Optomechanically Compensated Spectrometer Thermal Expansion
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Solution Overview
Problem
Spectrometers face defocusing issues due to thermal expansion of optical base bodies, leading to reduced spectral resolution, and existing solutions like thermostatic stabilization or using materials with low thermal expansion coefficients are either energy-intensive or limit design and manufacturing options, while mechanically moving the entrance slit compromises light input stability.
Innovation Solution
A spectrometer design with a mirror group, including at least two moveable mirrors coupled with a temperature-controlled drive, allows for virtual displacement of the light entry aperture to compensate for thermal expansion, maintaining focal curve alignment without physically moving the entrance slit, using thermobimetal for energy-efficient and stable temperature compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermostatic stabilization is used to maintain spectral resolution, then spectral resolution is improved, but energy consumption increases
Solution Approach 1:
The spectrometer uses its own thermal expansion to automatically compensate for focal curve shifts. The base body's expansion directly moves the dispersion grating and detectors in a coordinated manner, eliminating the need for external thermostatic control systems and reducing energy consumption while maintaining spectral resolution
Solution Approach 2:
The invention changes the physical state of the base body by utilizing its thermal expansion properties. Instead of preventing temperature changes, the system allows temperature variations and uses the resulting dimensional changes to maintain optical alignment, converting a harmful effect into a useful compensation mechanism
2Measurement precision
If materials with low thermal expansion coefficients are used for the optical base body, then spectral resolution is improved, but design and manufacturing options are limited
Solution Approach 1:
The invention deliberately utilizes thermal expansion of conventional aluminum alloy materials to achieve compensation. By designing the base body with specific geometric features and mounting arrangements, the natural expansion of common materials is converted into a mechanism that maintains focal curve alignment, eliminating the need for specialized low-expansion materials
Solution Approach 2:
The base body incorporates multiple functional zones with different thermal expansion characteristics. By combining conventional materials in a composite structure with strategically designed expansion zones, the system achieves compensation effects while maintaining manufacturing ease and design flexibility
3Measurement precision
If the entrance slit is mechanically moved to compensate thermal effects, then spectral resolution is improved, but light input stability deteriorates
Solution Approach 1:
The compensation mechanism is segmented into separate functional components: the base body provides structural support and controlled expansion, while the dispersion grating and detectors are mounted to move relative to the base body. This segmentation allows the entrance slit to remain fixed for stable light input while other components move to maintain focal alignment
Solution Approach 2:
The base body acts as an intermediary between the fixed entrance slit and the movable dispersion elements. Its controlled thermal expansion serves as a mediator that coordinates the relative positions of components, maintaining optical alignment without requiring movement of the entrance slit itself
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 effectively maintains spectral resolution by adjusting the optical path length and focal distances without altering the entrance slit's position relative to the emission source, ensuring stable light input and reducing energy consumption, particularly beneficial for mobile devices.
Implementation Method 1
Temperature changes caused by the thermal expansion coefficients of the materials used have a direct effect on the properties of the spectrometer
Implementation Method 2
using thermobimetal for energy-efficient and stable temperature compensation
Implementation Method 3
A spectrometer design with a mirror group, including at least two moveable mirrors coupled with a temperature-controlled drive, allows for virtual displacement of the light entry aperture
Data Source
AI summary
A spectrometer for examining the spectrum of an optical emission source may include: an optical base body, a light entry aperture connected to the optical base body to couple light into the spectrometer, at least one dispersion element to receive the light as a beam of rays and generate a spectrum, and at least one detector for measuring the generated spectrum. A light path may run from the light entry aperture to the detector. A mirror group with at least two mirrors may be provided in a section of the light path between the light entry aperture and the at least one detector, in which the beam does not run parallel, which may compensate for temperature effects. In the mirror group, at least one mirror or the entire mirror group may be moveable relative to the optical base body and may be coupled to a temperature-controlled drive.