Dielectric spectroscopy measuring device and dielectric spectroscopy measuring method
A dielectric spectroscopy measuring device includes a signal generation unit that generates electromagnetic waves, a signal separation unit that separate the electromagnetic waves according to a transmission direction and outputs the separated electromagnetic waves to an output destination corresponding to the transmission direction, a changeover switch unit that receives the electromagnetic waves generated by the signal generation unit via the signal separation unit, switches an output destination, and outputs the received electromagnetic waves, and outputs electromagnetic waves returning from the output destination to the signal separation unit, a sensor unit that irradiates a measurement target with the electromagnetic waves output by the changeover switch unit, and outputs measurement target waves obtained by irradiation to the changeover switch unit, a calibration standard unit including a circuit for calibration standard, the circuit outputting reflected waves for calibration generated by receiving the electromagnetic waves output by the changeover switch unit to the changeover switch unit, a signal reception unit that receives the measurement target waves and the reflected waves for calibration via the signal separation unit, and an operation unit that receives a measurement value output by the signal reception unit receiving the measurement target waves and the reflected waves for calibration, and corrects the received measurement value of the measurement target on the basis of the measurement value corresponding to the received reflected waves for calibration.
1 . A dielectric spectroscopy measuring device comprising:
a signal generator configured to generate electromagnetic waves;
a signal separator configured to separate the electromagnetic waves according to a transmission direction and output the separated electromagnetic waves to an output destination corresponding to the transmission direction;
a changeover switch configured to receive the electromagnetic waves generated by the signal generator via the signal separator, switch an output destination, and output the received electromagnetic waves, and to output electromagnetic waves returning from the output destination to the signal separator;
a sensor configured to irradiate a measurement target with the electromagnetic waves output by the changeover switch, and output measurement target waves obtained by irradiation to the changeover switch;
a calibration standard including a circuit for a calibration standard, the circuit outputting reflected waves for calibration generated by receiving the electromagnetic waves output by the changeover switch to the changeover switch;
a signal receiver configured to receive the measurement target waves and the reflected waves for calibration via the signal separator; and
an operator configured to receive a measurement value output by the signal receiver receiving the measurement target waves and the reflected waves for calibration, and correct the received measurement value of the measurement target on the basis of the measurement value corresponding to the received reflected waves for calibration,
wherein the signal generator, the signal receiver, the changeover switch, the sensor, and the signal separator are formed on one circuit board as a dielectric spectrometer,
wherein the signal generation unit configured to generate the electromagnetic waves from after the switching of an output destination by the changeover switch unit until before the next switching.
2 . The dielectric spectroscopy measuring device according to claim 1 ,
wherein the circuits included in the calibration standard include any one or all of an open circuit configured to bring a tip of a transmission line connected to the circuit into an open state, a short circuit configured to bring the tip of the transmission line connected to the circuit into a short-circuited state, and a termination circuit configured to bring the tip of the transmission line connected to the circuit into a terminated state.
3 . The dielectric spectroscopy measuring device according to claim 2 ,
wherein, when the circuits included in the calibration standard are all of the open circuit, the short circuit, and the termination circuit, the changeover switch connects three circuits including the open circuit, the short circuit, and the termination circuit to each of the sensors through switching, and
the operator
corrects the measurement value of the measurement target on the basis of the measurement value corresponding to the reflected waves for calibration of each of the three circuits and a known true value of the reflection coefficient of each of the three circuits.
4 . The dielectric spectroscopy measuring device according to claim 2 ,
wherein, when any one of the circuits included in the calibration standard is determined to be any one of the open circuit, the short circuit, and the termination circuit in advance, the changeover switch connects the one circuit determined in advance to the sensor through switching, and
the operator
corrects the measurement value of the measurement target by dividing the measurement value of the measurement target by the measurement value corresponding to the reflected waves for calibration of the one circuit determined in advance.
5 . The dielectric spectroscopy measuring device according to claim 1 ,
wherein the calibration standard is formed on the circuit board, or the calibration standard is connected to the circuit board.
6 . The dielectric spectroscopy measuring device according to claim 1 ,
wherein the operator
calculates a difference in transmission loss and phase difference between a path leading to the sensor via the changeover switch and a path leading to the circuit of the calibration standard via the changeover switch in advance, and corrects the measurement value of the measurement target on the basis of the difference in the transmission loss and the phase difference calculated in advance and the measurement value of the reflected waves for calibration.
7 . A dielectric spectroscopy measuring device comprising:
a signal generator configured to generate electromagnetic waves;
a signal separator configured to separate the electromagnetic waves according to a transmission direction and output the separated electromagnetic waves to an output destination corresponding to the transmission direction;
a changeover switch configured to receive the electromagnetic waves generated by the signal generator via the signal separator, switch an output destination, and output the received electromagnetic waves, and to output electromagnetic waves returning from the output destination to the signal separator;
a sensor configured to irradiate a measurement target with the electromagnetic waves output by the changeover switch, and output measurement target waves obtained by irradiation to the changeover switch;
a calibration standard including a circuit for a calibration standard, the circuit outputting reflected waves for calibration generated by receiving the electromagnetic waves output by the changeover switch to the changeover switch;
a signal receiver configured to receive the measurement target waves and the reflected waves for calibration via the signal separator; and
an operator configured to receive a measurement value output by the signal receiver receiving the measurement target waves and the reflected waves for calibration, and correct the received measurement value of the measurement target on the basis of the measurement value corresponding to the received reflected waves for calibration,
wherein the signal generator, the signal receiver, the changeover switch, the sensor, and the signal separator are formed on one circuit board as a dielectric spectrometer,
wherein, when an effective wavelength of the measurement target in the electromagnetic waves is determined in advance, a transmission length of a transmission line between the changeover switch and the calibration standard, and a transmission length of a transmission line between the changeover switch and the sensor are determined in advance according to the effective wavelength.
8 . A dielectric spectroscopy measuring method performed by a dielectric spectroscopy measuring device in which a signal generator, a signal receiver, a changeover switch, a sensor, and a signal separator are formed as a dielectric spectrometer on one circuit board, the dielectric spectroscopy measurement method comprising:
generating, by the signal generator, electromagnetic waves;
receiving, by the signal separator, the electromagnetic waves generated by the signal generator, and outputting the received electromagnetic waves to the changeover switch;
receiving, by the changeover switch, the electromagnetic waves generated by the signal generator via the signal separator, switching an output destination, and outputting the received electromagnetic waves;
outputting, by a circuit for a calibration standard, reflected waves for calibration generated by receiving the electromagnetic waves output by the changeover switch to the changeover switch;
outputting, by the changeover switch, the reflected waves for calibration returning from the output destination to the signal separator;
irradiating, by the sensor, a measurement target with the electromagnetic waves output by the changeover switch, and outputting measurement target waves obtained by the irradiation to the changeover switch;
outputting, by the changeover switch, the measurement target waves returning from the output destination to the signal separator;
outputting, by the signal separator, the measurement target waves and the reflected waves for calibration to the signal receiver;
receiving, by the signal receiver, the measurement target waves and the reflected waves for calibration; and
receiving, by an operator, a measurement value output by the signal receiver receiving the measurement target waves and the reflected waves for calibration, and correcting the received measurement value of the measurement target on the basis of the measurement value corresponding to the received reflected waves for calibration,
generating, by the signal generation unit, the electromagnetic waves from after the switching of an output destination by the changeover switch unit until before the next switching.