Ruggedized Interferometer Servo Control for Vibration Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Michelson interferometers face challenges in producing uninterrupted and high-quality data in environments with externally applied forces such as vibrations, tilts, and accelerations, which are common in portable and industrial applications, leading to data aberrations and system upsets.
Innovation Solution
A ruggedized interferometer design incorporating a light source, fixed and moving mirrors, a beam splitter, and a servo control system that applies a substantial force during turnaround using open loop control, combined with a dynamic alignment system featuring piezo or mechanical actuators and shock-absorbing structures to mitigate external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a Michelson interferometer is used in portable or industrial applications, then the instrument can be deployed in real-world environments, but it becomes susceptible to externally applied forces such as vibrations, tilts, and accelerations that cause data aberrations and system upsets
Solution Approach 1:
The patent applies counterbalancing forces through the servo motor to compensate for externally applied forces. The servo motor generates opposing torques that counteract vibrations, tilts, and accelerations, maintaining the moving mirror's position stability despite external disturbances in portable environments
Solution Approach 2:
The patent implements a feedback control system using encoders to continuously monitor the moving mirror's position and the servo motor's state. This feedback loop enables real-time adjustments to counteract external forces, ensuring data quality consistency across different deployment environments
2Object-affected harmful factors
If the moving mirror is made more massive to resist external forces, then resistance to vibrations and tilts improves, but the inertia increases making it harder to accelerate and decelerate the mirror
Solution Approach 1:
The patent replaces pure mechanical inertia-based resistance with an active servo motor control system. The servo motor provides electronic damping and force compensation, achieving external force resistance without relying on increased mirror mass, thereby maintaining fast acceleration and deceleration capabilities
Solution Approach 2:
The patent dynamically adjusts the servo motor's control parameters (gain, damping, force application timing) based on the operating phase (scan vs. turnaround). This allows optimal performance across different conditions without requiring a heavily massed mirror, maintaining both resistance to external forces and speed performance
3Reliability
If the servo motor applies force continuously to maintain position, then resistance to external forces improves, but energy consumption increases
Solution Approach 1:
The patent applies servo motor force periodically and selectively - primarily during turnaround phases when external forces are most problematic and position stability is most challenging to maintain. During steady-state scanning, the servo force is reduced or discontinued, minimizing energy consumption while maintaining position stability when most needed
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 consistent, high-quality data output even in environments with significant vibrations and tilts, allowing for continuous operation without data dropouts, similar to laboratory conditions, with improved resistance to external forces.
Implementation Method 1
a beam splitter that directs a first portion of the beam of light to the fixed mirror and a second portion of the beam of light to the moving mirror, where the beam splitter recombines the first portion reflected from the fixed mirror and the second portion reflected from the moving mirror
Implementation Method 2
a dynamic alignment system featuring piezo or mechanical actuators
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An embodiment of a ruggedized interferometer is described that comprises a light source (210) that generates a beam of light; a fixed mirror (207); a moving mirror (205) that travels along a linear path; a beam splitter (215) that directs a first portion of the beam of light to the fixed mirror and a second portion of the beam of light to the moving mirror, wherein the beam splitter recombines the first portion reflected from the fixed mirror and the second portion reflected from the moving mirror; and a servo control (203) that applies a substantial degree of force to the moving mirror at initiation of a turnaround period, wherein the substantial degree of force is sufficient to redirect the moving mirror traveling at a high velocity to an opposite direction of travel on the linear path.