Magneto-Impedance Sensor Driven by 400 MHz Logarithmic Amplifier
A thin-film magnetic field sensor is useful for detecting foreign matters and nanoparticles included in industrial and medical products. It can detect a small piece of tool steel chipping or breakage inside the products nondestructively. An inspection of all items in the manufacturing process is des...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-05-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/10/6/355 |
| _version_ | 1818413201330536448 |
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| author | Tomoo Nakai |
| author_facet | Tomoo Nakai |
| author_sort | Tomoo Nakai |
| collection | DOAJ |
| description | A thin-film magnetic field sensor is useful for detecting foreign matters and nanoparticles included in industrial and medical products. It can detect a small piece of tool steel chipping or breakage inside the products nondestructively. An inspection of all items in the manufacturing process is desirable for the smart manufacturing system. This report provides an impressive candidate for realizing this target. A thin-film magneto-impedance sensor has an extremely high sensitivity, especially, it is driven by alternatiing current (AC) around 500 MHz. For driving the sensor in such high frequency, a special circuit is needed for detecting an impedance variation of the sensor. In this paper, a logarithmic amplifier for detecting a signal level of 400 MHz output of the sensor is proposed. The logarithmic amplifier is almost 5 mm × 5 mm size small IC-chip which is widely used in wireless devices such as cell phones for detecting high-frequency signal level. The merit of the amplifier is that it can translate hundreds of MHz signal to a direct current (DC) voltage signal which is proportional to the radio frequency (RF)signal by only one IC-chip, so that the combination of a chip Voltage Controlled Oscillator (VCO), a magneto-impedance (MI) sensor and the logarithmic amplifier can compose a simple sensor driving circuit. |
| first_indexed | 2024-12-14T10:59:26Z |
| format | Article |
| id | doaj.art-5199c0d6558f4d18a7c5cab70fea82c1 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-12-14T10:59:26Z |
| publishDate | 2019-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-5199c0d6558f4d18a7c5cab70fea82c12022-12-21T23:04:47ZengMDPI AGMicromachines2072-666X2019-05-0110635510.3390/mi10060355mi10060355Magneto-Impedance Sensor Driven by 400 MHz Logarithmic AmplifierTomoo Nakai0Industrial Technology Institute, Miyagi Prefectural Government, Sendai 981-3206, JapanA thin-film magnetic field sensor is useful for detecting foreign matters and nanoparticles included in industrial and medical products. It can detect a small piece of tool steel chipping or breakage inside the products nondestructively. An inspection of all items in the manufacturing process is desirable for the smart manufacturing system. This report provides an impressive candidate for realizing this target. A thin-film magneto-impedance sensor has an extremely high sensitivity, especially, it is driven by alternatiing current (AC) around 500 MHz. For driving the sensor in such high frequency, a special circuit is needed for detecting an impedance variation of the sensor. In this paper, a logarithmic amplifier for detecting a signal level of 400 MHz output of the sensor is proposed. The logarithmic amplifier is almost 5 mm × 5 mm size small IC-chip which is widely used in wireless devices such as cell phones for detecting high-frequency signal level. The merit of the amplifier is that it can translate hundreds of MHz signal to a direct current (DC) voltage signal which is proportional to the radio frequency (RF)signal by only one IC-chip, so that the combination of a chip Voltage Controlled Oscillator (VCO), a magneto-impedance (MI) sensor and the logarithmic amplifier can compose a simple sensor driving circuit.https://www.mdpi.com/2072-666X/10/6/355magneto-impedance sensorthin-filmhigh frequencylogarithmic amplifiernondestructive inspection |
| spellingShingle | Tomoo Nakai Magneto-Impedance Sensor Driven by 400 MHz Logarithmic Amplifier Micromachines magneto-impedance sensor thin-film high frequency logarithmic amplifier nondestructive inspection |
| title | Magneto-Impedance Sensor Driven by 400 MHz Logarithmic Amplifier |
| title_full | Magneto-Impedance Sensor Driven by 400 MHz Logarithmic Amplifier |
| title_fullStr | Magneto-Impedance Sensor Driven by 400 MHz Logarithmic Amplifier |
| title_full_unstemmed | Magneto-Impedance Sensor Driven by 400 MHz Logarithmic Amplifier |
| title_short | Magneto-Impedance Sensor Driven by 400 MHz Logarithmic Amplifier |
| title_sort | magneto impedance sensor driven by 400 mhz logarithmic amplifier |
| topic | magneto-impedance sensor thin-film high frequency logarithmic amplifier nondestructive inspection |
| url | https://www.mdpi.com/2072-666X/10/6/355 |
| work_keys_str_mv | AT tomoonakai magnetoimpedancesensordrivenby400mhzlogarithmicamplifier |