A non-invasive, low frequency resonant method to detect bubbles in liquid media

Rivera, Manuel; López, Edwin; Cancelos, Silvina

doi:10.1016/j.apacoust.2021.108044

Cited by 6 publications

(1 citation statement)

References 31 publications

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“…In [ 3 ], authors developed an acoustic cylindrical chamber surrounded by a piezoelectric transducer that, simultaneously, generates low-frequency standing pressure waves and measure changes in the resonance frequency of the camber due to the presence of bubbles in the fluid. Yet interesting, this solution requires the dedicated design of a chamber with a high Q-factor.…”

Section: Introductionmentioning

confidence: 99%

Optical Multi-Parameter Measuring System for Fluid and Air Bubble Recognition

Bello

Bodo

Merlo

2023

Sensors

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Detection of air bubbles in fluidic channels plays a fundamental role in all that medical equipment where liquids flow inside patients’ blood vessels or bodies. In this work, we propose a multi-parameter sensing system for simultaneous recognition of the fluid, on the basis of its refractive index and of the air bubble transit. The selected optofluidic platform has been designed and studied to be integrated into automatic pumps for the administration of commercial liquid. The sensor includes a laser beam that crosses twice a plastic cuvette, provided with a back mirror, and a position-sensitive detector. The identification of fluids is carried out by measuring the displacement of the output beam on the detector active surface and the detection of single air bubbles can be performed with the same instrumental scheme, exploiting a specific signal analysis. When a bubble, traveling along the cuvette, crosses the readout light beam, radiation is strongly scattered and a characteristic fingerprint shape of the photo-detected signals versus time is clearly observed. Experimental testing proves that air bubbles can be successfully detected and counted. Their traveling speed can be estimated while simultaneously monitoring the refractive index of the fluid.

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Section: Introductionmentioning

confidence: 99%