Optical Raman Probe Cap for Stray Light Noise Reduction
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Solution Overview
Problem
Stray light noise significantly affects the accuracy of optical Raman probe sensors, particularly in bioprocessing applications, due to ambient light sources like sunlight and interior lighting, which interferes with the sensitive Stokes Raman scattering signals.
Innovation Solution
A cap with a closed end and openings is attached to the tip of the optical Raman probe sensor, blocking stray light and optionally featuring a reflective surface to enhance the Raman scattering signal, constructed from materials that block wavelengths from 400 nm to 2000 nm, and can be permanently affixed or removable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ambient light blocking measures are implemented, then stray light noise is reduced, but device complexity increases
Solution Approach 1:
The probe is divided into functional segments: a light-blocking cap with selective openings, a tubular structure, and an optical sensor portion. This segmentation allows each component to address specific aspects of stray light reduction while maintaining overall system functionality.
Solution Approach 2:
A cap structure serves as an intermediary element between the ambient environment and the optical sensor. This cap with controlled openings acts as a mediator that selectively permits useful light while blocking harmful stray light, reducing noise without requiring complex internal filtering mechanisms.
2Measurement precision
If a cap with openings is added to block stray light, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The cap structure implements local quality by providing different properties in different regions: the closed end provides complete light blocking, the openings provide selective light passage, and the interior surface provides reflective enhancement. This localized functional differentiation improves measurement precision through targeted light management.
Solution Approach 2:
The reflective surface on the interior of the cap converts potentially harmful stray light that enters through the openings into beneficial additional signal light by reflecting it toward the sensor. This transforms a portion of the stray light problem into a signal enhancement opportunity, improving measurement precision.
3Use of energy by moving object
If a reflective surface is added to enhance signal, then signal intensity is improved, but manufacturing complexity increases
Solution Approach 1:
The reflective surface parameter is optimized to achieve signal enhancement while maintaining manufacturability. By controlling the reflectivity parameter and the geometric parameters of the cap, the system achieves 2-100x signal enhancement through simple structural modifications rather than complex manufacturing processes.
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 cap effectively reduces stray light noise by up to 90%, enhancing signal consistency and accuracy, allowing for controlled measurement tolerances and compliance with standard probe diameters.
Implementation Method 1
A cap having a closed end and one or more openings is attached to the tip of an optical Raman probe sensor. The cap serves to block stray light noise from entering the tip of the sensor.
Implementation Method 2
In some embodiments, a reflective surface may be included on the interior surface of the closed end of the cap. This reflective surface may reflect Raman scattering light toward the tip, enhancing the received signal by a factor of 2 to 100.
Data Source
AI summary
A cap having a closed end and one or more openings is attached to the tip of an optical Raman probe sensor. The cap serves to block stray light noise from entering the tip of the sensor. In this way, Raman spectra may be more accurate and consistent. Further, the cap may be permanently affixed or removably attached to the sensor. In some embodiments, a reflective surface may be included on the interior surface of the closed end of the cap. This reflective surface may reflect Raman scattering light toward the tip, enhancing the received signal by a factor of 2 to 100.