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Sub-micrometer resolution liquid level sensor based on a hollow core fiber structure.

Dejun Liu, Fengzi Ling, Rahul Kumar

|April 16, 2019

Summary

This summary is machine-generated.

We developed a highly sensitive liquid level sensor using a hollow core fiber (HCF) structure for lab on a chip (LOC) devices. This compact fiber optic sensor achieves unprecedented resolution for precise microfluidic measurements.

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Area of Science:

Optics and Photonics
Microfluidics
Sensor Technology

Background:

Accurate liquid level measurement is crucial for lab on a chip (LOC) devices.
Existing sensors often lack the required ultra-high resolution and miniature size for LOC applications.
Fiber optic sensors offer potential for miniaturization and high sensitivity.

Purpose of the Study:

To develop a simple, compact, and highly sensitive liquid level sensor for LOC devices.
To investigate the performance of a hollow core fiber (HCF) based sensor.
To achieve a liquid level resolution significantly better than existing fiber optic sensors.

Main Methods:

Fabrication of a liquid level sensor by fusion splicing a short section of hollow core fiber (HCF) between two singlemode fibers (SMFs).
Systematic study of sensor performance with varying HCF lengths.
Characterization of sensor sensitivity, resolution, repeatability, and cross-sensitivity.

Main Results:

A sensor with a HCF length of approximately 4.73 mm demonstrated the highest sensitivity of about 0.014 dB/μm.
Achieved a liquid level resolution of approximately 0.7 μm, over five times higher than previous fiber optic sensors.
The sensor exhibited good measurement repeatability and low cross-sensitivity to surrounding medium refractive index changes.

Conclusions:

The proposed HCF-based fiber optic sensor is a promising solution for ultra-high resolution liquid level measurement in LOC devices.
The sensor's compact size, high sensitivity, and good repeatability make it suitable for microfluidic applications.
This technology offers a significant advancement in sensing capabilities for miniaturized analytical systems.