公开(公告)号：US5027655A

公开(公告)日：1991-07-02

申请号：US416304

申请日：1989-10-03

Applicant: Christopher R. Sweet

Inventor： Christopher R. Sweet

IPC: E21B47/04 ,  G01F23/28 ,  G01F23/296

CPC classification number: G01F23/2966 ,  E21B47/042 ,  G01F23/28

Abstract: A method of detecting water level in an elongate cavity comprises emitting an alternating signal into the cavity, varying the frequency of said signal to provide a specific response from the cavity, detecting said response, and comparing said outgoing signal and response. In a preferred embodiment the response is a returning signal reflected from the surface of the water. The frequency of the outgoing signal may be varied continuously to establish a substantially steady state difference frequency between the outgoing and returning signal.

Abstract translation: 检测细长腔中的水位的方法包括将交变信号发射到空腔中，改变所述信号的频率以提供来自腔的特定响应，检测所述响应以及比较所述输出信号和响应。 在优选实施例中，响应是从水面反射的返回信号。 输出信号的频率可以连续变化以在输出和返回信号之间建立基本稳定的状态差频率。

公开(公告)号：US5488227A

公开(公告)日：1996-01-30

申请号：US320674

申请日：1994-10-11

Applicant: Christopher R. Sweet

Inventor： Christopher R. Sweet

IPC: G01N21/03 ,  G01N21/61

CPC classification number: G01N21/031 ,  G01N2201/0668

Abstract: A gas analyser and detector has an infra red source, a gas chamber and a detector cell; the detector cell has a gas sample inlet, inlet and exit paths for an infra red beam and reflector means in the chamber comprising a convex surface and a concave surface. The reflector means ensures a long path length for the beam whilst reducing beam divergence and signal loss.

Abstract translation: 气体分析仪和检测器具有红外源，气室和检测器单元; 检测器单元具有气体样品入口，用于红外线的入口和出口路径以及腔室中的反射器装置，包括凸面和凹面。 反射器装置确保了光束的长路径长度，同时减少了光束发散和信号损失。