36 results about "Proton magnetometer" patented technology

The invention relates to the technical field of magnetic field measurement, in particular to a magnetometer capable of absolutely measuring a weak magnetic field. The magnetometer comprises a high-frequency oscillator (1), a probe (2), a DC pulse generator (3), an amplifier (4), a frequency meter (5) and a numerical control unit (6); the numerical control unit (6) controls all parts to work in a coordinative way to form the high-precision OVERHAUSER proton magnetometer; and an external magnetic filed is measured through the mutual action of double resonance systems, i.e. resonance of unpaired electrons of free radical in free radical solution in the probe in a high-frequency magnetic field and resonance of protons in the free radical solution in the external magnetic field. The OVERHAUSER magnetometer has the advantages of high precision, high sensitivity, low power consumption, absolute measurement to the external magnetic field and the like.

The invention discloses a blasting displacement measuring method and a magnetic target device for measurement. A magnetic target device electrified intermittently is put in an auxiliary hole. After the magnetic target device is electrified, the magnetic target device will generate a local magnetic field at the placement position to disturb the geomagnetic field value at the placement position of amagnetic target, and an interference field will be formed around the magnetic target. The magnetic field intensity of the current area before and after the placement of the magnetic target is obtained by a high-precision proton magnetometer, and data export and diurnal variation correction are carried out by the preprocessing software of the proton magnetometer. A diurnal variation station is setin the magnetic field area to carry out diurnal variation correction on the magnetic field intensity data of a blasting area, the corrected magnetic field intensity data of the blasting site before and after blasting is obtained, the magnetic anomaly of the blasting area is calculated, and a magnetic anomaly magnetic field intensity contour map is drawn. A large number of closed magnetic field intensity contour lines appear in the magnetic anomaly magnetic field intensity contour map, and the position of the magnetic target is thus determined. The positions of the magnetic target before and after blasting are located, and the blasting displacement is measured and calculated according to the positions of the magnetic target before and after blasting.

The invention provides a method and a circuit for improving the measurement precision of a proton magnetometer; the method adopts 1) a high-speed device cycle-measuring method which uses the period of the signal to be measured as the counting gate time of the standard pulse so as to calculate the period of the signal to be measured; 2) an evaluation and processing method for grade of real-time signal data, which automatically calculates the discreteness according to the difference of the magnetic field to be measured and the interference on the time domain characteristic and the attenuation characteristic of the spinning signal; and 3) a correction method for the temperature coefficient of devices, which adopts high-sensitiveness temperature integration sensor and an A / D (analog to digital) converter to directly carry out the correction in the measurement program. The circuit comprises an omni-directivity deep-sea proton magnetic probe, a probe polarization converter, a polarization controller, a tuning matcher, a frequency selective amplifier, a signal shaper, a signal counter, a counting gate, a standard pulse generator and a binary counter.

The invention discloses a multi-parameter measuring proton magnetometer. The multi-parameter measuring proton magnetometer comprises a magnetometer body and a probe. A panel of the magnetometer is sequentially provided with a key region, a display screen and a GPS plug used for being connected with a GPS probe; a microcomputer board, a shielding board, an amplifying board and a battery are sequentially arranged in the magnetometer body from top to bottom; a battery plug, a USB plug and a serial port plug are sequentially arranged on the lateral side of the magnetometer body, wherein the battery plug and the USB plug are respectively connected with the microcomputer board, and the serial port plug is connected with the amplifying board; the probe comprises a probe rod, a proton probe and a fluxgate probe, wherein the proton probe is fixed to the probe rod and is used for measuring the total field of the ground, the fluxgate probe is used for measuring a three-component magnetic field, magnetic declinations and magnetic inclinations, and the proton probe and the fluxgate probe are respectively connected with the microcomputer board of the magnetometer body. The multi-parameter measuring proton magnetometer can measure a plurality of parameters in one measuring point position, namely, the total field of the ground is measured, besides, the three-component magnetic field, the magnetic declinations and the magnetic inclinations can be measured.

The invention provides a method and a circuit for improving the measurement precision of a proton magnetometer; the method adopts 1) a high-speed device cycle-measuring method which uses the period of the signal to be measured as the counting gate time of the standard pulse so as to calculate the period of the signal to be measured; 2) an evaluation and processing method for grade of real-time signal data, which automatically calculates the discreteness according to the difference of the magnetic field to be measured and the interference on the time domain characteristic and the attenuation characteristic of the spinning signal; and 3) a correction method for the temperature coefficient of devices, which adopts high-sensitiveness temperature integration sensor and an A / D (analog to digital) converter to directly carry out the correction in the measurement program. The circuit comprises an omni-directivity deep-sea proton magnetic probe, a probe polarization converter, a polarization controller, a tuning matcher, a frequency selective amplifier, a signal shaper, a signal counter, a counting gate, a standard pulse generator and a binary counter.

A method for measuring a triaxial magnetic field coil quadrature angle is disclosed. A magnetic field with a certain size is generated in a triaxial magnetic field coil. A value of a magnetic induction intensity amount can be read through equipment which is used to measure the magnetic induction intensity amount. And then an included angle between the coils can be calculated through a formula. The equipment of measuring the magnetic induction intensity amount is an optical pump or a proton magnetometer. By using the method provided in the invention, equipment movement and installation operation are not needed during measuring the quadrature angle of the triaxial coil; a horizontal state is not needed to be aligned and be searches; machinery assembling operation is not needed so that an installation error can be avoided. The method possesses advantages of high precision measurement, simple operation and the method is easy and convenient to be used. If the method is used to measure the quadrature angle of the magnetic field coil of a certain apparatus, the actual measured angle is 89.82 DEG and precision can reach 0.01DEG which is an order of magnitude higher than the precision (generally 0.1 DEG) reached by using a common detection method.

