Highly Sensitive Measurement of Moisture Content Using HTS-SQUID

Tsukada, Keiji; Kiwa, Toshihiko; Tahara, Hirokazu; Miyake, E.; Yamada, H.; Tsukamoto, Akira; Kandori, Akihiko

doi:10.1109/tasc.2009.2019659

Cited by 20 publications

(11 citation statements)

References 11 publications

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“…To assure stable operation of the HTS‐SQUID, the Dewar vessel is placed within a magnetic shield made of double‐layer Permalloy, and ambient magnetic noise is reduced by enclosing the entire device in a magnetic shield. The detection methods include a direct detection method that detects a magnetic field using the SQUID directly and a separation method in which the magnetic field is detected by a magnetically coupled pickup coil . In order to improve the S/N ratio of the system, we used the separation method with a first‐order differential pickup coil in the detector.…”

Section: Measurement Systemmentioning

confidence: 99%

Compact AC/DC Susceptometer Using a High‐Temperature Superconducting Quantum Interference Device

Takagi

Saari

Sakai

et al. 2016

Elect Comm in Japan

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SUMMARY We developed a compact susceptometer employing a high‐temperature superconductor (HTS) superconducting quantum interference device (SQUID) that can measure the M–H characteristics and the harmonic components induced in the ac magnetic field response from a sample. In the dc function for measuring M–H characteristics, the sample was vibrated in a dc magnetic field, and the secondary magnetic field generated from the sample was detected by a dc pickup coil. In the ac function for measuring harmonic components, the sample placed in an ac magnetic field, and the ac response was detected by an ac pickup coil. The pickup coil is connected in series with the input coil, which is inductively connected to the HTS‐SQUID. A signal from the HTS‐SQUID was transmitted to a lock‐in amplifier and was analyzed as the intensity and phase of the measured magnetic field. In order to clarify the basic properties of the system, we measured the ac magnetic field response from a sample while varying the relative positions of the sample and the pickup coil, and the M–H characteristics while varying the dc bias magnetic field intensity. Furthermore, by analyzing the harmonic components of the ac/dc magnetic field response, the proposed system can measure magnetic field properties with high sensitivity and at high speed.

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Section: Measurement Systemmentioning

confidence: 99%

Compact AC/DC Susceptometer Using a High‐Temperature Superconducting Quantum Interference Device

Takagi

Saari

Sakai

et al. 2016

Elect Comm in Japan

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“…The determination of moisture in honey by its refractive index is not new, and it has been known since almost a century ago [ 1 ]. Since then, various techniques have been used to determine the percentage of moisture in various materials among which are coil [ 2 ], soil [ 3 , 4 ], nuts and grain [ 5 ], oil palm fruits [ 6 ], foliage [ 7 ], and rice grains [ 8 ]. A microwave resonator has also been used to measure the moisture in polymers [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Use of the Composite Properties of a Microwave Resonator to Enhance the Sensitivity of a Honey Moisture Sensor

Reyes-Ayona

Gallegos-Arellano²,

Sierra-Hernández

2021

Sensors

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A moisture sensor based on a composite resonator is used to measure different honey samples, which include imitation honey. The sensor changes its frequency response in accordance with the dielectric permittivity that it detects in the measured samples. Although reflectometry sensors have been used to measure the percentage of moisture in honey for almost a century, counterfeiters have achieved that their apocryphal product is capable of deceiving these kinds of sensors. Metamaterial features of the composite resonators are expected to improve their response when detecting lossy samples such as organic samples. It is also sought that these sensors manage to detect small differences not only in the real parts of the dielectric permitivities of samples but also in their imaginary parts, and, thus, the sensors are able to discern between real honey and slightly altered honey. Effectively, not only was it possible to improve the response of the sensors by using lossy samples but it was also possible to identify counterfeit honey.

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“…We have reported the magnetic properties of magnetic nanoparticles in solution and their influence on the diamagnetism of water [12]. Another application to mixtures of materials with different magnetic properties has been reported for moisture content measurement using a magnetometer [13,14]. For instance, mortar is a mixture of cement, sand, and water; however, despite bring such a complex material, both the moisture content and the hydration change of mortar can be measured with a magnetometer [15].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Type HTS-SQUID Magnetometer With Vibrating and Rotating Sample

Tsukada

Morita

Matsunaga

et al. 2016

IEEE Trans. Appl. Supercond.

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Highly sensitive measurement of the very weak magnetic characteristics of magnetic particles in solution or of a solution itself is required for applications such as biomedical examinations. In this study, higher sensitivity and additional performance with relaxation measurement and harmonic signal detection were achieved by improvement of the driving mechanism and high resolution electric magnet, and optimization of the superconducting quantum interference device (SQUID) detection unit. A servomotor was used for sample vibration and rotation with precise control and high speed. For detection of the M-H characteristics, the sample was vibrated under the magnetic field in the electromagnet. For measuring the relaxation of the magnetization, the sample was rotated. A first-order differential pickup coil with a normal conducting wire connected to the input coil of a high temperature superconductor (HTS)-SQUID was used to detect the magnetic signal from the sample. High resolution measurement of the magnetic moment in the order of 10 -11 A m 2 was achieved with this system configuration. An AC magnetic field with a DC bias could then be applied to the sample for detection of the harmonic signal. The magnetic relaxation signal from the sample was measured by another of the same type of differential detection coil equipped outside of the electric magnet by rotating instead of vibrating the sample. Magnetization curve for a lowconcentration of iron nanoparticles with superparamagnetic character in solution was successfully measured using the developed magnetometer, and the relaxation phenomenon was also characterized.  Index Terms-magnetic susceptibility, SQUID, magnetometer, magnetization, Brownian relaxation.

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Highly Sensitive Measurement of Moisture Content Using HTS-SQUID

Cited by 20 publications

References 11 publications

Compact AC/DC Susceptometer Using a High‐Temperature Superconducting Quantum Interference Device

Compact AC/DC Susceptometer Using a High‐Temperature Superconducting Quantum Interference Device

Use of the Composite Properties of a Microwave Resonator to Enhance the Sensitivity of a Honey Moisture Sensor

Hybrid Type HTS-SQUID Magnetometer With Vibrating and Rotating Sample

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