Optical Grating Measuring Device Simplifies Light Path
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Solution Overview
Problem
Existing optical grating sensing technologies face issues with complex optical structures, asymmetric light intensity, severe DC drifting, and signal distortion due to the use of polarization to control light paths and generate interference signals, particularly when using Gauss light beams and optical lenses.
Innovation Solution
A measuring device comprising a light source, a first beam splitter, an optical grating, and a reflector, where the light beam is divided into two paths, diffracted by the grating, and the resulting diffraction light beams interfere at the sensor with included angles greater than 0 degrees and less than 180 degrees, allowing for improved signal reception and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarization is used to control light paths and generate interference signals, then the sensing function is achieved, but the optical structure becomes complicated
Solution Approach 1:
The patent extracts and eliminates the polarization control components from the optical system. Instead of using polarization to control light paths and generate interference signals, the invention uses a simplified optical grating structure that directly generates interference patterns through diffraction, removing the need for complex polarization control mechanisms while maintaining the sensing function
Solution Approach 2:
The patent replaces the polarization-based optical control mechanism with a diffraction-based interference generation mechanism. The optical grating structure directly converts incident light into interference patterns through its periodic structure, substituting the mechanical/polarization control system with a passive diffraction-based system that achieves the same sensing objective with reduced complexity
2Reliability
If Gauss light beam is split into two parts using optical lenses, then interference signals are generated, but asymmetric light intensity and severe DC drifting occur
Solution Approach 1:
The patent removes the optical lenses from the light splitting mechanism. Instead of using lenses to split the Gauss light beam into two parts, the invention uses the optical grating itself to generate the interference pattern through diffraction of the entire beam, eliminating the source of asymmetric light intensity and DC drifting that arises from lens-based splitting
Solution Approach 2:
The patent introduces the optical grating as an intermediary element that directly interacts with the incident light beam to generate interference patterns. The grating structure serves as the mediating component that converts the incident light into measurable interference signals without requiring additional light splitting components, thereby maintaining light intensity symmetry and reducing DC drifting
3Quantity of substance
If 0 order light is mixed with ±1 orders, then all diffraction orders are captured, but signal distortion occurs
Solution Approach 1:
The patent applies segmentation by spatially separating different diffraction orders using a lens and position-sensitive detector arrangement. The system captures multiple diffraction orders (including 0 order and ±1 orders) but uses optical focusing to spatially resolve them on the detector, allowing selective measurement of specific orders while maintaining the ability to capture the complete diffraction pattern for comprehensive signal information
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
This configuration simplifies the optical structure, reduces signal distortion, and enhances the signal-noise ratio by ensuring proper alignment and overlap of diffraction light beams, leading to more accurate interference signal measurement.
Implementation Method 1
a first beam splitter 122 is disposed on a light path of the light beam, where the light beam is divided into a first light beam and a second light beam by the first beam splitter
Implementation Method 2
The first light beam and the second light beam are diffracted by the optical grating to generate multiple first diffraction light beams at different angles and multiple second diffraction light beams at different angles respectively
Implementation Method 3
the first beam splitter enables the second light beam to be delivered to the reflector, and then the second light beam is reflected to the optical grating by the reflector
Implementation Method 4
The first diffraction light beams and the second diffraction light beams are received by the sensor after interference
Data Source
AI summary
A measuring device including a light source emitting a light beam, a first beam splitter disposed on a light path of the light beam, an optical grating, a reflector, and a sensor is provided. The light beam is divided into first and second light beams by the first beam splitter. The optical grating is disposed on light paths of the first and second light beams. The first beam splitter enables the first light beam to be delivered to the optical grating. The reflector is disposed on the light path of the second light beam. The first beam splitter enables the second light beam to be delivered to the reflector and reflected to the optical grating. The first and second light beams are diffracted by the optical grating to generate multiple first and second diffraction light beams at different angles respectively, which are received by the sensor after interference.