公开(公告)号：US3745346A

公开(公告)日：1973-07-10

申请号：US3745346D

申请日：1971-06-01

Applicant: DRESSER IND

Inventor： CULVER R

IPC: G01V5/10 ,  G01T3/00

CPC classification number: G01V5/108

Abstract: The amplified pulses from a radioactivity detector are coupled to a discriminator and via a 400 nanosecond delay line to the inputs of three charge and hold circuits. The discriminator drives a first modulo 3 scaler-decoder and also a single shot multivibrator. The single shot output and the decoder outputs are AND gated with a sense amplifier sensing the charge and hold capacitor to control the charge and hold circuits. A second modulo 3 scaler-decoder circuit driven by a clock provides the gating of three interrogator circuits connected to the outputs of the three charge and hold circuits, respectively. The circuit converts the random pulse train from the radioactivity detector to that of a train of pulses of a fixed frequency.

公开(公告)号：US3752988A

公开(公告)日：1973-08-14

申请号：US3752988D

申请日：1971-06-01

Applicant: DRESSER IND

Inventor： CULVER R

IPC: G01V5/10 ,  H01J39/30

CPC classification number: G01V5/102

Abstract: The amplified pulses from a radioactivity detector are coupled to a discriminator and via a 400 nanosecond delay line to the inputs of three linear gates. The discriminator is AND gated with a clock pulse and a J-K flip-flop. A scale of four and a 1 of 4 decoder and a single shot multivibrator are driven by the AND gate output. The single shot output and the decoder outputs are AND gated to control the linear gates. In an alternative embodiment, the linear gates and delay lines are replaced with charge and hold, delay and interrogate circuits.

Abstract translation: 来自放射性检测器的放大脉冲被耦合到鉴别器，并通过400纳秒延迟线耦合到三个线性门的输入。 鉴频器与门控时钟脉冲和J-K触发器。 4位解码器和1位4位解码器和单次多谐振荡器的比例由AND门输出驱动。 单次输出和解码器输出为AND门控以控制线性门。

公开(公告)号：US3739172A

公开(公告)日：1973-06-12

申请号：US3739172D

申请日：1971-05-24

Applicant: DRESSER IND

Inventor： CULVER R

IPC: G01V5/10 ,  G01T1/16

CPC classification number: G01V5/102

Abstract: The amplified pulses from a radioactivity detector are coupled through a delay line to a linear gate. The amplified pulses from the detector are also connected to a discriminator. The output of the discriminator is AND gated in a logical gate with a clock pulse which is synchronized with a high energy neutron source. The AND gate triggers a single shot multivibrator which in turn triggers the linear gate. The delay line allows for the time required for the detector pulse to rise to the discriminator threshold and for the propagation delay in the logic circuitry. The linear gate opens before the arrival of the detector pulse and closes after it passes through. In this embodiment, any detector pulse having the necessary discriminator level occuring within the clock pulse interval passes through the linear gate as a full width pulse. In an alternative embodiment, a J-K flip-flop circuit is triggered by the trailing edge of the single shot multivibrator to disable the AND gate, thus causing the linear gate to pass only the first detected pulse having the necessary discriminator level.

公开(公告)号：US3787686A

公开(公告)日：1974-01-22

申请号：US3787686D

申请日：1971-05-24

Applicant: DRESSER IND

Inventor： CULVER R

IPC: G01V5/10 ,  G01V5/14 ,  G01V5/00

CPC classification number: G01V5/101 ,  G01V5/102 ,  G01V5/14 ,  G01V5/145

Abstract: A fast neutron source is periodically switched between a pulsed mode and a continuous mode. A first gamma ray detection interval follows the pulsed mode to provide an indication of the capture gamma rays. A second detection interval occurs during the continuous mode to provide an indication of the capture gamma rays plus the gamma rays resulting from the inelastic scattering of fast neutrons. The first indication is subtracted from the second, resulting in an indication solely of the gamma rays from inelastic scattering. The pulses occurring in such intervals are further subjected to energy discrimination which provides information relating to carbon and oxygen content, such information being used with a ratio circuit to provide a carbon/oxygen ratio. In another embodiment, a pair of neutron sources, one pulsed, one continuous, provide analogous results. In still another embodiment, the borehole is first logged with a pulsed source and then later with a continuous source. In yet another embodiment, a shielding, rotating disk having alternate short and long windows is used between an alpha particle source and a neutron emitter to simulate the pulsed and continuous modes.

Abstract translation: 快中子源在脉冲模式和连续模式之间周期性切换。 第一伽马射线检测间隔跟随脉冲模式以提供捕获伽马射线的指示。 在连续模式期间发生第二检测间隔，以提供捕获伽马射线加上由快中子的非弹性散射产生的伽马射线的指示。 从第二个数据中减去第一个指示，从而仅显示来自非弹性散射的伽马射线。 在这种间隔中发生的脉冲进一步受到能量鉴别，其提供了与碳和氧含量相关的信息，该信息与比率电路一起使用以提供碳/氧比。 在另一个实施例中，一对中子源，一个脉冲的，一个连续的，提供类似的结果。 在另一个实施例中，首先用脉冲源记录钻孔，然后用连续的源记录钻孔。 在另一个实施例中，在α粒子源和中子发射器之间使用具有交替的短和长窗口的屏蔽旋转盘，以模拟脉冲和连续模式。