2016年6月21日 · You are unlikely to see ghost echoes related to PRF or "wraparound" when testing cast iron in the thickness range 30 mm to 200 mm. That problem most commonly occurs when testing across much longer sound paths in low …

2016年10月21日 · The PRF is a function of the RF section of the Ultrasonic instrument or board. From the perspective of static acquisition (no movement of the transducer) The PRF should match the material velocity and echo return distance, with a safety factor so that there is not two wave trains in the material at the same time, causing a collision of the ...

2013年12月11日 · PRF is the number of times per second that the transducer is pulsed to excite energy into the testing medium (this should not be confused with the frequency of the actual transducer). At a high PRF, there will be more transmitted ultrasonic pulses firing within a fixed time interval than at a low repetition frequency.

PRF/Ghost echos. Dear colleagues The repetition rate(PRF, or pulse repetition frequency) is the firing frequency of the ultrasonic signal; PRF depends on averaging, aquisition time, delay befor aquisition, gate length, processing time ...

2021年12月9日 · 脉冲重复频率（PRF，Pulse Recurrence Frequency），是一个仪器参数。 我们知道，现代的超声波检测技术使用的是 脉冲 反射法，即向物体发射一个短 脉冲 超声波，再接收它，如此往复。

2011年7月12日 · 如果用PRF_CSEND和PRF_CRECV那要麻烦的多。必须放在#if RP_NODE #if RP_HOST之类宏保护作用范围内，还要判断是否0节点，手动在node-0地方用PRF_CSEND，在其它节点接受的地方用PRF_CRECV。 [本帖最后由 gearboy78 于 2011-6-10 05:52 编辑 ]

The selection of an optimal PRF set is constrained by radar system characteristics, application requirements, ghost minimization, and sampling rates. The paper presents an efficient combinatorial approach to calculate PRF set quality, addressing these constraints and discussing their implications to enhance radar performance.

This example shows how to simulate ghost target detections and tracks due to multipath reflections, where signal energy is reflected off another target before returning to the radar. In this example you will simulate ghosts with both a statistical radar model and a transceiver model that generates IQ signals.

2020年9月1日 · However, our analysis shows that the extracted tracks after thresholding the merit function contain a large number of false tracks due to the measurement ambiguities, referred to as ghost tracks.

These mainly appear with straight beam scanning and low sound attenuation. However, they may also appear on small test objects and with low test frequency. Countermeasures include decreasing the pulse repetition frequency (PRF). Similar effects are possible due to mode conversion, however those do not rely on the PRF. Illustrations: