Noise-tolerant ultrasonic distance sensor based on a multiple driving approach

Grimaldi, U.; Parvis, Marco

doi:10.1016/0263-2241(94)00034-5

Cited by 16 publications

(7 citation statements)

References 6 publications

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“…Approximate coefficients are left at the end of the decomposition, giving a low-frequency projection of the signal. For an optimal Ψ(t), u ( t ) will have projections of higher magnitude at certain scales, while n ( t ) will have negligible projections across all scales, and can be eliminated with appropriate thresholding techniques (eq ). The resultant coefficients ( WT ′ s ,τ ) can be brought back in time domain by inverse wavelet transform (IWT), leading to elimination of unwanted signal components (noise). …”

Section: System Overview Signal Conditioning and Interface Edge Detec...mentioning

confidence: 99%

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Ultrasonic Method for Online Tracking of Interface and Dispersion Band in Gravity Settlers

Mukherjee

Sen

Singh

et al. 2020

Ind. Eng. Chem. Res.

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Liquid−liquid solvent extraction process consists of dispersion of one phase into another in the form of fine drops and allowing the solute of interest to migrate from one phase into the other. Subsequently, it is essential to separate the two phases for further processing. In this regard, it is critical to continuously monitor the interface of two liquid phases as entrainment of one phase with another will lead to severe issues in downstream equipment and processes to follow. In this regard, an ultrasonic (UT) based online interface tracking device is developed which can detect the top layer of liquid−liquid interface (30% TBP/DD and water containing trace amounts of uranium) as well as estimate its dispersion thickness. This has been achieved using a single minimally invasive sensor. A novel signal-processing algorithm is developed to denoise and extract meaningful parameters for this estimation from the reflected and highly scattered/attenuated UT signal. The paper reports development of a mathematical model of the algorithm, experimental setup, and validation of the proposed system in a batch gravity settler.

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Section: System Overview Signal Conditioning and Interface Edge Detec...mentioning

confidence: 99%

Section: System Overview Signal Conditioning and Interface Edge Detec...mentioning

confidence: 99%

Ultrasonic Method for Online Tracking of Interface and Dispersion Band in Gravity Settlers

Mukherjee

Sen

Singh

et al. 2020

Ind. Eng. Chem. Res.

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“…1. The best signal to employ under any condition therefore depends on the actual amount of noise [11].…”

Section: A Time Of Flight Measurementmentioning

confidence: 99%

“…The sensor contains a simple noise measuring system that estimates the actual noise by monitoring the input signal during echo-free intervals. The noise measuring system output is used to switch between three optimal signals, which are tailored for good results in low, medium, and high noise conditions, as described in [11].…”

Section: A Time Of Flight Measurementmentioning

confidence: 99%

“…The DAC voltage reference is obtained by summing a fixed reference to a calibrated fraction of the voltage produced by the temperature sensor, thus producing a voltage proportional to the temperature according to the formula (11) By adjusting the values of the coefficient , it is possible to obtain a change with the temperature that partially compensates for the velocity of the sound change. The compensation is not complete, since the velocity of sound varies with the square root of the temperature and the reference voltage changes linearly with the temperature.…”

Section: B Temperature Measurement and Distance Estimationmentioning

confidence: 99%

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An ultrasonic sensor for distance measurement in automotive applications

2001

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This paper describes an ultrasonic sensor that is able to measure the distance from the ground of selected points of a motor vehicle. The sensor is based on the measurement of the time of flight of an ultrasonic pulse, which is reflected by the ground. A constrained optimization technique is employed to obtain reflected pulses that are easily detectable by means of a threshold comparator. Such a technique, which takes the frequency response of the ultrasonic transducers into account, allows a sub-wavelength detection to be obtained. Experimental tests, performed with a 40 kHz piezoelectric-transducer based sensor, showed a standard uncertainty of 1 mm at rest or at low speeds; the sensor still works at speeds of up to 30 m/s, although at higher uncertainty. The sensor is composed of only low cost components, thus being apt for first car equipment in many cases, and is able to self-adapt to different conditions in order to give the best results.

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A novel fuzzy inspired machine learning framework for relative humidity estimation using time-of-flight of ultrasonic sensor

Sahoo

Udgata

2022

Measurement

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Noise-tolerant ultrasonic distance sensor based on a multiple driving approach

Cited by 16 publications

References 6 publications

Ultrasonic Method for Online Tracking of Interface and Dispersion Band in Gravity Settlers

Ultrasonic Method for Online Tracking of Interface and Dispersion Band in Gravity Settlers

An ultrasonic sensor for distance measurement in automotive applications

A novel fuzzy inspired machine learning framework for relative humidity estimation using time-of-flight of ultrasonic sensor

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