Laser Interferometer Lens Optics for Disturbance-Resistant Alignment
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Solution Overview
Problem
Existing laser interferometers face challenges in maintaining measurement accuracy and usability due to size increases and sensitivity to disturbances such as vibration and impact, requiring complex alignment and additional sensors that increase weight and complexity.
Innovation Solution
A laser interferometer design incorporating a light splitter, light modulator, light receiver, and first light collecting lens that adjusts the optical diameters of reference and object light paths to maintain alignment and interference, using compact and lightweight components to reduce size and enhance robustness against disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional alignment methods are used to form the superimposition region, then measurement accuracy can be maintained, but time and effort are required for positioning which reduces usability
Solution Approach 1:
The patent applies preliminary action by pre-configuring the optical system with a light collecting lens that automatically defines the superimposition region boundaries. The lens is positioned beforehand to receive reference light and object light within specific angular ranges, eliminating the need for time-consuming alignment operations during setup while ensuring measurement accuracy is maintained
2Measurement precision
If sensors are added to cancel disturbance effects, then measurement accuracy under disturbance can be maintained, but size and weight of the laser interferometer increase
Solution Approach 1:
The patent replaces the mechanical sensor-based disturbance cancellation system with an optical solution. By using a light collecting lens to define angular acceptance ranges and create a stable superimposition region, the system achieves disturbance resistance through optical geometry rather than mechanical sensing and feedback, thereby reducing weight while maintaining measurement accuracy
3Ease of operation
If the optical diameters of reference light and object light are not differentiated, then alignment is simpler, but measurement accuracy decreases under disturbance such as vibration and impact
Solution Approach 1:
The patent applies local quality by creating asymmetric optical paths where the reference light and object light have different optical diameters and angular acceptance ranges. The light collecting lens is configured with specific numerical aperture to accept reference light from a narrow angular range while accepting object light from a wider angular range, making each optical path optimized for its specific function and providing disturbance resistance
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 design ensures stable measurement accuracy and ease of alignment, reducing the interferometer's size and weight while maintaining high signal-to-noise ratios and resistance to disturbances.
Implementation Method 1
a light modulator configured to modulate a frequency of the first split light to generate reference light
Implementation Method 2
the object light beam and the reference light beam interfere with each other in a region where the two types of light are superimposed on each other (superimposition region), so that the vibration speed or any other factor of the object can be measured
Implementation Method 3
a first light collecting lens disposed in an optical path of the first split light or an optical path of the second split light and configured to collect incident light
Implementation Method 4
a laser light source configured to output laser light
Data Source
AI summary
A laser interferometer including: a laser light source configured to output laser light; a light splitter configured to split the laser light into first split light and second split light; a light modulator configured to modulate a frequency of the first split light to generate reference light; a light receiver configured to receive object light generated by the second split light reflected off by a target object, and the reference light; and a first light collecting lens disposed in an optical path of the first split light or an optical path of the second split light and configured to collect incident light, wherein the first light collecting lens is configured that an optical diameter of the incident light is smaller than an optical diameter of non-incident light at the light receiver.