Characteristics measurement device for object to be measured and characteristics measurement method for object to be measured

Inventors

Ito, Kazuma • Niimi, Nobuo • Ikushima, Kenji

Assignees

Japan Science and Technology Agency

Abstract

A characteristics measurement device for an object according to the invention comprises a sound wave generator that emits a sound wave; a receiver that receives from the object an electromagnetic field generated by the sound wave being irradiated to the object; a sound wave medium between the sound wave generator and the object the electromagnetic field separated from a reverberating electromagnetic field caused by reverberating vibrations of the sound wave generator in time; an inverse diffuse that inversely diffuses the electromagnetic field received by the receiver using a reference signal associated with the sound wave; and a measurement unit that extracts at least one characteristic selected from a group consisting of electrical characteristics, magnetic characteristics, electromechanical characteristics and magnetomechanical characteristics of the object based on at least one measurement selected from a group consisting of intensity, phase and frequency of the inversely diffused electromagnetic field.

Core Innovation

A characteristics measurement device and method for an object to be measured use a reference signal generator that generates a reference signal based on predetermined information, and a sound wave generator that emits a sound wave generated based on the reference signal. A receiver receives an electromagnetic field generated by the sound wave being irradiated to the object to be measured, and an inverse diffuser inversely diffuses the electromagnetic field received by the receiver using the reference signal.

The device and method synchronously add the electromagnetic field inversely diffused a predetermined number of times. Based on at least one measurement selected from intensity, phase and frequency of the inversely diffused electromagnetic field added by the synchronous adder, a measurement unit extracts at least one characteristic selected from electrical characteristics, magnetic characteristics, electromechanical characteristics and magnetomechanical characteristics of the object to be measured.

The inverse diffuser output is used as an inversely diffused electromagnetic field for further processing, and the inverse diffusion produces a pulse compression signal via correlation with the reference signal. The reference signal is described using predetermined information such as information having an impulsive autocorrelation characteristic using an M-sequence or a complementary sequence, and information on which frequency varies continuously with time.

Claims Coverage

The provided set includes two independent claims, one device claim and one method claim. Across the independent claims, the inventive features focus on generating a reference signal based on predetermined information, emitting a sound wave based on the reference signal, receiving an electromagnetic field, inversely diffusing the received electromagnetic field using the reference signal, synchronously adding the inversely diffused electromagnetic field, and extracting characteristics using intensity, phase and/or frequency.

Across both independent claims, the core claim coverage centers on generating a reference signal from predetermined information, emitting a sound wave based on that reference signal, receiving an electromagnetic field generated by the irradiated sound wave, inversely diffusing the received electromagnetic field using the reference signal, synchronously adding the inversely diffused electromagnetic field a predetermined number of times, and extracting electrical, magnetic, electromechanical, and magnetomechanical characteristics using intensity, phase and/or frequency.

Stated Advantages

Documented Applications