A high resolution ultrasonic range measurement method using double frequencies and phase detection

Kimura, Tatsuya; Wadaka, Shusou; Misu, Koichiro; Nagatsuka, Tsutomu; Tajime, T.; Koike, Mayumi

doi:10.1109/ultsym.1995.495674

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Temperature calculation. To accurately measure the temperature of the gas, a method which the humidity effect on the speed of sound stated above and combine the technique of transmit/receipt ultrasonic signals of BFSK and continuous waves and obtain the average gas temperature form the data of TOF and phase shift was be used [6,7,8] .…”

Section: Measurement Methodsmentioning

confidence: 99%

Design of Ultrasonic Gas Temperature Measurement System with Humidity Self-Correction

Yao

Guan

Dong

2011

AMR

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In the ultrasonic gas temperature measurement system, the principle is that the velocity of sound in gas is a function of temperature. But because the propagation speed of ultrasonic wave can be easily affected by humidity, the accuracy of the gas temperature measurement will be affected too. This dissertation will implement the ultrasonic gas temperature measurement system with humidity correction suitable for all kinds of environment humidity. This type of ultrasonic technique is a highly efficient algorithm with the advantages of both time-of-flight method and phase shift method. And the system is realized with a single-chip microcomputer-based with a relative humidity/water vapor pressure meter. The main advantages of this ultrasonic temperature measurement system are high resolution, using narrow-bandwidth ultrasonic transducer of low cost and ease of implementation.

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Section: Measurement Methodsmentioning

confidence: 99%

Design of Ultrasonic Gas Temperature Measurement System with Humidity Self-Correction

Yao

Guan

Dong

2011

AMR

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“…A resolution of micrometer-order displacements using a phase-detection technique has already been reported. [5][6][7][8] To obtain a nanometer-order resolution, a higher signal-to-noise ratio of ultrasonic wave signals and/or higher-frequency measurements are required; however, these present difficulties in air. The main source of these difficulties is that the transmission efficiency of air-coupled ultrasonic transducers is not high, because of a high acoustic-impedance mismatching between the air and ultrasonic transducers.…”

Section: Introductionmentioning

confidence: 99%

Nanometer-Order Resolution Displacement Measurement System by Air-Coupled Ultrasonic Wave Introducing Maximum Phase-Sensitivity Tuning

Sasaki

Nishihira

Imano

2005

Jpn. J. Appl. Phys.

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We consider the kinetics of the diffusion process of an assembly of N o initially aggregated particles. The particles are non-interacting except that the double occupancy is forbidden. A computer simulation provides the number of distinct visited sites after a given number of steps performed by the particles on a 2D square grid. The particles are supposed to diffuse according to a random-walk process on the lattice where all jumps to the nearestneighbour sites are allowed. As the system exhibits a centrifugal diffusion the simulation shows that the number of distinct visited sites obeys three distinct successive processes. The first one which occurs right at the start of the diffusion involves a classic diffusion in the 2D space and correspondingly displays the classic Euclidean laws. Then the system exhibits a crossover to fractal-like kinetics and extends over at least three time decades where the exponent characteristic of the power law is determined by the number of distinct visited sites as a function of time. The third process takes places after a fractal to Euclidean space crossover has taken place when the particles are far enough from each other so as not to interfere any more, thereby leading to a classic diffusion process. The various singular points of these three processes have been determined analytically as functions of N o and of the exponent d, whereas the N o dependence of d is derived from the computer simulation. These results which are relevant to several significant physical situations shed a new light on the processes where the fractal nature of the kinetics depends on the initial conditions of the problem rather than on the mere geometry of the diffusion paths.

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“…Thus, only low-frequency measurements, around several tens of kHz can be made in air. In these situations, one possible approach for obtaining a resolution smaller than the ultrasonic wavelength λ is the phase detection technique [2]. However, few studies of the method of measuring nanometer order displacements have been reported [3].…”

Section: Introductionmentioning

confidence: 99%

Improved phase-detection method using an air-coupled ultrasonic wave for a few-tens of nanometers displacement measurements

Sasaki

Nishihira

Imano

2004

IEICE Electron. Express

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A high resolution ultrasonic range measurement method using double frequencies and phase detection

Cited by 6 publications

References 8 publications

Design of Ultrasonic Gas Temperature Measurement System with Humidity Self-Correction

Design of Ultrasonic Gas Temperature Measurement System with Humidity Self-Correction

Nanometer-Order Resolution Displacement Measurement System by Air-Coupled Ultrasonic Wave Introducing Maximum Phase-Sensitivity Tuning

Improved phase-detection method using an air-coupled ultrasonic wave for a few-tens of nanometers displacement measurements

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