China Aerogeophysical Survey and Remote Sensing Center for Land and Resources

Beijing, China

China Aerogeophysical Survey and Remote Sensing Center for Land and Resources

Beijing, China
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Hu X.,Wuhan University | Peng R.,Wuhan University | Wu G.,Wuhan University | Wang W.,China Aerogeophysical Survey and Remote Sensing Center for Land and Resources | And 2 more authors.
Geophysics | Year: 2013

A controlled-source audio-frequency magnetotelluric (CSAMT) survey has been carried out to investigate potential iron (Fe) and polymetallic (Pb-Zn-Cu) deposits in Longmen region, which is one of the main metallogenic belts in southern China. Conducting geophysical surveys in this area is quite difficult due to mountainous terrain, dense forest, and thick vegetation cover. A total of 560 CSAMT soundings were recorded along twelve surveying lines. Two-dimensional Occam's inversion scheme was used to interpret these CSAMT data. The resulting electric resistivity models showed that three large-scale highly conductive bodies exist within the surveying area. By integrated interpretation combined with available geologic, geophysical, and geochemical data in this area, three prospective mineral deposits were demarcated. Based on the CSAMT results, a borehole penetrating approximately 250-m depth was drilled at the location of 470 m to the northwest end of line 06, defined with a massive pyrite from the depth of 52- 235 m with 7%-16% Fe content, as well as locally highgrade Pb-Zn- and Ag-Ti-bearing ores. © 2013 Society of Exploration Geophysicists.


Zeng G.-Q.,Chengdu University of Technology | Ge L.-Q.,Chengdu University of Technology | Xiong S.-Q.,China Aerogeophysical Survey and Remote Sensing Center for Land and Resources | Ni W.-C.,Airborne | And 2 more authors.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2010

Considered airborne spectrum's characteristic of low counter rate, high statistics fluctuation when measured in short time period, kalman filter algorithm was adopted to smooth the noise within the airborne spectrum. Compared the effect of several normal used smooth methods with kalman filter method, and finally decided to use this method smooth spectrum, then search the peak position to realize auto spectrum stabilization in airborne spectrum. The result is: spectrum drift less than 1 channel when resolution is 1024 channels.


Yang D.-X.,Chengdu University of Technology | Luo Y.-Y.,Chengdu University of Technology | Ge L.-Q.,Chengdu University of Technology | Mi Y.-H.,China Aerogeophysical Survey and Remote Sensing Center for Land and Resources | Chen F.-Q.,Chengdu University of Technology
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2011

It introduces the technology about the calibration and data recombination for airborne gamma-ray spectrometry. The reason of spectral drift and data process about airborne gamma-ray spectrometry is introduced. The method is proposed to solve the problem in terms of the features of the airborne gamma-ray spectrometry and the mode of the synthesis the spectrum. At first, the calibration about the spectrum is adopted by the arithmetic based on the software. The views of energy are recombined according the demand of airborne gamma-ray survey the approved experiment shows that the means of err were reduce to by this method in one place.


Luo Y.-Y.,Chengdu University of Technology | Ge L.-Q.,Chengdu University of Technology | Hua Y.-T.,Chengdu University of Technology | Mi Y.-H.,China Aerogeophysical Survey and Remote Sensing Center for Land and Resources
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2012

The current nuclear data in the measing instrument, such as high power consumption, size, not suitable for portable field. The card takes the embedded processor LPC2148 as the core of data processing. The system takes LTC1605 to carry on the A/D conversion. The hardware electric-circuit deducts the dead-time. The data acquisition card has the advantages of high degree of integration, analysis and field data processing capability and characteristicsw while the electronics unit is reliable and high-intergrated. It accords with α, β, γ and X detector, etc, so as to build a portable versatile equipment for radiation and element analyzing.


Zeng G.-Q.,Chengdu University of Technology | Ge L.-Q.,Chengdu University of Technology | Ni S.-J.,Chengdu University of Technology | Xiong S.-Q.,China Aerogeophysical Survey and Remote Sensing Center for Land and Resources
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2012

Optimized designing of power supply to meet the digital X-ray fluorimeter demand of low noises and power dissipation. Simulated the digital trapezoid filter by SIMULINK tools, got the beset M, N coefficient from the simulation result, therefore decided the time constant of differentiating circuit, and finally confirmed the optimized switching frequency about high voltage power supply. By the methods reduced the interference come from high voltage power supply. Analyzed the characteristic of digital trapezoid filter and high speed adc sampling system, so designed the optimized low voltage power supply, reduce the interference from low voltage power supply. Designed the high efficiency constant current source by DC-DC, LDO chips and current sensing chips, then improved the power efficiency of Si-pin detector cooler power. Measured results show: the ac voltage ripples of high voltage power less than 3.5 mV, power dissipation less than 70 mW, conversion efficiency of constant current source is 83%, ripple voltage less than 12 mV, in the same conditions this optimized power supply design could improve the energy resolution of spectroscopy.


Ge L.,The Provincial Key Laboratory of Applied Nuclear Technology in Geoscience | Zeng G.,The Provincial Key Laboratory of Applied Nuclear Technology in Geoscience | Lai W.,The Provincial Key Laboratory of Applied Nuclear Technology in Geoscience | Fan Z.,China Aerogeophysical Survey and Remote Sensing Center for Land and Resources | And 2 more authors.
He Jishu/Nuclear Techniques | Year: 2011

In this paper, we report a newly developed AGS instrument. The probe is composed of five 5 NaI(Tl) scintillators of 10 mm × 10 mm × 40 mm size. Four of them detect the ground, and the fifth detects the sky. A temperature sensor, a preamplifier with circuit negative feedback and a high voltage supply with lower noise are designed. A Y/U double channel digital controlled gain amplifier for fine adjustment of the spectral drift, and high speed ADC and CPLD, are designed to perform digital spectroscopy and improve the energy resolution and pulse through output rate (> 100 k/s). Two self-stabilization spectrum loops are designed for spectrum stability. The first loop performs rough adjustment (temperature), and the second loop does the fine adjustment by a Kalman filter. The AGS system has the following specifications: energy range of detection, 0.02-10.0 MeV; the spectral drift, ± 1 channel; and spectrum collection time of 0.5-1 s. The 20 NaI(Tl) + PMT scintillation counters can be operated at the same time.

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