Spectrometer Wave Gear Strain Elimination
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Solution Overview
Problem
Existing spectrometers face challenges in achieving high angular accuracy for wavelength selection due to strain accumulation in elastic gears of wave gear devices, limiting the precision of monochromatic light extraction.
Innovation Solution
A spectrometer design that employs a wave gear device with a control mechanism to rotate the input shaft by 180° or more, eliminating strain in the elastic gear and enhancing wavelength reproducibility by positioning the input shaft at a reference angular position before changing to the target wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a wave gear device is used as a reduction gear in the spectrometer, then a large reduction ratio can be obtained, but strain accumulates in the elastic gear and angular errors are created
Solution Approach 1:
The control mechanism rotates the input shaft by 180° or more before positioning at the target wavelength, performing a preliminary action to eliminate strain accumulation in the elastic gear. This preliminary rotation ensures the gear returns to an unstressed state, preventing angular errors before they affect measurement precision.
Solution Approach 2:
The system implements periodic strain elimination by rotating the input shaft 180° or more at regular intervals during wavelength scanning. This periodic action resets the elastic gear's strain state, maintaining angular accuracy throughout extended operation periods.
2Measurement precision
If the diffraction grating is rotated with very fine pitch and accuracy, then wavelength accuracy is improved, but the rotational driving mechanism becomes more complex
Solution Approach 1:
The wave gear device serves as an intermediary mechanism between the motor and diffraction grating. It provides the necessary reduction ratio and precision through its elastic deformation mechanism, simplifying the overall drive system while maintaining the fine angular control needed for high wavelength accuracy.
Solution Approach 2:
The control system dynamically adjusts the rotation angle of the input shaft (by 180° or more) to compensate for strain effects. This parameter change in the driving mechanism's operation maintains angular accuracy without requiring mechanical modifications to increase complexity.
3Speed
If the input shaft is positioned directly at the target wavelength, then operation speed is improved, but strain in the elastic gear causes angular errors
Solution Approach 1:
Before positioning the input shaft at the target wavelength, the system performs a preliminary rotation of 180° or more to eliminate strain. This two-step process (preliminary rotation + final positioning) maintains angular accuracy while minimizing additional time through efficient control sequencing.
Solution Approach 2:
The control mechanism rapidly executes the 180°+ rotation to eliminate strain, then quickly positions at the target wavelength. The brief preliminary action is performed at high speed, minimizing the time penalty while ensuring angular accuracy is maintained.
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 approach significantly reduces angular errors, enabling higher wavelength accuracy and reproducibility in monochromatic light extraction, surpassing previous spectrometer capabilities.
Implementation Method 1
the elastic gear 73 elastically deforms with the rotation of the wave generator 71
Implementation Method 2
light that is chromatically dispersed by the diffraction grating
Data Source
AI summary
A spectrometer has a motor, a reduction means for employing a wave gear device to reduce the rotation of the motor, a wavelength dispersion device for being driven by rotation that was reduced by the reduction means, and a control means for controlling the operation of the motor. When changing the wavelength of light that is extracted from the spectrometer, the control means controls the motor so that an input shaft of the wave gear device is rotated by 180° or more before the input shaft is positioned at an angular position that corresponds to the target wavelength.