Magnetoacoustic remote query temperature and humidity sensors

Jain, Mahaveer K.; Schmidt, S.; Ong, Keat Ghee; Mungle, Casey; Grimes, Craig A.

doi:10.1088/0964-1726/9/4/314

Cited by 73 publications

(60 citation statements)

References 18 publications

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“…10 shows the increase in humidity decreases the resonant frequency. In addition to TiO 2 , alumina (Al 2 O 3 ) was also used as a coating for humidity monitoring [5], and the results are similar to that of TiO 2 . Relative Humidity % Figure 10.…”

Section: Humidity Monitoringmentioning

confidence: 80%

“…Magnetoelastic sensors have attracted considerable interest within the sensor community as they form an excellent sensor platform that can be used to measure a wide range of environmental parameters including pressure [1][2][3], humidity [3][4][5], temperature [5][6], liquid viscosity and density [7][8][9][10], thin-film elasticity [11], and chemicals such as carbon dioxide [12][13], ammonia [14], and pH [15]. Magnetoelastic sensors are typically made of amorphous ferromagnetic ribbons or wires, mostly iron-rich alloys such as Fe 40 Ni 38 Mo 4 B 18 (Metglas brand 2826MB) and Fe 81 B 13.5 Si 3.5 C 2 (Metglas 2605SC) ribbons [15] that have a high mechanical tensile strength (~1000-1700 MPa), and a low material cost allowing them to be used on a disposable basis.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wireless Magnetoelastic Resonance Sensors: A Critical Review

Grimes

Mungle

Zeng

et al. 2002

Sensors

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194

159

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This paper presents a comprehensive review of magnetoelastic environmental sensor technology; topics include operating physics, sensor design, and illustrative applications. Magnetoelastic sensors are made of amorphous metallic glass ribbons or wires, with a characteristic resonant frequency inversely proportional to length. The remotely detected resonant frequency of a magnetoelastic sensor shifts in response to different physical parameters including stress, pressure, temperature, flow velocity, liquid viscosity, magnetic field, and mass loading. Coating the magnetoelastic sensor with a mass changing, chemically responsive layer enables realization of chemical sensors. Magnetoelastic sensors can be remotely interrogated by magnetic, acoustic, or optical means. The sensors can be characterized in the time domain, where the resonant frequency is determined through analysis of the sensor transient response, or in the frequency domain where the resonant frequency is determined from the frequency-amplitude spectrum of the sensor.

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Section: Humidity Monitoringmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Wireless Magnetoelastic Resonance Sensors: A Critical Review

Grimes

Mungle

Zeng

et al. 2002

Sensors

Self Cite

194

159

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“…An array of multiple magnetic ribbons, each having different lengths and non-overlapping operational frequency ranges and coated with a different gas sensing layer, can be used for this purpose to simultaneously measure multiple gas concentrations, such as humidity and Pam. For example, a humidity sensor can be fabricated by coating a magnetic ribbon with a thin film that is highly responsive to humidity, such as Al2O3 4) . Using the output of this sensor to calibrate for humidity, an absolute Pam value can be determined from the PEDOT/PSS-coated sensor.…”

Section: The Theoretical Variations Of Magnetization M and Fhmentioning

confidence: 99%

Application of Magnetic Ribbon Coated with Poly(3,4-ethylenedioxythiophene)/Poly(4-styrenesulfonate) to a Wireless Ammonia Sensor

et al. 2013

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This paper describes a wireless ammonia sensor that employs the resonance frequency change in a curved magnetic ribbon coated with poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS). As PEDOT/PSS expands due to the sorption of ammonia molecules, the curvature of the ribbon is decreased with increasing ammonia concentration, Pam. The decrease in curvature reduces the mechanical resonance frequency from 105 kHz at Pam = 0% to 89 kHz at Pa= 10%. We also confirmed that the resonance frequency is proportional to the curvature and that the proportional constant is 0.33 kHz/m -1 . Since the mechanical vibration of the ribbon is excited by applying AC and DC fields and is detected by monitoring the voltage induced on a pickup coil, the Pam value around the ribbon can be detected wirelessly.

