公开(公告)号：US20230160937A1

公开(公告)日：2023-05-25

申请号：US17693793

申请日：2022-03-14

申请人： North University of China

发明人： Jun LIU ,  Zongmin MA ,  Jun TANG ,  Yunbo SHI ,  Hao GUO ,  Zhonghao LI ,  Xiaocheng WANG ,  Junzhi ZHAO ,  Doudou ZHENG ,  Qimeng WANG

IPC分类号： G01R29/08

CPC分类号： G01R29/0885 ,  G01R29/0871

摘要： A frequency measurement system and method of a radio frequency (RF) signal. The frequency measurement system includes: a magnetic field source module, a light source module, an excitation module, a complementary metal-oxide-semiconductor (CMOS) camera, and a signal processing module; the excitation module is disposed in the magnetic field; the excitation module is disposed on an output light path of the light source module; the CMOS camera is disposed on an output light path of the excitation module; and the CMOS camera is connected to the signal processing module; the light source module is configured to emit a laser; the CMOS camera is configured to capture an excitation image when the laser enters the excitation module to which a to-be-tested RF signal is applied; and the signal processing module is configured to determine a frequency of the to-be-tested RF signal according to the excitation image.

公开(公告)号：US20220196700A1

公开(公告)日：2022-06-23

申请号：US17546532

申请日：2021-12-09

申请人： North University of China

发明人： Zongmin MA ,  Jun LIU ,  Jun TANG ,  Yunbo SHI ,  Xiaoming ZHANG ,  Hao GUO ,  Huanfei WEN ,  Cheng DONG ,  Jiuyan WEI

IPC分类号： G01Q60/24 ,  G01N21/01 ,  G01N21/84

摘要： A system for simultaneously and microscopically measuring vapor cell coating film energy transfer and relaxation characteristics at nanometer scales includes a space relaxation characteristic detection unit which includes a laser, an optical isolator, a spatial light filter, a reflector, a Glan-Taylor polarizer, a first quarter-wave plate, a spatial light modulator, a focusing lens, a second quarter-wave plate, a polarizing film, a PD detection unit, an I/V amplification unit, a data acquisition unit, a spectroscope and an optical chopper, an atomic force microscope detection unit for energy transfer micro-areas, a shielding cylinder, a coated alkali metal atomic vapor cell, a data processing unit and a magnetic field controlled coil. The energy transfer micro-area detection unit includes coated samples, a probe, an oscillator, a laser, a four-quadrant photoelectric detection unit, a band-pass filter unit, an automatic gain controller, an adder, a piezoelectric scanning cylinder, a sample table and a PI controller.

公开(公告)号：US20210378569A1

公开(公告)日：2021-12-09

申请号：US17327671

申请日：2021-05-22

申请人： North University of China

发明人： Zongmin MA ,  Jun LIU ,  Li QIN ,  Xiaoming ZHANG ,  Doudou ZHENG ,  Yunbo SHI ,  Jun TANG ,  Hao GUO ,  Xiaocheng WANG

IPC分类号： A61B5/243 ,  G01N21/64 ,  A61B5/00

摘要： The present disclosure provides a cuboid magnetometer with high fluorescence collection efficiency, used for cardiac magnetic field measurement, and based on nitrogen-vacancy (NV) centers in diamond, and a cardiac magnetic field measurement system. The cardiac magnetic field measurement system includes a magnetic shielding chamber, a non-magnetic bed, an array probe for cardiac magnetic field measurement, a three-axis displacement platform, a high-speed data collection card, a fiber laser source, a microwave source, and a computer. The array probe for cardiac magnetic field measurement includes a non-magnetic shell, a stepping motor, a porous rotary fiber coupling apparatus, a fiber bundle set, a special photodetector (PD) set, a filter set, a ring-shaped antenna, and special diamond.