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Fiber-optic liquid level sensor based on coupling optical path length variation.

Pabitra Nath¹, Hidam Kumarjit Singh, Dhananjay Tiwari

¹Department of Physics, Tezpur University Napaam, Dist. Sonitpur 784028, Assam, India. pnath@tezu.ernet.in

The Review of Scientific Instruments

|June 7, 2012

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A novel fiber-optic liquid level sensor uses light intensity modulation to detect changes. This simple sensor can measure liquid level variations with millimeter precision over a 25 cm range.

Area of Science:

Optoelectronics
Sensor Technology
Physics

Background:

Accurate liquid level monitoring is crucial in various industrial and scientific applications.
Existing sensors may face limitations in cost, complexity, or precision.

Purpose of the Study:

To introduce a new, simple fiber-optic sensor for liquid level measurement.
To demonstrate the feasibility and performance of the proposed sensing principle.

Main Methods:

The sensor utilizes two optical fibers where the coupling optical path distance varies with liquid level.
Light intensity modulation is employed as the sensing mechanism.
Experimental validation was performed to assess the sensor's capabilities.

Main Results:

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The fiber-optic sensor demonstrated a near-continuous monitoring capability for liquid level variations.
A high resolution of 1 mm was achieved within a 25 cm measurement scale.
The sensing principle based on light intensity modulation was experimentally verified.

Conclusions:

The proposed fiber-optic liquid level sensor offers a simple and effective solution.
The sensor exhibits high resolution and continuous monitoring, suitable for various applications.
This technology presents a promising alternative for liquid level sensing.