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“…That is the working principle of a magnetoelastic sensor. [16][17][18][19] This kind of sensors allow a high degree of specificity, by functionalizing the sensing material to make it react with an specific agent of the media, as can be certain gases (e.g., humidity 20 or co 2 sensors, 21 ), chemical or biological agents (pH, 22 blood coagulation, 23,24 lipoproteins, 25 ) and stress, 26 or viscosity sensors. 27 Their versatility and the fact of being interrogated without physical contacts, make those sensors very suitable and useful for several applications in different fields.…”

mentioning

confidence: 99%

Bias free magnetomechanical coupling on magnetic microwires for sensing applications

Herrero-Gómez¹,

Marı́n²,

Hernando³

2013

Applied Physics Letters

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In the present paper, we report a systematic study of the magnetoelastic resonance of amorphous magnetic microwires of composition Fe 73 Si 11 B 13 Nb 3 . The study was performed for samples annealed at different temperatures. It was observed that such microwires present the key feature of performing magnetoelastic resonance in the absence of applied field. This fact, in addition to their small size, gives the microwires unique advantages over the widespreaded ribbons, currently in use as magnetoelastic sensors. Beyond the study of the resonance, magnetic properties of the samples were studied by means of Vibrating Sample Magnetometer (VSM) measurement in order to find an explanation to their bias-free resonance property. Finally, we show two possible applications of microwire based magnetoelastic sensors, a fluid density sensor and a mass-loading sensor. In recent years, much interest and effort has been devoted to develop soft magnetic materials due to their technological potential. 1 The main use of these materials can be found in the sensing industry which includes a broad spectrum of applications ranging from the automotive, mobile communication, chemistry and biochemistry industry among many others. [2][3][4][5] Amorphous microwires are one of the most widely studied soft materials. They are fabricated by means of extracting melt-spinning Taylor technique. 6 Those microwires are composed by a metallic core and a Pyrex cover both in the lm range. The metallic core provides the magnetic behaviour while the cover has a protective and stress-inducting function. 7 The ratio between the total diameter and the magnetic core, often called aspect ratio, is one of the key parameters of such microwires, since magnetic properties depend dramatically on it. For high values of the aspect ratio, the microwires present a bistable hysteresis loop, while this bistability vanishes for low ones. 8,9 In fact, amorphous or nanocrystalline magnetic microwires are among the softest materials. Many properties of these materials have been deeply studied both from the point of view of the basic physics and the applications. 10,11 This is the case of the giant magnetoimpedance effect, 12 biestability, 13 and ferromagnetic resonance. 14 However, the magnetoelastic resonance of those materials was only thoughtfully considered a few years ago. 15 It is well known that amorphous magnetostrictive alloys present magnetoelastic nature, so those materials may perform magnetoelastic resonance when exposed to a timevarying magnetic field. The physical parameters that describe this resonance, such as the resonance frequency, the amplitude, and the damping, are functions of the material environment. For this reason, their monitorization may be used to obtain information about the media. That is the working principle of a magnetoelastic sensor. [16][17][18][19] This kind of sensors allow a high degree of specificity, by functionalizing the sensing material to make it react with an specific agent of the media, as can be certain gases (e.g., humid...

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Magnetoacoustic remote query temperature and humidity sensors

Cited by 73 publications

References 18 publications

Wireless Magnetoelastic Resonance Sensors: A Critical Review

Wireless Magnetoelastic Resonance Sensors: A Critical Review

Application of Magnetic Ribbon Coated with Poly(3,4-ethylenedioxythiophene)/Poly(4-styrenesulfonate) to a Wireless Ammonia Sensor

Bias free magnetomechanical coupling on magnetic microwires for sensing applications

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