Nuclear magnetic resonance sensing device and nuclear magnetic resonance sensing method

A nuclear magnetic resonance sensing device comprising:

• a nuclear magnetic resonance sensing part that applies a high frequency magnetic field based on an RF signal to a target object and generates an observation signal with a frequency that is shifted from a frequency of the RF signal by a frequency of a nuclear magnetic resonance signal;
• a mixer part that performs intermediate frequency demodulation of the observation signal and generates an intermediate frequency demodulation signal including the nuclear magnetic resonance signal;
• a low-pass filter that attenuates a high frequency component higher than an intermediate frequency of the intermediate frequency demodulation of the intermediate frequency demodulation signal and passes a frequency component of the nuclear magnetic resonance signal;
• and
• a digitizing device that digitizes the intermediate frequency demodulation signal that has passed through the low-pass filter,
• wherein the digitizing device includes:
• a physical field generator that generates a magnetic field or an electric field corresponding to the intermediate frequency demodulation signal that has passed through the low-pass filter;
• an optical quantum sensor part that generates light corresponding to the magnetic field or the electric field by a sensing member and converts the light into an electrical signal as a sensor signal by a photoelectric element;
• and
• an analog/digital converter that digitizes the sensor signal,
• the optical quantum sensor part performs a quantum operation with respect to the sensing member and causes the sensing member to generate the light corresponding to the magnetic field or the electric field,
• the mixer part is configured with a double balanced mixer or a triple balanced mixer,
• the double balanced mixer or the triple balanced mixer includes a plurality of phase distributors and a diode bridge, and
• a turn ratio of the phase distributor is set so that an output impedance of the double balanced mixer or a characteristic impedance of a primary side of an output side transformer of the triple balanced mixer exceeds a characteristic impedance of a cable connected to an input terminal of the double balanced mixer or the triple balanced mixer.

A nuclear magnetic resonance sensing device comprising:

• a nuclear magnetic resonance sensing part that applies a high frequency magnetic field based on an RF signal to a target object and generates an observation signal with a frequency that is shifted from a frequency of the RF signal by a frequency of a nuclear magnetic resonance signal;
• a mixer part that performs intermediate frequency demodulation of the observation signal and generates an intermediate frequency demodulation signal including the nuclear magnetic resonance signal;
• a low-pass filter that attenuates a high frequency component higher than an intermediate frequency of the intermediate frequency demodulation of the intermediate frequency demodulation signal and passes a frequency component of the nuclear magnetic resonance signal;
• and
• a digitizing device that digitizes the intermediate frequency demodulation signal that has passed through the low-pass filter,
• wherein the digitizing device includes:
• a physical field generator that generates a magnetic field or an electric field corresponding to the intermediate frequency demodulation signal that has passed through the low-pass filter;
• an optical quantum sensor part that generates light corresponding to the magnetic field or the electric field by a sensing member and converts the light into an electrical signal as a sensor signal by a photoelectric element;
• and
• an analog/digital converter that digitizes the sensor signal,
• the optical quantum sensor part performs a quantum operation with respect to the sensing member and causes the sensing member to generate the light corresponding to the magnetic field or the electric field,
• the mixer part is configured with a double balanced mixer or a triple balanced mixer,
• the double balanced mixer or the triple balanced mixer includes a plurality of phase distributors and a diode bridge, and
• a resistance value from the nuclear magnetic resonance sensing part to the mixer part is equal to or less than an equivalent series resistance value of a diode in the diode bridge.

A nuclear magnetic resonance sensing device comprising:

