Pulsed Laser Spectroscopy for Plastic Substance Identification
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Solution Overview
Problem
Existing methods for identifying substances and additives in plastics using spectroscopy have limited resolution and selectivity, making reliable identification challenging, especially in recycling applications where precise differentiation between chemically similar substances is necessary.
Innovation Solution
A device and method utilizing a pulsed laser with picosecond or shorter pulse durations for irradiating materials, allowing for improved spectral resolution and selectivity through fluorescence lifetime analysis, enabling more precise and reliable identification of plastics and their additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuously radiating lasers are used for irradiation, then the device operation is simple, but the spectral resolution and selectivity are low
Solution Approach 1:
The patent applies periodic action by using pulsed laser irradiation instead of continuous radiation. The laser emits light in periodic pulses with specific duration (nanosecond to femtosecond range), creating time-resolved spectral measurements that improve resolution and selectivity while maintaining operational simplicity through automated pulse timing control.
2Measurement precision
If pulsed laser with picosecond pulse duration is used, then spectral resolution and selectivity are improved, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pulse duration parameter of the laser in the nanosecond to femtosecond range. This parameter optimization enables high spectral resolution and selectivity for reliable substance identification, while the automated control systems manage the increased device complexity through standardized interfaces and integrated timing circuits.
3Measurement precision
If shorter pulse duration is used, then the signal-to-noise ratio increases, but the energy consumption increases
Solution Approach 1:
The patent applies continuity of useful action by using high repetition rate pulsed laser irradiation. Although individual pulses are short (nanosecond to femtosecond), the high repetition rate ensures continuous sampling and accumulation of signal, maintaining high signal-to-noise ratio while distributing energy consumption over time, thereby managing overall energy usage efficiently.
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 use of pulsed lasers with picosecond or shorter pulse durations enhances the spectral resolution and selectivity of spectroscopic analysis, improving the reliability and flexibility of substance identification, particularly in recycling plastics, allowing for better differentiation between chemically similar substances and increasing the signal-to-noise ratio.
Implementation Method 1
a laser for irradiating a sample of the material with light of at least one wavelength, a detector for detecting the light re-emitted by the sample
Implementation Method 2
the laser is a pulsed laser which has a pulse duration in the range of picoseconds or an even shorter pulse duration
Data Source
AI summary
The invention relates to a device (1) for identifying substances of a material by means of spectroscopy, comprising a laser (2) for irradiating a sample (3) of said material with light of at least one wavelength, a detector (6) for detecting the light re-emitted by the sample, and an analysis device for the spectroscopic analysis of the detected light, said laser being a pulsed laser having a pulse duration in the picosecond range or even shorter.