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Self-mixing laser Doppler flow sensor: an optofluidic implementation.

Milan Nikolić, Elaine Hicks, Yah Leng Lim

|February 12, 2014

Summary

This summary is machine-generated.

We developed a miniaturized self-mixing interferometry (SMI) optofluidic sensor for lab-on-a-chip systems. This device accurately measures fluid velocity and particle size, offering a low-cost, single-path optical solution.

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Area of Science:

Optofluidics
Microfluidics
Optical sensing

Background:

Miniaturization of optical systems is crucial for lab-on-a-chip applications.
Self-mixing interferometry (SMI) offers a compact sensing approach with a single optical path.
Integrating SMI into microfluidic devices presents opportunities for advanced fluid analysis.

Purpose of the Study:

To miniaturize self-mixing interferometry (SMI) into a microfluidic circuit using optical fiber.
To characterize the performance of the optofluidic device as a fluid velocity and flow sensor.
To demonstrate the potential for measuring other parameters like particle size within the same system.

Main Methods:

Fabrication of an optofluidic device by integrating SMI into a microfluidic circuit with an optical fiber.
Characterization of fluid velocity sensing performance across a range of velocities (0.5–60 mm/s).
Evaluation of sensor performance across nearly four decades of scatterer concentration.

Main Results:

The optofluidic SMI device demonstrated accurate fluid velocity measurements, correlating well with theoretical predictions.
The sensor operated effectively over a wide range of fluid velocities and scatterer concentrations.
The system requires only a single optical path for both laser transmission and light reception.

Conclusions:

Miniaturized SMI in an optofluidic system provides a versatile and accurate sensing component for lab-on-a-chip devices.
The self-aligned nature and divergent light output facilitate low-cost manufacturing and easy optical alignment.
This integrated approach enables simultaneous measurement of fluid velocity and particle characteristics.