Ultraviolet Transmittance Member Temperature Measurement

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Solution Overview

Problem

Existing temperature measurement methods for ultraviolet light transmittance members, such as calcium fluoride, are ineffective due to their high transparency across a wide range of wavelengths, including infrared, making non-contact methods like thermovision unusable and contact methods impractical as they obstruct light and laser paths, leading to challenges in accurately measuring temperature changes that affect mechanical strength.

Innovation Solution

A temperature measurement method and device using a spectroscopic unit to detect ultraviolet light transmission and derive the temperature of the ultraviolet light transmittance member based on its absorption edge wavelength, allowing for accurate temperature monitoring without interfering with light or laser paths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If non-contact temperature measurement (thermovision) is used, then measurement convenience is improved, but measurement feasibility deteriorates because the ultraviolet light transmittance member is transparent in the infrared region

Engineering Contradiction:

Improvemeasurement convenienceVSAvoidmeasurement feasibility

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent changes the measurement parameter from infrared radiation detection (thermovision) to ultraviolet light absorption edge wavelength detection. By measuring the shift in absorption edge wavelength caused by temperature changes, the system can accurately measure temperature without being blocked by the transparency of the member in the infrared region.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If contact temperature measurement (thermocouple) is used, then measurement feasibility is improved, but light transmission is blocked by the fixing member

Engineering Contradiction:

Improvemeasurement feasibilityVSAvoidlight path obstruction

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the mechanical contact measurement system (thermocouple with fixing member) with an optical measurement system. By using ultraviolet light transmission characteristics to measure temperature, the system eliminates the need for physical contact and fixing members that would block light paths.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If contact temperature measurement is used, then measurement feasibility is improved, but laser light entry is blocked by the fixing member

Engineering Contradiction:

Improvemeasurement feasibilityVSAvoidlaser path obstruction

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the mechanical contact measurement system with an optical measurement system that uses ultraviolet light transmission. This substitution eliminates the fixing member that would block laser light entry, allowing the laser to pass through the member without obstruction while temperature is measured optically.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Device complexity

If temperature measurement is not performed, then device complexity is reduced, but mechanical strength deterioration occurs due to undetected temperature rise

Engineering Contradiction:

Improvemeasurement system complexityVSAvoidmechanical strength

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The patent utilizes the inherent optical properties of the ultraviolet light transmittance member itself (its absorption edge wavelength characteristics) as the measurement indicator. The member's own material characteristics serve as the temperature sensor, eliminating the need for separate complex measurement systems while enabling early detection of temperature-induced mechanical strength deterioration.

Inventive Principle:

Principle #25Self-service

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

Enables accurate and non-invasive temperature measurement of ultraviolet light transmittance members, preventing damage from temperature-induced mechanical strength declines by detecting temperature increases before they cause slip or structural changes.

Implementation Method 1

detecting ultraviolet light transmitted through the ultraviolet light transmittance member using a spectroscopic measurement unit, and obtaining an absorption edge wavelength of the ultraviolet light transmittance member

Methodology Applied

Scientific EffectAbsorption spectroscopy: Absorption Spectroscopy

Implementation Method 2

deriving a temperature of the ultraviolet light transmittance member on the basis of the obtained absorption edge wavelength

Methodology Applied

Scientific EffectThermal shift of absorption edge: Absorption (EM radiation)

Data Source

PatentUS9671290B2Temperature measurement method for ultraviolet light transmittance member, temperature measurement device for ultraviolet light transmittance member, and light source device

Publication Date: 2017.06.06 NIKON CORP

AI summary

There is provided a temperature measurement method for measuring a temperature of an ultraviolet light transmittance member transmitting ultraviolet light. The method includes: detecting ultraviolet light transmitted through the ultraviolet light transmittance member using a spectroscopic measurement unit, and obtaining an absorption edge wavelength of the ultraviolet light transmittance member; and deriving a temperature of the ultraviolet light transmittance member on the basis of the obtained absorption edge wavelength.