Temperature Drift Reduction Method of an Eddy Current Displacement Sensor

Matsumura, Noriaki; Mizoguchi, Masahiro; Machida, H.; Nakahara, Takafumi

doi:10.1541/ieejfms.126.169

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Thus, temperature variation may have a great impact on the output signals, because the electrical properties of metal material under test can be easily changed by temperature. Matsumura et al [30] have analyzed temperature drift of an eddy current displacement sensor and proposed the temperature drift reduction method. Wang and Feng [31] have proposed a self-temperature compensation method for eddy current displacement sensor.…”

Section: Introductionmentioning

confidence: 99%

Temperature-compensated rosette eddy current array sensor (TC-RECA) using a novel temperature compensation method for quantitative monitoring crack in aluminum alloys

Chen

et al. 2017

Smart Mater. Struct.

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This paper investigates effects of temperature variation on output signal of rosette eddy current array (RECA) sensor and proposes a new RECA sensor with temperature compensation capability for quantitative monitoring crack of bolt-jointed structures. A temperature simulation experiment shows that temperature variation has a great influence on output signal AR of RECA sensor as crack does and even results in false alarm when environment temperature changes. Temperature-compensated RECA (TC-RECA) sensor using the new output signal ΔC considering impacts of conductivity and lift-off is developed to eliminate impacts of temperature variation on monitoring process. Then, the relation between crack length and output signal ΔC is obtained by an online monitoring experiment, which shows TC-RECA sensor can quantitatively monitor crack with an accuracy of 1 mm. Then, a temperature simulation experiment is performed to verify the sensor’s ability to eliminate effects of temperature variation on monitoring process. Results shows that output signal ΔC just changes within about 0.5% when temperature changes from −20 °C to 70 °C, which has no effects on monitoring process. Finally, a crack monitoring experimental of a bolt-jointed structure under temperature disturbance is performed to verify the sensor’s abilities of quantitative monitoring crack of bolt-jointed structures and temperature compensation. It can be concluded that TC-RECA sensor has the ability to eliminate effects of temperature variation and can quantitatively monitor crack of bolt-jointed structures with an accuracy of 1 mm.

show abstract

Section: Introductionmentioning

confidence: 99%

Temperature-compensated rosette eddy current array sensor (TC-RECA) using a novel temperature compensation method for quantitative monitoring crack in aluminum alloys

Chen

et al. 2017

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

Temperature drift at low temperatures and development of bearingless motor

KATO,

KOMORI

2023

Journal of the Japan Society of Applied Electromagnetics and Me

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This paper proposes an axial type bearingless motor using zero power control as a low-cost magnetic bearing assuming temperature drift at low temperatures. A bearingless motor is a motor that functions as a bearing and can support the rotor without contact. The proposed bearingless motor is a one-degree-of-freedom axial type bearingless motor that is actively controlled only in the axial direction of the rotor using an eddy-current displacement sensor. Other degrees of freedom are passively controlled with permanent magnet bearings. In addition, zero-power control is used to solve the problem of temperature drift, in which the output of the eddy-current displacement sensor changes depending on the temperature. As a result, a bearingless motor with only one eddy current displacement sensor and requiring no sensor calibration from room temperature to liquid nitrogen temperature has been developed, and its drive has been verified by experiments using liquid nitrogen.

show abstract

Temperature Drift Reduction Method of an Eddy Current Displacement Sensor

Cited by 2 publications

References 3 publications

Temperature-compensated rosette eddy current array sensor (TC-RECA) using a novel temperature compensation method for quantitative monitoring crack in aluminum alloys

Temperature-compensated rosette eddy current array sensor (TC-RECA) using a novel temperature compensation method for quantitative monitoring crack in aluminum alloys

Temperature drift at low temperatures and development of bearingless motor

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