Raman Probe Optical Filters for Signal Purity
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Solution Overview
Problem
Current Raman spectroscopy systems face challenges in delivering laser light and collecting Raman signals due to space limitations in portable systems and signal distortions from Amplified Spontaneous Emission (ASE), as well as fluorescence and Raleigh and Raman scatterings introduced by optical fibers.
Innovation Solution
An improved Raman spectroscopy system with a Raman probe that separates the pump source from the Raman signal, filters out ASE, fluorescence, and Raleigh and Raman scatterings, and allows for three modes of use: maintaining distance with a conical standoff, manual distance control, and direct insertion of a specimen vial, using optical elements and filters to enhance signal quality and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If optical fibers are used to deliver laser light and collect Raman signals remotely, then space limitations are reduced and remote measurement is enabled, but fluorescence and Raleigh and Raman scatterings are introduced into the system
Solution Approach 1:
The patent extracts and removes the harmful fluorescent and scattered signals generated by optical fibers through the use of spectral filters. The filter selectively transmits the Raman signal while blocking the fluorescent background and Rayleigh scattering, thereby eliminating the harmful effects introduced by fiber optic delivery
Solution Approach 2:
The patent introduces an optical filter as an intermediary element between the optical fiber and the detector. This intermediary component mediates the interaction by allowing the desired Raman signal to pass through while blocking the harmful fluorescent and scattered light, thus resolving the contradiction between using fibers for remote delivery and avoiding fiber-generated interference
2Ease of manufacture
If ASE background from laser sources is present in the system, then laser light delivery is simplified, but signal distortion and reduced measurement precision occur
Solution Approach 1:
The patent converts the harmful ASE background into a beneficial filtering opportunity. By using a spectral filter that blocks the ASE wavelength range while transmitting the Raman signal, the system transforms the problematic ASE emission into a defined spectral region that can be easily filtered out, thereby improving signal quality without complicating the laser delivery system
Solution Approach 2:
The patent introduces a spectral filter as an intermediary component that selectively transmits the Raman signal while blocking the ASE background from the laser source. This intermediary element resolves the contradiction by maintaining simple laser delivery while eliminating signal distortion through wavelength-selective filtering
3Measurement precision
If multiple filtering operations are performed to remove unwanted signals, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple filtering functions into a single integrated optical filter component. This single filter simultaneously blocks ASE background, Rayleigh scattering, and fluorescent signals while transmitting the Raman signal, thereby achieving high signal quality without the complexity of multiple separate filtering stages
Solution Approach 2:
The patent employs a universal optical filter that performs multiple filtering functions in one component. The filter is designed to block multiple types of unwanted signals (ASE, Rayleigh scattering, fluorescence) across different wavelength ranges while transmitting the Raman signal, thus achieving comprehensive signal purification with a single multi-functional element
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 system effectively filters out unwanted signals and allows for precise identification and characterization of specimens, improving signal quality and safety in portable and remote applications.
Implementation Method 1
a first filter for receiving light from the first optical fiber and adapted to pass the laser excitation light and to block spurious signals associated with the light
Implementation Method 2
the second filter is further configured so that when the second filter receives the Raman signal from the focusing apparatus, the second filter filters out unwanted laser excitation light before directing the Raman signal to a second optical fiber
Implementation Method 3
focusing apparatus for receiving the light from the second filter, focusing the light on the specimen so as to generate the Raman signal
Implementation Method 4
a first optical fiber for receiving laser excitation light from a light source and transmitting the same
Data Source
AI summary
Disclosed herein are Raman probes that include: (a) a first optical fiber for receiving laser excitation light from a light source and transmitting the same; (b) a first filter for receiving light from the first optical fiber and adapted to pass the laser excitation light and to block spurious signals associated with the light; (c) a second filter for receiving light from the first filter and adapted to direct the light toward a specimen; and (d) focusing apparatus for receiving the light from the second filter, focusing the light on the specimen so as to generate the Raman signal, and returning the Raman signal to the second filter. The second filter is further configured so that when the second filter receives the Raman signal from the focusing apparatus, the second filter filters out unwanted laser excitation light before directing the Raman signal to a second optical fiber.