Flow Measurement and Calibration Techniques for Microfluidic Systems
Summary
Flow measurement and calibration in microfluidic systems have advanced rapidly to address the challenges of handling minute fluid volumes with high precision and reliability. Techniques now span gravimetric approaches, optical methods such as interface tracking and interferometry, micro Particle Image Velocimetry (μPIV) and sensor-based strategies that exploit pressure, thermal or electrokinetic principles. Central to these developments is the establishment of traceable procedures and rigorous uncertainty evaluation, enabling confidence in applications ranging from drug delivery and organ-on-a-chip platforms to chemical synthesis and point-of-care diagnostics. Emerging calibration protocols integrate automated control of environmental conditions and advanced imaging, reducing both systematic error and calibration time. Together, these innovations support the global push towards standardised metrology in microfluidics, ensuring interoperability of devices and adherence to regulatory requirements.
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Flow Measurement and Calibration Techniques for Microfluidic Systems publication trend
The graph below shows the total number of articles in flow measurement and calibration techniques for microfluidic systems across all publications each year (not limited to Nature Index journals).
Technical terms
Microfluidic system: A network of channels and chambers with dimensions typically below 1 mm, designed to manipulate minute fluid volumes for analysis or synthesis.
Gravimetric method: A flow measurement technique that determines volume or flow rate by tracking mass change over time using precision balances.
Optical interface tracking: A visual approach that monitors the displacement of a fluid front within a capillary or channel via high-speed imaging.
Micro Particle Image Velocimetry (μPIV): An optical technique for mapping fluid velocity fields by tracking tracer particles illuminated and recorded in rapid succession.
Traceability: The property of a measurement result whereby it can be related to national or international standards through an unbroken chain of comparisons, each with stated uncertainties.
References
- Ultra-low flow rate measurement techniques. Measurement Sensors (2021).
- Calibration methods for flow rates down to 5 nL/min and validation methodology. Biomedical Engineering / Biomedizinische Technik (2022).
- Rapid Calibration of Nanoliter per Second Flow Rate by Image Processing Technology. Micromachines (2023).
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