Total field pumping source device suitable for underground long-term stable work and working method

Abstract

The invention provides a total field pumping source device suitable for underground long-term stable work and a working method. The total field pumping source device comprises an excitation circuit module A, a dumbbell-shaped helium lamp, a detection circuit, a first temperature sensor, a second temperature sensor, a microcontroller B, a feedback adjusting module C and an excitation circuit power-off module. An optical signal emitted by the dumbbell-shaped helium lamp is converted into a current signal after passing through the photoelectric detector, and common-mode interference of the circuit can be reduced by adopting the differential current-to-voltage module, so that the stability of the output light intensity of the helium lamp is improved; by collecting the temperature of the power tube in real time, the risk of circuit damage during long-term working in an underground closed space can be avoided by a mode of turning off a circuit when the monitored temperature is higher than the working temperature of a chip, and the service life of a total field instrument is prolonged; meanwhile, the stability of the output light intensity of the pump light source is improved by adopting a closed-loop feedback control mode of the pump light source according to the measured temperature.

Description

technical field [0001] The invention relates to the field of underground general field pump source devices, in particular to a general field pump source device and a working method suitable for long-term stable underground operation. Background technique [0002] The distribution and change of the geomagnetic field have strong regularity. During the earthquake incubation process, the physical properties of the underground medium in the formation area will change, and the geomagnetic field will appear abnormal before the earthquake. Downhole observation can avoid climate change and artificial The near-surface disturbance caused by the activity is conducive to obtaining high-quality observation data. Therefore, the long-term stable monitoring of the geomagnetic field is of great significance for the monitoring and early warning of earthquake natural disasters. [0003] The helium optical pump magnetometer is a high-sensitivity total field magnetic anomaly detection device, and...

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Problems solved by technology

[0003] The helium optical pump magnetometer is a high-sensitivity total field magnetic anomaly detection device, and the pump light source is the core component of the magnetic measuring instrument. It is an important prerequisite for the realization of the magnetic measurement from the ground state to the metastable state of the atoms in it. The excitation field will "light up" the pump lamp, and the instability of the pump light intensity will affect the long-term stability of the magnetic measurement, which directly determines the performance of the total field magnetic measurement. The long-term application of

The application of the pump light intensity in the downhole is mainly affected by the following aspects. First, the pressure of the gas chamber in the pump lamp is affected by the high temperature in the well, which leads to the change of the light intensity. Secondly, the high-power excitation field is amplified by the power tube, and the power tube Severe heat generation, however

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