FTIR Interferometer Velocity Control via Flexure-Mounted Beamsplitter
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Solution Overview
Problem
Conventional dynamic velocity control systems in Fourier-Transform infrared (FTIR) interferometers suffer from delayed response times and increased velocity errors due to the use of rolling and sliding bearings, which introduce noise and require longer control times for the mobile mirror, leading to inaccuracies in spectral data.
Innovation Solution
A novel dynamic velocity control system is introduced, featuring a moving beamsplitter and mirror design with a low-mass, flexure-mounted beamsplitter that uses magnetic movement means and a control system to provide precise linear and tilt control, reducing response time and velocity errors by allowing smaller corrections and leveraging optical velocity multiplication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rolling and sliding bearings are used to move the mobile mirror, then the mirror can be positioned along the optic axis, but velocity error noise is introduced and response time is increased
Solution Approach 1:
The patent replaces the conventional mechanical bearing system (rolling and sliding bearings) with a flexure bearing system. The flexure bearing uses elastic deformation of a flexure element to support and guide the mobile mirror, eliminating mechanical contact and friction that cause velocity error noise and delay the response time. This substitution of mechanical support mechanisms directly addresses the contradiction by removing the source of noise and delay while maintaining the mirror's ability to move along the optic axis.
Solution Approach 2:
The patent changes the physical state and properties of the bearing system by transitioning from rigid mechanical contacts to elastic flexure elements. The flexure bearing utilizes elastic deformation parameters to provide smooth, frictionless support, fundamentally altering how the mirror is supported and moved. This parameter change eliminates the velocity error noise associated with mechanical contacts and reduces response time by eliminating friction-induced delays.
2Device complexity
If only one optical element is made mobile, then the interferometer structure is simplified, but control errors increase and spectral data accuracy deteriorates
Solution Approach 1:
The patent applies dynamics by making both the mobile mirror and the beamsplitter movable elements in the interferometer. This dynamic configuration allows both components to be independently controlled and corrected, enabling faster response times and reduced control errors. The mobile beamsplitter can be rapidly adjusted to compensate for errors, while the mobile mirror maintains its traditional function, creating a synergistic system that improves spectral data accuracy without significantly increasing structural complexity.
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 system achieves faster response times, lower velocity errors, and more accurate spectral resolution with a compact, lightweight, and cost-efficient configuration, maintaining the performance of conventional interferometers while reducing noise and improving data quality.
Implementation Method 1
magnetic movement means and a control system to provide precise linear and tilt control
Implementation Method 2
An optical interferometer used in ascientific analytical instrument relies on the interference of superimposed optical beams as part of the interrogation means
Implementation Method 3
the split beams are reflected from the conventionally fixed mirror and the conventionally mobile mirror and recombined at the beamsplitter
Data Source
AI summary
A novel means of provided velocity control of an interferometer wherein one of the moving components includes the beamsplitter element is introduced herein. Using a moving beamsplitter and coupled flexure mounting allows improved velocity control because the low mass of the beamsplitter enables the systems disclosed herein to respond faster than conventional mirror velocity controlled interferometer instruments with a resultant lower velocity error so as to provide a more stable and lower noise spectra from the analytical instrument. The control of the velocity of the beamsplitter and if desired, one or both of the configured mirrors, reduces the time wasted changing velocity at the ends of each scan. The result is an increase in data collection available in any given experiment time frame. Such desirable arrangements of the present invention thus allow scans to be collected at higher rates, which beneficially increase the ability to monitor rapidly changing systems.