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This paper studied the effect of different coupling agents on ultrasonic detection of partial discharge. Water-based ultrasonic coupling agents, medical coupling agents and silica gel coupling materials were compared with commonly used high-vacuum silicone greases to analyse the different response by using different coupling materials to detect the...
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Context 1
... the frequency spectrum of the signal when the frequency is 20 kHz and 60 kHz, as shown in Figure 2 It can be seen from Figure 2 that when the input signal frequency is 20kHz, the frequency components of signal 1 and signal 2 are 20kHz, but the amplitude of signal 2 is greater than signal 1, and the amplitude of corresponding time domain signal is greater than signal 1, which is consistent with the data trend in Table 1, indicating that the response of water-based ultrasonic couplant in this frequency band should be better than that of standard couplant; when the input signal frequency is 60kHz, the frequency components of signal 1 and signal 2 are both 60kHz, but the amplitude of signal 2 is obviously smaller than that of signal 1, and the amplitude of corresponding time domain signal is smaller than that of signal 1, which is consistent with the data trend in Table 2. Under this frequency band, the response of standard coupling agent is better than that of water-based coupling agent. ...
Context 2
... the frequency spectrum of the signal when the frequency is 20 kHz and 60 kHz, as shown in Figure 2 It can be seen from Figure 2 that when the input signal frequency is 20kHz, the frequency components of signal 1 and signal 2 are 20kHz, but the amplitude of signal 2 is greater than signal 1, and the amplitude of corresponding time domain signal is greater than signal 1, which is consistent with the data trend in Table 1, indicating that the response of water-based ultrasonic couplant in this frequency band should be better than that of standard couplant; when the input signal frequency is 60kHz, the frequency components of signal 1 and signal 2 are both 60kHz, but the amplitude of signal 2 is obviously smaller than that of signal 1, and the amplitude of corresponding time domain signal is smaller than that of signal 1, which is consistent with the data trend in Table 2. Under this frequency band, the response of standard coupling agent is better than that of water-based coupling agent. ...
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Citations
... The wave is transmitted through the medium of interest with the aid of a couplant. 9 The return wave is then captured with a receiver. With the knowledge of the time-of-flight and the distance of travel, the ultrasonic velocity can be calculated. ...
During machining processes, the temperature of the workpiece may vary due to different factors. One of such factors is the heat generated due to tool/workpiece friction. Temperature may also vary due to environmental conditions. These temperature variations can affect the dimensional accuracy of the manufactured workpiece. It is known that the expansion of a part is related to a change in its average temperature, which is influenced more by the internal, core temperature than the surface temperature. The surface temperature of the part being manufactured can vary significantly from the core temperature, especially during dry cutting processes. Therefore, to effectively control or compensate for the effects of temperature variation as it relates to material expansion, there is a need to measure the core temperature of the workpiece accurately. In this article, a novel ultrasonic phase-shift method for temperature measurement is used to measure the core temperature of a workpiece on a computer numerical control machine (CNC). The results show that the phase-shift ultrasonic thermometry method measures steel workpiece temperature during subtractive manufacturing processes with deviations of less than 61°C when compared to the reference PT100 readings. This novel temperature measurement method can be used in different manufacturing processes as part of a temperature control or thermal error compensation system.
... Examples of special contact conditions sometimes requiring specific couplant media and/or sensor mounts are AE sensors coupled to biological tissue [76]; to electric power devices, mainly applied for detection of partial electric breakdown [77], in corrosive environments [78], in nuclear or ion radiation areas [79]; to snow or ice [80,81]; and possibly to certain art and archaeological objects where couplants and sensors may not leave any mark and surface preparation of the test object is not possible. Some of the conditions noted here may not only require special couplant materials but may also affect the short-term or long-term performance of the transducers themselves. ...
Acoustic Emission (AE) and Guided Ultrasonic Waves (GUWs) are non-destructive testing (NDT) methods in several industrial sectors for, e.g., proof testing and periodic inspection of pressure vessels, storage tanks, pipes or pipelines and leak or corrosion detection. In materials research, AE and GUW are useful for characterizing damage accumulation and microscopic damage mechanisms. AE and GUW also show potential for long-term Structural Health and Condition Monitoring (SHM and CM). With increasing computational power, even online monitoring of industrial manufacturing processes has become feasible. Combined with Artificial Intelligence (AI) for analysis this may soon allow for efficient, automated online process control. AI also plays a role in predictive maintenance and cost optimization. Long-term SHM, CM and process control require sensor integration together with data acquisition equipment and possibly data analysis. This raises the question of the long-term durability of all components of the measurement system. So far, only scant quantitative data are available. This paper presents and discusses selected aspects of the long-term durability of sensor behavior, sensor coupling and measurement hardware and software. The aim is to identify research and development needs for reliable, cost-effective, long-term SHM and CM with AE and GUW under combined mechanical and environmental service loads.
