Spectrometer Auto-Focus Controller for Removable Diffraction Gratings
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Solution Overview
Problem
Spectrometers face challenges in maintaining focus when switching between different light dispersing elements, requiring precise manual adjustments that are impractical due to the delicate optical setup and variability in diffraction gratings, leading to potential misalignment and loss of focus.
Innovation Solution
A spectrometer with a controller that automatically adjusts the focusing element's position relative to the analysis plane based on the presence and configuration of removable light dispersing elements, ensuring consistent focus without manual intervention, using a movable focusing element and a rotatable turret for diffraction gratings, and employing a polynomial equation for efficient data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustments are used to maintain focus when switching between different light dispersing elements, then focus precision can be maintained, but the operation becomes complex and time-consuming due to the delicate optical setup and variability in diffraction gratings
Solution Approach 1:
The spectrometer system automatically detects the diffraction grating configuration and adjusts the focusing element position without manual intervention. The controller reads grating identification data, retrieves corresponding focus position parameters, and actuates the focusing element automatically, making the system self-adjusting and eliminating complex manual operations.
Solution Approach 2:
The system incorporates a feedback mechanism where the controller reads identification information from the diffraction grating (via RFID tag, barcode, or other identification means), determines the appropriate focus position based on stored calibration data, and adjusts the focusing element accordingly. This closed-loop feedback ensures accurate focus maintenance across different gratings.
2Adaptability or versatility
If multiple diffraction gratings are used to analyze different wavelength ranges, then spectral analysis versatility is improved, but the device complexity increases due to the need for grating exchange mechanisms
Solution Approach 1:
The spectrometer is designed with a universal interface that can accommodate multiple different diffraction gratings. The system includes a grating holder with identification means (RFID tag, barcode reader, or camera) that universally identifies any grating in the set, and a controller that manages all gratings through a single automated focus adjustment mechanism, eliminating the need for separate adjustment mechanisms for each grating type.
Solution Approach 2:
The controller acts as an intermediary between the diffraction grating and the focusing element. It reads identification information from the grating, retrieves the appropriate focus position parameters from stored calibration data, and actuates the focusing element accordingly. This intermediary simplifies the interface between diverse gratings and the focusing mechanism.
3Stability of the object's composition
If the detector is fixed at the analysis plane, then structural stability is improved, but the ability to adjust focus when changing gratings is lost
Solution Approach 1:
While the detector remains fixed at the analysis plane for structural stability, the focusing element (mirror or lens) is made dynamically adjustable through an automated positioning mechanism. The controller actuates this mechanism to change the focus position based on the detected grating type, providing dynamic focus adjustment capability without moving the detector.
Solution Approach 2:
The system replaces manual mechanical adjustment of the detector position with an automated actuation mechanism that adjusts the focusing element position. This substitution maintains the detector's fixed, stable position while providing automated focus adjustment through motorized or piezoelectric actuation of the focusing element.
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
Enables the spectrometer to maintain focus automatically across different configurations and light sources, reducing the need for bulky flanges and manual adjustments, allowing for precise analysis over a wide wavelength range without compromising optical performance.
Implementation Method 1
The light diverges from the slit and is collimated and passed onto a disperser, which separates the light into its constituent wavelengths
Implementation Method 2
The light then passes to a focusing element, which is used to focus the light onto an imaging or analysing plane
Data Source
AI summary
The present invention provides a spectrometer, comprising: an inlet for the receipt of incident light; an optical path for transmitting the incident light from the inlet to an analysis plane; a focusing element located along the optical path, wherein the spectrometer has an in-focus position in which a focal point of the spectrometer and the analysis plane coincide; and a controller adapted in use, when a removable light disperser is placed along the optical path, to cause the spectrometer to be in the in-focus position by controlling the position of the focusing element relative to the analysis plane. The spectrometer is used in the analysis of light from a light source and, due to the ability of the controller to manage the focus point by way of moving the focusing element, the spectrometer is able to bring itself into an in-focus configuration without the need for a user to intervene.