Radiation Thermometer Using Dual Fields of View for Background Interference

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing radiation thermometers struggle to accurately measure the temperature of a target region when non-target objects or background objects emit infrared rays that interfere with the measurement, leading to inaccuracies, especially when the target region has low emissivity or is partially obscured.

Innovation Solution

The use of two infrared detectors with different measurement visual fields and configurations, such as varying viewing angles, distances, or detectable wavelength bands, to detect and calculate the temperature of the target region by canceling out the effects of non-target objects and background interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single infrared detector with a fixed measurement visual field is used, then the device structure is simple, but the measurement accuracy deteriorates when non-target objects or background objects emit infrared rays that interfere with the measurement

Engineering Contradiction:

Improvedevice structureVSAvoidtemperature measurement accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The measurement visual field is segmented into multiple sub-fields by dividing the detector array into multiple detection elements, each sensitive to infrared rays from specific angular regions. This allows the system to separately measure radiation from the target region and from non-target objects/background, enabling accurate temperature measurement even when interference is present.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If the measurement visual field is narrowed to include only the measurement target region, then the temperature measurement accuracy improves, but the adaptability deteriorates when the measurement target region is very small or located at the bottom of a deep hole

Engineering Contradiction:

Improvetemperature measurement accuracyVSAvoidmeasurement range adaptability

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The measurement visual field is made dynamically adjustable through electronic control of the detector array's sensitive regions. The system can adaptively select different measurement regions and angular fields of view to match various target sizes and positions, maintaining both accuracy and adaptability across diverse measurement scenarios.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If infrared rays from the background pass through the measurement target region and incident on the infrared sensor, then the measurement can be performed, but the measurement accuracy significantly deteriorates when the measurement target object has low emissivity

Engineering Contradiction:

Improvemeasurement capabilityVSAvoidtemperature measurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The detection system is segmented to distinguish between infrared rays originating from the target region and those passing through from the background. By measuring radiation from multiple angular directions, the system can isolate the target's emitted radiation even when the target has low emissivity, maintaining measurement accuracy.

Inventive Principle:

Principle #1Segmentation

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

Accurate temperature measurement of the target region is achieved by eliminating the influence of non-target objects and background changes, regardless of temporal variations or positional gradients.

Implementation Method 1

measures a temperature of a measurement target region in an object by infrared rays emitted from the measurement target region

Methodology Applied

Scientific EffectInfrared radiation detection: Infrared Radiation

Implementation Method 2

receives infrared rays emitted from a measurement target region by an infrared sensor

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Data Source

PatentEP4707759A1Radiation thermometer, temperature measurement method, and temperature measurement program

Publication Date: 2026.03.11 HORIBA LTD

Figure 1
Figure 2
Figure 3

AI summary

A radiation thermometer 100 includes two infrared detectors 1 and 1' and a temperature calculator 2. The infrared detectors 1 and 1' each have a predetermined measurement visual field and detect the amount of infrared rays incident from the measurement visual field. The temperature calculator 2 calculates the temperature of a measurement target region Xa based on the amounts of infrared rays detected by the respective infrared detectors 1 and 1'. The measurement target region Xa is included in the measurement visual fields of the respective infrared detectors 1 and 1', and the sizes of the respective measurement visual fields are set to be different from each other with respect to the measurement target region Xa.