Real-time optical monitoring system for dye colour and concentration

Ueda, Masahiro; Mizuno, Sanae; Matsumura, Akio; Sakan, Fijio

doi:10.1016/0143-8166(95)00082-8

Cited by 4 publications

(1 citation statement)

References 1 publication

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“…and uses the solvent in which the dye is dissolved in order to tune the concentration of dye. Also, it is reported that the concentration of the colorant in the dye-solvent mixture decreases with time 1 . Due to such a problem, tracking the dye concentration becomes vital and there exists few literature that addresses such problems 2 .…”

Section: Introductionmentioning

confidence: 99%

A PMUT based photoacoustic system as a microfluidic concentration detector

Roy

Shastri

Kumar

et al. 2022

Photons Plus Ultrasound: Imaging and Sensing 2022

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We report on the development of a novel piezo-MEMS based optofluidic platform to detect the concentration of various species dissolved in a fluid. This platform employs piezoelectric micromachined ultrasound transducers (PMUTs) to work as a photoacoustic receiver, receiving ultrasound from fluid targets present in microfluidic channels while illuminated with a nanosecond pulsed laser. We fabricate both the PMUTs and the microfluidic channels and subsequently use them for the experiment. We also show the capability of PMUTs as a general photoacoustic receiver and demonstrate its signal-to-noise characteristics (~31) and its wide fractional bandwidth (~73%).

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Section: Introductionmentioning

confidence: 99%

A PMUT based photoacoustic system as a microfluidic concentration detector

Roy

Shastri

Kumar

et al. 2022

Photons Plus Ultrasound: Imaging and Sensing 2022

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Active light noise filter by a differential operation

Kawazu¹,

Chen²,

Suga

et al. 1997

Optics and Lasers in Engineering

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A method for an active light noise filter is proposed by using two identical light receivers. They work as a differential electrometer by a common mode connection. Therefore, only an output of a laser light incident upon one receiver can be obtained as a signal. It was found from the experiment that the light noise was reduced to about 0.6% in the usual light room and further the signal to noise ratio was improved up to 30 times at least as compared to a usual light shielding method. The method can then be effectively used under a well-lighted room such as a factory without noise light shielding cover.

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Real-time optical measuring system for dye colour and concentration—II. Dispersive dye

Ueda¹,

Matsumura²,

Kawazu³

et al. 1997

Optics and Lasers in Engineering

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A real-time measuring method of a dispersive dye, i.e. oil dye, has been developed which enables us to measure the concentration and its fluctuation of the three base colours. The method is based on the light scattering theory and its principle requires three different lasers having the three base colours. The system consisted of a semiconductor laser and argon ion laser for light sources, a photodiode for a light detector and a personal computer for data processing. Detection sensitivity for the dye concentration was about 1 mg I l and was applicable for practical use.

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Real-time optical monitoring system for dye colour and concentration

Cited by 4 publications

References 1 publication

A PMUT based photoacoustic system as a microfluidic concentration detector

A PMUT based photoacoustic system as a microfluidic concentration detector

Active light noise filter by a differential operation

Real-time optical measuring system for dye colour and concentration—II. Dispersive dye

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