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Method and apparatus for obtaining high resolution subsurface geophysical measurements
Method and apparatus for obtaining high resolution subsurface geophysical measurements
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机译:获得高分辨率地下地球物理测量结果的方法和设备
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摘要
A subsurface geophysical parameter measurement is converted downhole to a first pulse train whose instantaneous frequency is a function of the parameter value. In response to a first control signal, a first counter begins a first count of pulses from the first pulse train, and a second counter begins a count of second pulses from a downhole reference oscillator. The first and second counts are terminated in response to a second control signal and the first and second counters are interrogated. A ratio is then developed between the first and second counts which is functionally related to the value of the parameter.
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