Investigation of a pulsed waveguide piezoelectric pressure sensor

Surkaev, A. L.; Kul’kov, V. G.

doi:10.1134/s1063771006020163

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…By measuring propagation velocity and elastic wave damping factors, it is possible to determine the parameters such as elasticity, porosity, defectiveness, structural element size, anisotropy, and inhomogeneity. Use of acoustic waveguide for stress [19] and pressure [20] measurements in soil has also been reported. A steel--rod waveguide of 5 mm in diameter and 500 mm in length, excited by acoustic waves with a frequency changeable from 5 to 50 kHz was used to monitor the pressure in soil.…”

Section: Acoustic Geothermal Loggingmentioning

confidence: 99%

Waveguide-based ultrasonic and far-field electromagnetic sensors for downhole reservoir characterization.

Sheen¹,

Chien²,

Wang³

et al. 2010

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This report summarizes the first year research and development effort leading to development of high--temperature sensors for enhanced geothermal systems. It covers evaluation of ultrasonic and electromagnetic (EM) techniques applied to temperature measurement and flow characterization. On temperature measurement, we have evaluated both microwave radiometry and ultrasonic techniques for temperature gradient and profile measurements. Different antenna designs are evaluated and array loop antenna design is selected for further development. We have also evaluated ultrasonic techniques for total flow characterization, which includes using speed of sound to determine flow temperature, measuring acoustic impedance to estimate fluid density, and using cross--correlation technique to determine the mass flow rate. Method to estimate the flow enthalpy is briefly discussed. At end, the need and proposed techniques to characterize the porosity and permeability of a hot dry rock resource are presented.Waveguide--based ultrasonic and far--field electromagnetic sensors for downhole reservoir characterization ANL--10/34 ii Waveguide--based ultrasonic and far--field electromagnetic sensors for downhole reservoir characterization ANL--10/34 iii

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Section: Acoustic Geothermal Loggingmentioning

confidence: 99%

Waveguide-based ultrasonic and far-field electromagnetic sensors for downhole reservoir characterization.

Sheen¹,

Chien²,

Wang³

et al. 2010

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show abstract

“…In this paper, we propose a cardiac pulse system using PCS; this sensor is widely used in recent studies and fast processes. The PCS is used in studying pulsed disturbances of condensed media 7 due to its high sensitivity, high robustness, and low cost 8 . In the last two decades, interest in developing new technologies with the use of piezoelectric sensors has expanded 9 .…”

Section: Introductionmentioning

confidence: 99%

Heart Rate Detection using a Piezoelectric Ceramic Sensor: Preliminary results

Cepeda

Peluffo-Ordóñez

Rosero-Montalvo

et al. 2022

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Real-time vital signs monitoring, particularly heart rate, is essential in today's medical practice and research. Heart rate detection allows the doctor to monitor the patient's health status to provide immediate action against possible cardiovascular diseases. We present a possible alternative to traditional heart rate signal monitoring systems, a cardiac pulse system using low-cost piezoelectric signal identification. This system could benefit health care and develop continuous pulse waveform monitoring systems. This paper introduces a heartbeat per minute (BPM) cardiac pulse detection system based on a low-cost piezoelectric ceramic sensor (PCS). The PCS is placed under the wrist and adjusted with a silicone wristband to measure the pressure exerted by the radial artery on the sensor and thus obtain the patient's BPM. We propose a signal conditioning stage to reduce the sensor's noise when acquiring the data and make it suitable for real-time BPM visualization. As a comparison, we performed a statistical test to compare the low-cost PCS with types of traditional sensors, along with the help of 21 volunteers. Experimental results show that the data collected by the PCS, when used for heart rate detection, is highly accurate and close to traditional sensor measurements. Therefore, we conclude that the system efficiently monitors the cardiac pulse signal in BPM. Keywords: Heart rate; Piezoelectric, BPM; Pulse Detection.

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Investigation of a pulsed waveguide piezoelectric pressure sensor

Cited by 2 publications

References 1 publication

Waveguide-based ultrasonic and far-field electromagnetic sensors for downhole reservoir characterization.

Waveguide-based ultrasonic and far-field electromagnetic sensors for downhole reservoir characterization.

Heart Rate Detection using a Piezoelectric Ceramic Sensor: Preliminary results

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