization states while blocking others, thereby separating the desired thermal radiation signal from reflected electromagnetic wave interference and improving measurement accuracy

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If polarizing plates are used to block reflected electromagnetic waves, then reflection interference is reduced, but the solution is ineffective in the infrared wavelength band (5-15 μm) where radiation temperature measurement is optimal

Engineering Contradiction:

Improvereflected electromagnetic wave interferenceVSAvoidmeasurement effectiveness in optimal wavelength band

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The invention changes the parameter of the polarizing plate's wavelength characteristics to be effective in the infrared band (5-15 μm). By selecting or designing a polarizing plate with appropriate infrared transmission characteristics, the system maintains both reflection interference reduction and effectiveness in the optimal temperature measurement wavelength range

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If emissivity correction is applied to account for reflectance, then measurement can proceed with non-ideal targets, but the correction is only valid when there is no original light source reflected by the target

Engineering Contradiction:

Improveapplicability to actual targets with non-zero reflectanceVSAvoidmeasurement accuracy under conditions with reflected light sources

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The polarizing plate acts as a mediator that physically blocks reflected electromagnetic waves before they reach the sensor, making the measurement environment inherently free from reflection interference. This eliminates the need for complex emissivity correction calculations and ensures accuracy even when original light sources are present in the field of view

Inventive Principle:

Principle #24Intermediary (Mediator)

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 device achieves high output detection in the infrared wavelength band optimal for radiation temperature measurement, effectively preventing reductions in measurement accuracy even with high reflectance targets, by utilizing a reflective polarizing plate to minimize the influence of reflected electromagnetic waves.

Implementation Method 1

Methodology Applied

Scientific EffectPolarization: Polarisation

Implementation Method 2

A radiation temperature measuring device incorporating a reflective polarizing plate that reflects one polarized component... effectively preventing reductions in measurement accuracy even with high reflectance targets, by utilizing a reflective polarizing plate to minimize the influence of reflected electromagnetic waves

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 3

The temperature of the target is calculated from a measured value of the radiated energy. The calculation of the temperature of the target uses, for example, Stefan-Boltzmann's Law of black body radiation

Methodology Applied

Scientific EffectBlack body radiation: Thermal Radiation

Data Source

PatentUS11573128B2Radiation temperature measuring device

Publication Date: 2023.02.07 ASAHI KASEI KOGYO KABUSHIKI KAISHA

AI summary

An object of the present invention is to provide a radiation temperature measuring device capable of preventing reduction in the accuracy of temperature measurement due to an electromagnetic wave reflected by a measurement target. A radiation temperature measuring device includes a reflective polarizing plate configured to reflect a polarized wave of one direction in an electromagnetic wave radiated from an object to be measured and transmit or absorb a polarized wave of a direction perpendicular to the one direction and an infrared sensor configured to detect the polarized electromagnetic wave of the one direction reflected by the reflective polarizing plate.