公开(公告)号：EP0807261A2

公开(公告)日：1997-11-19

申请号：EP96901882.0

申请日：1996-02-01

申请人： Croma Developments Limited

发明人： FELL, Roger

IPC分类号： G01F23 ,  G01S7 ,  G01S15

CPC分类号： G01S7/5273 ,  G01F23/2962 ,  G01S7/52006 ,  G01S7/521 ,  G01S7/524 ,  G01S7/526 ,  G01S7/527 ,  G01S15/101 ,  G01S15/88 ,  Y10S367/908

摘要： The invention concerns pulse echo distance measurement and in particular a method and apparatus for calculating such a distance by sensing multiple reflections of a given pulse signal. By sensing multiple reflections, and not just the primary echo, internal time delays which would otherwise cause systematic errors may be simply eliminated and the multiple readings obtained may be utilised to provide system self-diagnostic checks, eliminate spurious information and provide an accurate measure of distance. A particular advantage of the method is that very small distances between sensor and target may be measured.

公开(公告)号：EP0797105A2

公开(公告)日：1997-09-24

申请号：EP97104518.2

申请日：1997-03-17

申请人： SIEMENS AKTIENGESELLSCHAFT

发明人： Kroemer, Nils ,  Freund, Arthur

IPC分类号： G01S15/10

CPC分类号： G01S7/5273 ,  G01F1/667 ,  G01S13/10 ,  G01S15/10

摘要： Ein Signal, das den Empfänger als über mehrere Schwingungen ansteigende und wieder abfallende Wellengruppe erreicht, wird während eines Meßfensters abgetastet, digitalisiert, abgespeichert und mit einem Referenzsignal, das vorzugsweise einem bei ungestörter Übertragung abgespeicherten Empfangssignal entspricht, korreliert. In Abhängigkeit von der Lage des Meßfensters und der Lage des Maximums der Einhüllenden der Kreuzkorrelationsfunktion wird ein Nulldurchgang der Wellengruppe selektiert und der Schnittpunkt einer interpolierenden Funktion mit Bezugspotential ermittelt. In einem ersten Schritt wird zur ungefähren Ermittlung der zeitlichen Lage der Wellengruppe ein größeres Meßfenster und eine geringere Abtastrate, in einem zweiten Schritt zur Nulldurchgangsselektion und genauen Detektion ein kleineres Meßfenster mit höherer Abtastrate gewählt.
Die Erfindung wird angewandt bei Ultraschall-Durchflußmessern.

摘要翻译： 信号以振荡的方式上升和下降的几个波群的形式到达接收机。 信号在测量窗口采样，数字化并存储。 然后将信号与对应于在无噪声传输期间存储的接收机信号相对应的参考信号相关。 根据测量窗口的位置和最大值的位置来选择波群的零交叉。 的互相关函数。 确定内插函数的截止点。

公开(公告)号：EP0566705B1

公开(公告)日：1996-05-08

申请号：EP92919293.8

申请日：1992-09-17

申请人： British Nuclear Fuels PLC ,  UNIVERSITY COLLEGE CARDIFF CONSULTANTS LTD.

发明人： BULL, David, Roger ,  Thomas, Seimon, Marc

IPC分类号： G01S7/52 ,  G01S15/89

CPC分类号： G01S15/931 ,  G01S7/52004 ,  G01S7/5273

摘要： An ultrasonic ranging device suitable for use as a sensor on a mobile robot, the device comprising a transmitter (9) for transmitting in a scanned fashion a beam of ultrasonic energy over a target region of interest (11), a detector (13, 14) for detecting return ultrasonic energy comprising reflections of the transmitted beam from the target region and a signal processor (17, 19) for enhancing the signal detected by the detector, which processor comprises a correlator (19) for correlating the signal output from the detector with a reference signal wherein the reference signal is a representation of the actual signal which has been produced by that detector when the transmitted beam has reflected at normal incidence from a plane reference target surface of interest, the processor also including a computer store (21) for storing said signal representation and applying the same as a reference signal to said correlator (19) during detection of a signal representing reflection from a target to be detected.

公开(公告)号：EP0699307A1

公开(公告)日：1996-03-06

申请号：EP94917580.0

申请日：1994-05-06

申请人： NUKEM GmbH

发明人： KOCH, Roman ,  KREUTTER, Thomas

IPC分类号： A61B8 ,  G01N29 ,  G01S7 ,  G01S15

CPC分类号： G01N29/4472 ,  G01N29/11 ,  G01N29/22 ,  G01N29/449 ,  G01N29/48 ,  G01N2291/015 ,  G01S7/5273 ,  G01S15/10

摘要： The invention concerns a method and device for non-destructive testing. Ultrasonic pulses are fed into the object under test. Ultrasonic waves emerging from the object are detected by an ultrasonic test head (12), converted into electrical signal and amplified. The signals are then sampled to produce measurement values, which are digitized and stored. From the digitized sampled values of the signals a function is obtained by interpolation, by means of which the peak values of the ultrasonic waves and/or the time of propagation of the wave at the peak is determined.

公开(公告)号：EP0340953A3

公开(公告)日：1989-11-23

申请号：EP89304060.0

申请日：1989-04-24

申请人： MILLTRONICS LTD.

发明人： Woodward, Steven James

IPC分类号： G01S7/52 ,  G01S15/88

CPC分类号： G01F23/2962 ,  G01S7/5273 ,  G01S15/88 ,  Y10S367/901 ,  Y10S367/908

摘要： Acoustic level sensing apparatus is provided, in which pulses of acoustic energy are transmitted by an electrically energized transducer towards a surface to be sensed, and the electrical output from the transducer following the pulse received by a receiver is digitized and analyzed by a programmed microprocessor to detect a return echo from the surface, so as to produce a digitized echo profile. The digitized echo profile is enhanced by removing narrow peaks likely to correspond with certain types of spurious echo (REMOVE_NARROW_ECHOES_F0), and narrow valleys which may represent fragmentation of a wanted echo (REFORM_FRAGMENTED_ECHOES_F0). Echoes are identified by comparing the profile with a time varying threshold generated derived from a linear regression performed on part of the echo profile (TVT_IN_F2), various different types of comparison being performed and their results combined (ALF_ALGORITHM) prior to selecting the most likely true echo on the basis of the combined results (SELECT_BEST_ECHO_FROM_FILE_3).

摘要翻译： 提供声级感应设备，其中声能的脉冲通过电激励换能器传输到待感测表面，并且接收器接收的脉冲之后来自换能器的电输出被数字化并由编程的微处理器分析为 检测来自表面的返回回波，从而产生数字化的回波轮廓。 通过去除可能与特定类型的伪回波（REMOVE_NARROW_ECHOES_F0）相对应的窄峰值和可能表示有用回波碎片（REFORM_FRAGMENTED_ECHOES_F0）的窄谷值，增强了数字化回波分布图。 回声通过比较曲线与从部分回波曲线（TVT_IN_F2）上执行的线性回归生成的时变阈值来比较，在选择最可能的真实值之前执行各种不同类型的比较以及它们的结果组合（ALF_ALGORITHM） 根据组合结果回显（SELECT_BEST_ECHO_FROM_FILE_3）。