Micro-cantilever Sensor for Sedimentation Monitoring
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Solution Overview
Problem
Existing methods for measuring sedimentation or diffusion rates in fluid media are limited by high time requirements, complex sample preparation, equipment size, cost, and lack of portability, making them unsuitable for rapid and accurate measurements in medical diagnostics and industrial applications.
Innovation Solution
A self-sensing micro-cantilever fluid probe sensor with integrated heater and piezo-resistive sensors, utilizing materials with different coefficients of thermal expansion, allows for real-time monitoring of sedimentation parameters by pulsing heat and sampling responses, enabling simultaneous measurement of sedimentation and diffusion rates with high sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical techniques are used to measure sedimentation rate, then measurement can be performed in transparent bulk fluid medium, but the equipment size is large and portability is poor
Solution Approach 1:
The patent replaces traditional optical measurement systems with a micro-mechanical cantilever sensor system. The cantilever sensor directly mechanically interacts with the fluid medium and suspended particles, detecting sedimentation through mechanical displacement rather than optical properties. This substitution enables miniaturization while maintaining measurement capability.
Solution Approach 2:
The invention extracts the essential measurement function from complex optical equipment and concentrates it into a single micro-cantilever sensor element. By taking out only the core sensing capability and implementing it at the micro-scale, the system achieves portability without sacrificing measurement precision.
2Measurement precision
If traditional sedimentation measurement methods are used, then sample separation can be measured, but time to answer is long and sample preparation is complex
Solution Approach 1:
The micro-cantilever sensor is pre-positioned within the fluid medium sample chamber, eliminating the need for complex sample preparation and positioning steps. The sensor is already in place to detect sedimentation as it occurs, enabling rapid measurement without preliminary setup time.
Solution Approach 2:
The cantilever sensor continuously monitors the fluid medium in real-time as sedimentation occurs, rather than requiring discrete sampling intervals. This continuous detection enables immediate measurement of sedimentation rate without waiting for predetermined time periods.
3Measurement precision
If integrated heater and piezo-resistive sensor are used in micro-cantilever, then sensitivity and accuracy are improved, but device complexity increases
Solution Approach 1:
The patent combines the heater element and piezo-resistive sensor into the single micro-cantilever structure. Both functional elements are integrated during fabrication, sharing the same substrate and interconnection layers. This merging reduces the number of discrete components and simplifies the overall device architecture while maintaining enhanced measurement capabilities.
Solution Approach 2:
The micro-cantilever structure serves multiple functions simultaneously: it acts as the sensing element for detecting sedimentation, contains the heater for thermal actuation, and incorporates the piezo-resistive sensor for signal detection. This multi-functionality eliminates the need for separate components, reducing device 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 micro-cantilever sensor provides rapid, accurate, and portable measurements of sedimentation and diffusion rates, reducing sample preparation time and equipment size while improving sensitivity and accuracy, making it suitable for medical diagnostics and industrial applications.
Implementation Method 1
pulsing the heater with one or more electrical pulses to induce heat generation in the micro-cantilever
Implementation Method 2
having a heater and piezo-resistive sensor integrated therein, sampling the output of the integrated piezo-resistive sensor to characterise a response of the micro-cantilever
Implementation Method 3
micro-cantilever sensor comprising at least two materials having different coefficients of thermal expansion
Implementation Method 4
micro-cantilever sensor comprising at least two materials having different coefficients of thermal expansion
Implementation Method 5
Measurement of the sedimentation (or ability of suspended particles to settle within a liquid, under the influence of gravity)
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
There is provided a method of measuring a sedimentation parameter of suspensions or precipitants in a fluid medium sample, said method compromising providing at least one micro-cantilever sensor, said micro-cantilever sensor comprising at least two materials having different coefficients of thermal expansion, and having a heater and piezo-resistive sensor integrated therein, pulsing the heater with one or more electrical pulses to induce heat generation in the micro-cantilever, sampling the output of the integrated piezo-resistive sensor to characterise a response of the micro-cantilever during sedimentation in the fluid medium sample, and determining a value of the sedimentation parameter from the characterised response. There is also provided an apparatus arranged to carry out the method.