公开(公告)号：WO1996001701A1

公开(公告)日：1996-01-25

申请号：PCT/US1995008682

申请日：1995-07-11

Applicant: IOWA STATE UNIVERSITY RESEARCH FOUNDATION, INC.

Inventor： IOWA STATE UNIVERSITY RESEARCH FOUNDATION, INC. ,  UDPA, Satish, S. ,  VASUDEVAN, Srivatsa

IPC: B06B01/02

CPC classification number: B06B1/0215 ,  B06B1/0284 ,  B06B2201/40 ,  B06B2201/70 ,  Y10S73/01

Abstract: A method and apparatus for electronically driving an ultrasonic acoustic transducer. The transducer is operable in two modes; in a first mode, the lock-in frequency of the transducer is determined; in a second mode, the lock-in frequency determined in the first mode is used to modulate a tone-burst pulse to drive the transducer in an efficient manner. Operating in the first mode, the lock-in frequency is determined by exciting the transducer with a series of tone bursts, where each tone burst comprises an electronic pulse modulated by a tone of one frequency selected from a range of frequencies, and measuring the response of the transducer to each tone burst. In an alternative embodiment, the excitation of the transducer in the first mode is provided by a signal whose frequency is swept over a range. The response of the transducer is sampled at various times during the sweep. The lock-in frequency is chosen by examining the responses and choosing the frequency which gives the best response. Operating in the second mode, the transducer is driven with an electronic tone burst generated by modulating said an electronic pulse with a tone of the determined lock-in frequency.

Abstract translation: 一种用于电子驱动超声波换能器的方法和装置。 传感器可在两种模式下操作; 在第一模式中，确定换能器的锁定频率; 在第二模式中，使用在第一模式中确定的锁定频率来调制色调脉冲以有效地驱动换能器。 在第一模式中操作，锁定频率通过用一系列音调脉冲激发换能器来确定，其中每个音调包括由从频率范围中选择的一种频率的音调调制的电子脉冲，以及测量响应 的传感器到每个音调突发。 在替代实施例中，在第一模式中的换能器的激励由频率被扫过范围的信号提供。 在扫描过程中不同时间对传感器的响应进行采样。 通过检查响应并选择给出最佳响应的频率来选择锁定频率。 在第二模式下操作，换能器通过用所确定的锁定频率的音调调制所述电子脉冲而产生的电子音调脉冲来驱动。