The invention relates to the field of magnetic measurement and, more particularly, to an error calibration method for a geomagnetic vector measurement system based on a Lagrange multiplier method. The error calibration method comprises the steps of (S1) selecting a calibration area, setting a non-magnetic platform at the center of the area, and measuring the total amount of the geomagnetic field above the non-magnetic platform with a proton magnetometer; (S2) encapsulating a geomagnetic vector measurement system in a non-magnetic L-face box, and placing the box on a non-magnetic surface; (S3) turning over and placing the non-magnetic L-faced box on the non-magnetic platform successively with each side as a bottom surface, when each face is used as the bottom surface, rotating the L-faced box around the vertical axis of the non-magnetic platform under uniform angle differences for R attitudes, and recording output values of a three-axis magnetic sensor and an inertial navigation system at each attitude; and (S4) establishing a linear system of equations with the total amount of the geomagnetic field as a constraint for joint solution to obtain comprehensive error model parameters and further obtaining a geomagnetic vector value under a geometrical coordinate system and a magnetic sensor coordinate system after calibration.

The invention belongs to the technical field of drilling position detection, and discloses a method for identifying a drilling remaining sleeve based on high-precision magnetic method measurement. Themethod comprises the following steps of determining the previous excavation condition and the excavation position in a large range; determining the specific position of the drilling through daily change measurement and movement measurement; performing modeling analysis on the sleeve, and analyzing the relationship between the ground magnetic induction intensity and the model volume; performing actual measurement analysis; and performing analysis in combination with different actual conditions, and further determining the existence position of the magnetic body. According to the method, two high-precision proton magnetic instruments are used for measurement; the position of the drilling remaining sleeve is determined in a large range for measurement; the range is narrowed, meanwhile, afterthe range is further narrowed, a model is manufactured, simulation measurement is conducted, field measurement is conducted after simulation is completed, the drilling remaining sleeve is rapidly found out by determining the induction relation between the magnetic induction intensity and the magnetic body buried in the ground, the searching efficiency is high, and the precision is high.

The invention discloses a method for optimization selection of a proton magnetometer matching capacitor, and belongs to the technical field of magnetic field intensity detection. The method for optimization selection of the matching capacitor comprises the processes of determining matching circuit system parameters, determining the fixed minimum capacitance Cmin and gradually determining the matching capacitor. The method for optimization selection of the matching capacitor according to the matching circuit bandwidth is provided under the condition that certain frequency points are not located within the bandwidth of a matching circuit due to limited capacitor combination and matching, and the whole matching circuit bandwidth can cover the whole system bandwidth. Meanwhile, the matching method for the circuit with capacitance errors is obtained through analysis under the condition that the errors exist between actual capacitance and ideal capacitance, and the problem that due to matching frequency emission offset caused by the capacitor capacitance value errors, certain frequency points are not within the circuit bandwidth range is solved. According to the method, the matching capacitor can be selected according to different measuring ranges, and the precision of later measuring signals is improved.

When the vector proton magnetometer measures different components of the geomagnetic field, the signal strength will be different, and at the same time, the frequency selection circuit will have temperature drift changes, which will affect the measurement accuracy of the instrument. To solve these problems, the present invention has invented an automatic adjustment The method of intelligent frequency selection of the vector proton magnetometer based on the amplification factor of the signal amplification circuit and the frequency selection characteristics of the frequency selection circuit. This method first selects and amplifies the signal according to the frequency selection parameters and amplification factors set by the instrument, and then measures the signal. According to the strength of the signal, adjust the magnification of the frequency selection circuit to make the signal strength in a more suitable strength range, and fine-tune the frequency selection capacitance of the frequency selection circuit to make the next frequency selection signal close to the strongest and achieve accurate selection. frequency and amplification purposes. The realization circuit of the present invention is composed of four parts: a frequency selection circuit, a signal amplification circuit, a signal filter circuit, a signal strength detection circuit and a single-chip microcomputer control circuit.

The invention discloses a blasting displacement measuring method and a magnetic target device for measurement. A magnetic target device electrified intermittently is put in an auxiliary hole. After the magnetic target device is electrified, the magnetic target device will generate a local magnetic field at the placement position to disturb the geomagnetic field value at the placement position of amagnetic target, and an interference field will be formed around the magnetic target. The magnetic field intensity of the current area before and after the placement of the magnetic target is obtained by a high-precision proton magnetometer, and data export and diurnal variation correction are carried out by the preprocessing software of the proton magnetometer. A diurnal variation station is setin the magnetic field area to carry out diurnal variation correction on the magnetic field intensity data of a blasting area, the corrected magnetic field intensity data of the blasting site before and after blasting is obtained, the magnetic anomaly of the blasting area is calculated, and a magnetic anomaly magnetic field intensity contour map is drawn. A large number of closed magnetic field intensity contour lines appear in the magnetic anomaly magnetic field intensity contour map, and the position of the magnetic target is thus determined. The positions of the magnetic target before and after blasting are located, and the blasting displacement is measured and calculated according to the positions of the magnetic target before and after blasting.