Multi-Axis Displacement Sensor Using Perpendicular Cantilever Beams
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current displacement sensors using arched members are unable to accurately measure movements in multiple axes at a single location due to twisting or distortion, leading to ambiguous measurements, and are limited in measuring displacements not parallel to the attachment points, making them inadequate for real-world structural monitoring.
Innovation Solution
A displacement sensor assembly comprising cantilever beams with strain and temperature sensors, oriented perpendicular to the displacement axis, allowing for decoupling and differentiation of movements in multiple axes, and capable of measuring displacements in one, two, or three orthogonal axes by vector summation of strain values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple arched members are arranged orthogonally to measure movements in multiple axes, then the ability to discriminate between movements in different axes is improved, but twisting or distortion of the arched members still occurs causing measurement errors
Solution Approach 1:
The measurement system is segmented into multiple independent cantilever beams, each dedicated to measuring displacement in a specific axis. Each beam is independently mounted and oriented perpendicular to its measurement axis, preventing interference and distortion between measurements. This segmentation allows accurate multi-axis measurement without the twisting problems that occur with arched members.
Solution Approach 2:
The cantilever beams are oriented perpendicular to the displacement axis being measured, representing a dimensional change from the parallel orientation of arched members. This perpendicular orientation allows the beams to flex independently in response to displacement along their respective axes without experiencing twisting or distortion, thereby maintaining measurement precision across multiple axes.
2Device complexity
If arched members are used to measure displacement, then the device structure is simple, but the sensor cannot accurately measure movements not parallel to the attachment points
Solution Approach 1:
The sensor assembly is segmented into multiple cantilever beams, each oriented perpendicular to a specific measurement axis. This segmentation enables the system to measure displacements in multiple directions (X, Y, and Z axes) independently, greatly enhancing adaptability while maintaining relatively simple individual beam structures.
Solution Approach 2:
By orienting the cantilever beams perpendicular to the displacement axes rather than parallel, the system gains the ability to accurately measure movements in any direction. Each beam's perpendicular orientation to its measurement axis allows it to respond purely to displacement along that axis without distortion, providing versatile multi-directional measurement capability.
3Ease of operation
If strain sensors are attached to arched members for displacement measurement, then the measurement system is straightforward, but movements in axes not parallel to attachment points cause twisting leading to erroneous measurements
Solution Approach 1:
The measurement system is divided into multiple independent cantilever beams, each with its own strain sensor attached. Each beam-sensor pair is dedicated to measuring displacement in a specific axis, eliminating the twisting and distortion problems that occur when strain sensors are attached to arched members subjected to multi-axis movements. This segmentation maintains ease of operation while dramatically improving measurement precision.
Solution Approach 2:
The cantilever beams are oriented perpendicular to the displacement axes, representing a dimensional change from the parallel orientation of arched members. This perpendicular orientation ensures that each beam flexes independently in response to displacement along its measurement axis without experiencing twisting, allowing strain sensors to accurately measure displacement in multiple directions without measurement errors.
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 accurate and unambiguous measurement of displacements in multiple axes, improving structural health monitoring and safety by providing precise data on structural integrity and load limits, and can be configured to fit complex structural configurations.
Implementation Method 1
a strain sensor mounted and calibrated to detect displacement between the fixed and moving reference by measuring strain on the second end of the cantilever beam
Implementation Method 2
a temperature sensor mounted and calibrated to counteract the effect of thermal strain on the sensor assembly
Data Source
AI summary
Provided is a displacement sensor assembly which includes a cantilever beam, a reaction block, a strain sensor, and a temperature sensor. The cantilever beam is physically oriented such that the longitudinal axis of the cantilever beam is perpendicular to the direction of displacement. A first end of the cantilever beam is fixably mounted to a fixed reference and a first end of the reaction block is fixably mounted to a moving reference. A second end of the cantilever beam is joined to a second end of the reaction block. The strain sensor is mounted and calibrated to detect displacement between the fixed and moving reference by measuring strain on the second end of the cantilever beam, and the temperature sensor is mounted and calibrated to counteract the effect of thermal strain on the sensor assembly and a method of use therefore.