Further Study of the Sensing Ring Position on the Orifice-Type Capacitive Flow Sensor

Mandal, Haraprasad; Bera, Saikat Kumar; Sadhu, Pradip Kumar; Bera, Santu

doi:10.1109/tim.2019.2913060

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…The ratio of the capacitances 𝐶 1 and 𝐶 2 can be estimated using (8). However, if a ratio-metric computation of 𝑓 1 and 𝑓 2 , as in (9), is performed, the ratio-metric output due to 𝐶 1 and 𝐶 2 is obtained.…”

Section: 𝜕𝑣 𝑜𝑖2mentioning

confidence: 99%

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A Closed-Loop Capacitance-to-Frequency Converter for Single-Element and Differential Capacitive Sensors

Areekath

George

Reverter

2020

IEEE Trans. Instrum. Meas.

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A novel closed-loop switched-capacitor (SC) capacitance-to-frequency converter (CFC) is presented in this paper. The proposed CFC is capable of measuring from either a single-element or a differential capacitive sensor, providing ratio and ratio-metric outputs, respectively. Most of the existing autobalancing schemes for capacitive sensors use the closed-loop approach but require precise sinusoidal AC excitation and provide an analog output that is sensitive to parasitic capacitances. Also, the use of voltage-controlled resistors (VCR) in many of these schemes limits the linearity and accuracy of their output. The SC-CFC presented in this paper, employs a simple DC reference for excitation, and gives a digital output that is insensitive to parasitic capacitances, by virtue of design. Additionally, the output is linear, irrespective of the sensor characteristic, and independent of the nominal value of the sensor. This feature, along with its compatibility with singleelement and differential capacitive sensors, facilitates its ease of integration with a wide range of capacitive sensors. The CFC has a one-time correction mechanism that significantly reduces the impact of component mismatch. The prototype of the proposed scheme exhibits a maximum non-linearity error (NLE) of 0.24%, a resolution of 12.59 effective number of bits (ENOB), and a rise time of 6 ms. In addition, the proffered design is fit for integrated circuit (IC) fabrication as it employs a switched-capacitor approach.

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Section: 𝜕𝑣 𝑜𝑖2mentioning

confidence: 99%

“…Single-element capacitive ." sensors with various electrode structures are used to sense touch [3], proximity [4], position [5], pressure [6], humidity [7], flow [8], and level [9]. Differential capacitive sensors (DCS) constitute another important category of capacitive sensors.…”

Section: Introductionmentioning

confidence: 99%

A Closed-Loop Capacitance-to-Frequency Converter for Single-Element and Differential Capacitive Sensors

Areekath

George

Reverter

2020

IEEE Trans. Instrum. Meas.

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“…The effect of electrode position in polarization electrode impedance type flow transducer for a conducting liquid has been studied by Bhar et al [5] and from this study, they have proposed a particular arrangement of electrode position which can provide better sensitivity. Mandal et al [6] have studied the basic principle of orifice type capacitive flow transducer and the effect of sensing ring position on the sensor capacitance. It has been shown that the sensor capacitance-sensing ring distance product increases linearly with the increase of sensing ring distance from the orifice.…”

Section: Introductionmentioning

confidence: 99%

Study of a Modified Obstruction Free Pressure Sensor Based Flow Transducer Using Hall Sensors

Mandal¹,

Mondal²,

Bera³

2021

I2M

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In the present paper, a modified obstruction free pressure sensor-based flow transducer has been developed using Hall sensors. This technique is a modified version of the earlier inductive method. In this transducer, the fluid pressure in the pipeline is taken as the flow sensing parameter, and various drawbacks of the earlier inductive technique are eliminated. A prototype unit of the transducer is developed and studied in the present work. The transducer consists of two identical C-type Bourdon gauges, each fitted with an identical permanent magnet and Hall sensor assembly to sense the fluid pressure under flow condition and static pressure under no flow condition. The difference between the two Hall sensor outputs is found to vary nonlinearly with flow rate. The mathematical relations describing the working of the prototype unit are derived in the paper. The static characteristic curves of the proposed flow transducer are determined experimentally and reported in the paper. The characteristic curves are found to follow the derived equations to a very good extent with negligible percentage deviation from best-fit nonlinear characteristic.

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Further Study of the Sensing Ring Position on the Orifice-Type Capacitive Flow Sensor

Cited by 2 publications

References 13 publications

A Closed-Loop Capacitance-to-Frequency Converter for Single-Element and Differential Capacitive Sensors

A Closed-Loop Capacitance-to-Frequency Converter for Single-Element and Differential Capacitive Sensors

Study of a Modified Obstruction Free Pressure Sensor Based Flow Transducer Using Hall Sensors

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