Measuring System Sensitive to Amplitude and Phase of RF Magnetic Field Using LD and Optical Fiber

Ken-ichi HAYASHI; Kazuo ARAI; Yoshio IDA

Measuring System Sensitive to Amplitude and Phase of RF Magnetic Field Using LD and Optical Fiber

Ken-ichi HAYASHI, Kazuo ARAI, Yoshio IDA

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A novel measuring system on the amplitude and phase of the RF magnetic field is proposed. It is composed of a laser diode (LD) linked with a small loop antenna, an optical fiber transmission line, and phase-sensitive detection instruments. The LD output light is directly intensity-modulated by the RF current induced in the loop antenna by the RF magnetic field under test. The instantaneous amplitude and phase of the RF magnetic field are preserved in the modulated light because of the quick response of LD and are detected by the remote detection system. The characteristics of the calibration, the sensitivity, the minimum detectable field, and the frequency response are analyzed in detail. The system is highly sensitive, nonperturbing, and noninteractive. In addition to these advantages, the excellent property for measuring the phase of the RF magnetic field is experimentally confirmed by many field measurements. Resultantly, the minimum detectable RF magnetic field is obtained as 10 µA/cm (38 nW/cm² in power density) remarkably lower than others.

Publication: IEICE TRANSACTIONS on transactions Vol.E70-E No.2 pp.135-140

Publication Date: 1987/02/25

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Type of Manuscript: PAPER

Category: Instrumentation

Authors

Ken-ichi HAYASHI
Kazuo ARAI
Yoshio IDA

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Ken-ichi HAYASHI, Kazuo ARAI, Yoshio IDA, "Measuring System Sensitive to Amplitude and Phase of RF Magnetic Field Using LD and Optical Fiber" in IEICE TRANSACTIONS on transactions, vol. E70-E, no. 2, pp. 135-140, February 1987, doi: .
Abstract: A novel measuring system on the amplitude and phase of the RF magnetic field is proposed. It is composed of a laser diode (LD) linked with a small loop antenna, an optical fiber transmission line, and phase-sensitive detection instruments. The LD output light is directly intensity-modulated by the RF current induced in the loop antenna by the RF magnetic field under test. The instantaneous amplitude and phase of the RF magnetic field are preserved in the modulated light because of the quick response of LD and are detected by the remote detection system. The characteristics of the calibration, the sensitivity, the minimum detectable field, and the frequency response are analyzed in detail. The system is highly sensitive, nonperturbing, and noninteractive. In addition to these advantages, the excellent property for measuring the phase of the RF magnetic field is experimentally confirmed by many field measurements. Resultantly, the minimum detectable RF magnetic field is obtained as 10 µA/cm (38 nW/cm² in power density) remarkably lower than others.
URL: https://globals.ieice.org/en_transactions/transactions/10.1587/e70-e_2_135/_p

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@ARTICLE{e70-e_2_135,
author={Ken-ichi HAYASHI, Kazuo ARAI, Yoshio IDA, },
journal={IEICE TRANSACTIONS on transactions},
title={Measuring System Sensitive to Amplitude and Phase of RF Magnetic Field Using LD and Optical Fiber},
year={1987},
volume={E70-E},
number={2},
pages={135-140},
abstract={A novel measuring system on the amplitude and phase of the RF magnetic field is proposed. It is composed of a laser diode (LD) linked with a small loop antenna, an optical fiber transmission line, and phase-sensitive detection instruments. The LD output light is directly intensity-modulated by the RF current induced in the loop antenna by the RF magnetic field under test. The instantaneous amplitude and phase of the RF magnetic field are preserved in the modulated light because of the quick response of LD and are detected by the remote detection system. The characteristics of the calibration, the sensitivity, the minimum detectable field, and the frequency response are analyzed in detail. The system is highly sensitive, nonperturbing, and noninteractive. In addition to these advantages, the excellent property for measuring the phase of the RF magnetic field is experimentally confirmed by many field measurements. Resultantly, the minimum detectable RF magnetic field is obtained as 10 µA/cm (38 nW/cm² in power density) remarkably lower than others.},
keywords={},
doi={},
ISSN={},
month={February},}

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TY - JOUR
TI - Measuring System Sensitive to Amplitude and Phase of RF Magnetic Field Using LD and Optical Fiber
T2 - IEICE TRANSACTIONS on transactions
SP - 135
EP - 140
AU - Ken-ichi HAYASHI
AU - Kazuo ARAI
AU - Yoshio IDA
PY - 1987
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E70-E
IS - 2
JA - IEICE TRANSACTIONS on transactions
Y1 - February 1987
AB - A novel measuring system on the amplitude and phase of the RF magnetic field is proposed. It is composed of a laser diode (LD) linked with a small loop antenna, an optical fiber transmission line, and phase-sensitive detection instruments. The LD output light is directly intensity-modulated by the RF current induced in the loop antenna by the RF magnetic field under test. The instantaneous amplitude and phase of the RF magnetic field are preserved in the modulated light because of the quick response of LD and are detected by the remote detection system. The characteristics of the calibration, the sensitivity, the minimum detectable field, and the frequency response are analyzed in detail. The system is highly sensitive, nonperturbing, and noninteractive. In addition to these advantages, the excellent property for measuring the phase of the RF magnetic field is experimentally confirmed by many field measurements. Resultantly, the minimum detectable RF magnetic field is obtained as 10 µA/cm (38 nW/cm² in power density) remarkably lower than others.
ER -