State Identification Device Using Delayed Fluorescence

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Solution Overview

Problem

Conventional methods for determining the state of an object using light do not effectively examine the state of the object.

Innovation Solution

A state determination device that includes an irradiation unit to irradiate the object with excitation light, a measurement unit to measure light emission data generated with a delay, and a determination unit to determine the object's state by comparing the measured data with reference data.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional light-based determination methods (absorption spectroscopy, laser-induced breakdown spectroscopy) are used, then substance composition can be determined, but the state of the object cannot be effectively examined

Engineering Contradiction:

Improvestate determination accuracyVSAvoidobject state information

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The invention changes the measurement parameter from absorption spectrum or plasma light spectrum to delayed fluorescence light emission spectrum. By measuring the light emission spectrum that occurs after excitation light irradiation, the system can determine both substance composition and object state (such as temperature, stress, or phase changes) that affect the fluorescence characteristics.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses periodic excitation light irradiation followed by measurement of the delayed fluorescence emission. The excitation light is applied in pulses or cycles, allowing the system to capture the time-resolved fluorescence emission that contains state information about the object.

Inventive Principle:

Principle #19Periodic action

2Measurement precision

If excitation light is irradiated for a relatively long time period (several tens of seconds), then delayed fluorescence spectrum and fluorescence lifetime can be measured, but measurement time is extended

Engineering Contradiction:

Improvefluorescence lifetime measurement accuracyVSAvoidmeasurement time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The invention employs periodic or pulsed excitation light irradiation instead of continuous long-duration irradiation. By using short pulses of excitation light followed by measurement of the decay fluorescence, the system can determine fluorescence lifetime and object state much more quickly, reducing measurement time from several tens of seconds to much shorter durations.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The invention performs preliminary excitation with short light pulses that prepare the fluorescent molecules in the excited state, then immediately measures the decay. This preliminary action approach allows rapid state determination without requiring prolonged irradiation, thus reducing measurement time while maintaining measurement precision.

Inventive Principle:

Principle #10Preliminary action

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 determination of the object's state by utilizing light emission data, specifically delayed fluorescence and phosphorescence, allowing for non-contact, non-destructive, and non-invasive assessment.

Implementation Method 1

measures light emission data of light emission from the object to be inspected, which is generated with a delay with respect to the irradiation with the excitation light

Methodology Applied

Scientific EffectDelayed fluorescence: Fluorescence

Implementation Method 2

the light emission data of light emission from the object to be inspected, which is generated with a delay with respect to the irradiation with the excitation light

Methodology Applied

Scientific EffectPhosphorescence: Phosphorescence

Data Source

PatentUS12313547B2State identification device, state identification method, and state identification program

Publication Date: 2025.05.27 THE UNIV OF TOKYO

AI summary

There are provided a state determination device, a state determination method, and a state determination program capable of determining a state of an object to be inspected. A state determination device 10 includes an irradiation unit 12 which irradiates an object to be inspected with excitation light under a predetermined irradiation condition, a measurement unit 13 which measures light emission data of light emission from the object to be inspected, which is generated with a delay with respect to the irradiation with the excitation light, and a determination unit 15 which determines a state of the object to be inspected by checking the light emission data against light emission data of light emission from the object to be inspected, which is measured in the case where the excitation light is emitted under an irradiation condition common to the light emission data for each state of a substance constituting the object to be inspected.