Optical Telemetry for Electro-Mechanical Switch Position Verification
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Solution Overview
Problem
Conventional electromechanical switch telemetry systems based on electromechanical sensor switches, such as reed switches, often fail to provide accurate position indication due to failures caused by foreign object debris on contact surfaces, especially in remote and inaccessible RF switch applications like spacecraft communications.
Innovation Solution
An optical telemetry system is introduced, which includes a switching member with a motor, a target disk with a light reflective portion, and light transmitters and detectors to accurately monitor the position of the electromechanical switch by transmitting and receiving light, allowing for precise verification of the switch position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromechanical sensor switches (reed switches) are used to monitor switch position, then the telemetry system can detect the position of the electromechanical switch, but the system reliability deteriorates due to sensor switch failures caused by foreign object debris on contact surfaces
Solution Approach 1:
The patent replaces electromechanical reed switches with optical sensors (photodetectors) and light sources to detect switch position. This substitution eliminates mechanical contact surfaces that accumulate foreign object debris, thereby resolving the reliability issue while maintaining position detection accuracy. The optical sensing system has no moving parts or contact surfaces that wear or contaminate.
Solution Approach 2:
The patent introduces an optical intermediary system consisting of light sources, reflective surfaces on the rotary switch, and photodetectors. This intermediary optical field mediates the position detection process without requiring direct mechanical contact between sensor and switch components, thereby eliminating the foreign object debris problem while preserving measurement capability.
2Loss of information
If multiple reed switches are used to monitor all poles of the electromechanical switch, then complete position information is obtained, but the device complexity increases due to the number of electromechanical components
Solution Approach 1:
The patent replaces multiple electromechanical reed switches with an optical sensing system that uses light sources and photodetectors arranged to monitor multiple switch positions. This substitution reduces mechanical complexity while maintaining the ability to detect the position of all switch poles, as optical components have fewer moving parts and simpler construction.
Solution Approach 2:
The optical sensing system serves multiple functions: it can detect the position of multiple switch poles simultaneously using a unified optical detection mechanism, whereas traditional systems required separate reed switches for each pole. The optical system provides a universal detection approach that simplifies the overall device architecture.
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 optical telemetry system provides reliable and accurate monitoring of the electromechanical switch position, reducing errors associated with electromechanical sensor failures and ensuring consistent operation in remote RF switch applications.
Implementation Method 1
at least one of the plurality of light detectors is configured to receive light reflected from the light reflective portion of the target disk for a given switch position
Data Source
AI summary
A system or method of verifying a new contact position of a multi-pole electro-mechanical switch having a plurality of contact positions is disclosed. The switch is caused to move to a new contact position. Power is provided to at least one light transmitter to cause the at least one light transmitter to transmit light toward a light reflective portion. A particular light detector among a plurality of light detectors that has received light from the light reflective portion is identified. The new contact position is verified based on the identification.