The ultra-weak magnetic measurement sensor has vast application potential in brain science, life sciences, deep earth/deep space/deep sea exploration, military defense, industrial testing, seismic magnetometry, and aeromagnetic exploration.
Ultra-weak magnetic measurement sensors, also known as ultra-low intensity magnetic field sensors, are a type of magnetic field sensor used to measure extremely weak magnetic fields.
Ultra-weak magnetic fields are commonly found on Earth and refer to magnetic fields with extremely low intensity that are difficult to measure or perceive, such as the biomagnetic fields emitted by organs like the heart and brain. Ultra-weak magnetic fields have critical applications in various fields, but due to their intensity often ranging from nanotesla to picotesla, achieving precise measurement is key to their application.
Methods for measuring ultra-weak magnetic fields include superconducting effect methods, magnetic resonance methods, magnetoresistance effect methods, and magneto-optical effect methods. According to the New Sijie Industry Research Center report titled “2025-2029 China Ultra-Weak Magnetic Measurement Sensor Market Monitoring and Future Development Prospects Research Report” shows that traditional magnetic measurement sensors do not meet the required precision for ultra-weak magnetic field measurement. In recent years, with the advent of the quantum era of precision measurement technology, the sensitivity and accuracy of sensors have continuously improved, thereby expanding the market space for ultra-weak magnetic measurement sensors.
Ultra-weak magnetic measurement sensors have vast application potential in brain science, life sciences, deep earth/deep space/deep sea exploration, military defense, industrial testing, seismic magnetometry, and aeromagnetic exploration. In the field of deep earth/deep space/deep sea exploration, ultra-weak magnetic measurement sensors can detect the distribution of oil and gas in the seabed and deep earth, as well as magnetic field information from deep space. In the field of brain science, ultra-weak magnetic measurement sensors can reflect brain activity by measuring tiny changes in magnetic fields, providing guidance for the treatment of cardiovascular diseases, brain tumors, epilepsy, and other conditions.
Atomic magnetometers based on the SERF effect have advantages such as non-contact, non-damage, and ultra-high sensitivity in detecting ultra-weak magnetic fields, making them a current research hotspot. Atomic magnetometers, also known as optically pumped magnetometers (OPM), are devices for detecting ultra-weak magnetic fields, with theoretical detection sensitivity reaching the fT/Hz level. The team from Beihang University initiated research on SERF atomic magnetometers in 2008, addressing national major needs. In 2020, Beihang University began applying for a large scientific facility for ultra-weak magnetic fields, jointly undertaking the cultivation, construction, operation maintenance, and technical upgrading tasks of the “Ultra-High Sensitivity Ultra-Weak Magnetic Field and Inertial Measurement Device” with the Hangzhou Institute of Major Scientific Infrastructure Research.
The Beihang University team is currently developing the third generation of ultra-weak magnetic measurement sensors. In terms of industrialization, the team has incubated a company, Guoqi (Deqing) Sensor Technology Co., Ltd., which focuses on the research and production of SERF magnetometer sensor systems, with products already applied in the zero-magnetic medical equipment industry.
Industry analysts from New Sijie indicate that quantum magnetic measurement is a key focus for financial investment in quantum precision measurement technology, with the global quantum magnetic measurement market expected to reach $1 billion by 2035. In recent years, China’s quantum magnetic measurement technology level has continuously improved, laying a foundation for the development of the ultra-weak magnetic measurement sensor industry. Ultra-weak magnetic measurement sensors have extremely high application value in resource exploration, seismic magnetometry, and medical diagnosis. As technology continues to improve and innovate, the sensitivity, measurement range, and anti-interference capabilities of ultra-weak magnetic measurement sensors will further enhance.
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