Fiber-Based Cantilever Sensing Device for Fluidic Medium
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Solution Overview
Problem
MEMS cantilevers require light to travel through the fluid medium for signal transmission, leading to noise issues and the need for active alignment, which complicates the measurement of fluid physical properties.
Innovation Solution
A sensing device using fiber-based cantilevers embedded in a cartridge, where light is carried inside the optical fiber to improve signal-to-noise ratio and simplify optical readout alignment, eliminating the need for active alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MEMS cantilevers are used for sensing fluid physical properties, then measurement capability is provided, but noise is generated during signal transmission and active alignment is required
Solution Approach 1:
The patent introduces an optical fiber as an intermediary medium to transmit light signals to and from the cantilever. Instead of light traveling through the fluid medium directly to the cantilever surface (which causes noise), the optical fiber acts as a mediator that carries the light signal through the cartridge structure, eliminating the harmful noise factor while maintaining sensing capability
Solution Approach 2:
The patent replaces the mechanical alignment system with an optical fiber-based readout system. The optical fiber is pre-positioned within the cartridge structure, eliminating the need for active alignment mechanisms. The fiber optic readout system substitutes for complex mechanical alignment adjustments, simplifying the overall system while maintaining measurement precision
2Loss of information
If light travels through fluid medium to reach cantilever surface, then signal transmission is enabled, but noise is generated during transmission
Solution Approach 1:
The optical fiber serves as an intermediary that transmits light signals without requiring the light to travel through the fluid medium. The fiber is positioned within the cartridge structure, allowing signal transmission while eliminating the noise generation that occurs when light propagates through the fluid medium to reach the cantilever surface
3Measurement precision
If optical readout is used for MEMS cantilevers, then sensing is enabled, but active alignment is required
Solution Approach 1:
The optical fiber acts as a pre-positioned intermediary within the cartridge structure that eliminates the need for active alignment. The fiber is integrated into the cartridge design, serving as a fixed mediator between the light source and the cantilever, thereby removing the complexity of active alignment requirements while maintaining optical readout capability
Solution Approach 2:
The optical fiber is pre-positioned and pre-aligned within the cartridge structure during manufacturing. This preliminary action of positioning the fiber before the device is assembled eliminates the need for active alignment during operation. The fiber is already in its correct position to receive and transmit optical signals to and from the cantilever without requiring subsequent alignment adjustments
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 device achieves precise sensing of fluid physical properties with reduced noise and simplified alignment, enhancing measurement accuracy and efficiency.
Implementation Method 1
light is carried inside the optical fiber
Implementation Method 2
an electromagnet for generating a time-varying magnetic field
Implementation Method 3
a detector
Data Source
AI summary
A sensing device for measuring physical properties of fluid medium uses fiber based cantilevers embedded in a cartridge. The cartridge may include: at least one fluidic channel, at least one light channel, at least one chamber located at the intersection of the fluidic channel and the light channel, and at least one light guide placed in the light channel. The light guide is at least partially contained in the respective chamber. The light guide has a movable section. The vibration of the movable section may be externally actuatable.