• a nuclear magnetic resonance sensing part that applies a high frequency magnetic field based on an RF signal to a target object and generates an observation signal with a frequency that is shifted from a frequency of the RF signal by a frequency of a nuclear magnetic resonance signal;
• a mixer part that performs intermediate frequency demodulation of the observation signal and generates an intermediate frequency demodulation signal including the nuclear magnetic resonance signal;
• a low-pass filter that attenuates a high frequency component higher than an intermediate frequency of the intermediate frequency demodulation of the intermediate frequency demodulation signal and passes a frequency component of the nuclear magnetic resonance signal;
• and
• a digitizing device that digitizes the intermediate frequency demodulation signal that has passed through the low-pass filter,
• wherein the digitizing device includes:
• a physical field generator that generates a magnetic field or an electric field corresponding to the intermediate frequency demodulation signal that has passed through the low-pass filter;
• an optical quantum sensor part that generates light corresponding to the magnetic field or the electric field by a sensing member and converts the light into an electrical signal as a sensor signal by a photoelectric element;
• and
• an analog/digital converter that digitizes the sensor signal,
• the optical quantum sensor part performs a quantum operation with respect to the sensing member and causes the sensing member to generate the light corresponding to the magnetic field or the electric field,
• the mixer part is configured with a double balanced mixer or a triple balanced mixer,
• the double balanced mixer or the triple balanced mixer includes a plurality of phase distributors and a diode bridge, and
• a resistance value from the mixer part to the digitizing device is equal to or less than an equivalent series resistance value of a diode in the diode bridge.

A nuclear magnetic resonance sensing device comprising:

• a nuclear magnetic resonance sensing part that applies a high frequency magnetic field based on an RF signal to a target object and generates an observation signal with a frequency that is shifted from a frequency of the RF signal by a frequency of a nuclear magnetic resonance signal;
• a mixer part that performs intermediate frequency demodulation of the observation signal and generates an intermediate frequency demodulation signal including the nuclear magnetic resonance signal;
• a low-pass filter that attenuates a high frequency component higher than an intermediate frequency of the intermediate frequency demodulation of the intermediate frequency demodulation signal and passes a frequency component of the nuclear magnetic resonance signal;
• a digitizing device that digitizes the intermediate frequency demodulation signal that has passed through the low-pass filter;
• and
• a control device,
• wherein the digitizing device includes:
• a physical field generator that generates a magnetic field or an electric field corresponding to the intermediate frequency demodulation signal that has passed through the low-pass filter;
• an optical quantum sensor part that generates light corresponding to the magnetic field or the electric field by a sensing member and converts the light into an electrical signal as a sensor signal by a photoelectric element;
• and
• an analog/digital converter that digitizes the sensor signal,
• the optical quantum sensor part repeatedly and periodically executes predetermined measurement sequences, and performs a quantum operation with respect to the sensing member in each measurement sequence to cause the sensing member to generate the light corresponding to the magnetic field or the electric field, and
• the control device alternatively switches a phase between two phases perpendicular to each other for each of the measurement sequences and causes the mixer part to generate the intermediate frequency demodulation signal with the two phases.

A nuclear magnetic resonance sensing method comprising:

• a step of applying a high frequency magnetic field based on an RF signal to a target object and generating an observation signal with a frequency that is shifted from a frequency of the RF signal by a frequency of a nuclear magnetic resonance signal;
• a step of performing, by a mixer part, intermediate frequency demodulation of the observation signal and generating an intermediate frequency demodulation signal including the nuclear magnetic resonance signal;
• a step of attenuating, by a low-pass filter, a high frequency component higher than an intermediate frequency of the intermediate frequency demodulation of the intermediate frequency demodulation signal and passing a frequency component of the nuclear magnetic resonance signal;
• and
• a digitizing step of digitizing, by a digitizing device, the intermediate frequency demodulation signal that has passed through the low-pass filter,
• wherein the digitizing step includes:
• (a) generating a magnetic field or an electric field corresponding to the intermediate frequency demodulation signal that has passed through the low-pass filter;
• (b) generating light corresponding to the magnetic field or the electric field by a sensing member;
• (c) converting the light into an electrical signal as a sensor signal by a photoelectric element;
• and
• (d) digitizing the sensor signal by an analog/digital converter, and
• in the digitizing step, predetermined measurement sequences are repeatedly and periodically executed, and a quantum operation is performed with respect to the sensing member in each measurement sequence to cause the sensing member to generate the light corresponding to the magnetic field or the electric field, and
• a phase is alternatively switched between two phases perpendicular to each other for each of the measurement sequences to cause the mixer part to generate the intermediate frequency demodulation signal with the two phases.