Results 241 to 250 of about 269,417 (292)
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Acoustically monitored manometer
The Journal of the Acoustical Society of America, 1988A U-tube manometer for calibrating a differential pressure transducer or the like, wherein the height of working fluid in each column may be determined by the two-way travel time of an acoustic pulse launched from the top of each column against the top of the working fluid.
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Acoustic monitoring of hydrocyclones
Powder Technology, 2002This paper considers a case study of using non-intrusive passive acoustic sensors for on-line monitoring of hydrocyclone performance. Acoustic emissions generated within a hydrocyclone treating fine silica slurries were collected using a single 190-kHz piezoelectric sensor mounted externally on the conical section of the hydrocyclone. The investigation
R Hou, A Hunt, R.A Williams
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Proceedings of 17th International Conference of the Engineering in Medicine and Biology Society, 2002
The Army Research Laboratory has developed sensor technology to monitor patient condition by gathering and analyzing acoustic data. Acoustic signature analysis can indicate cessation of breathing or heartbeat. Advanced signal-processing techniques can determine the proper level of response for the indicated condition, and alert attendants via ...
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The Army Research Laboratory has developed sensor technology to monitor patient condition by gathering and analyzing acoustic data. Acoustic signature analysis can indicate cessation of breathing or heartbeat. Advanced signal-processing techniques can determine the proper level of response for the indicated condition, and alert attendants via ...
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The Journal of the Acoustical Society of America, 1994
A system for real-time analysis of weld quality in an arc welding process. The system includes a transducer which receives acoustic signals generated during the welding process. The acoustic signals are then sampled and digitized. A signal processor calculates the root mean square and peak amplitudes of the digitized signals and transforms the ...
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A system for real-time analysis of weld quality in an arc welding process. The system includes a transducer which receives acoustic signals generated during the welding process. The acoustic signals are then sampled and digitized. A signal processor calculates the root mean square and peak amplitudes of the digitized signals and transforms the ...
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The Journal of the Acoustical Society of America, 1984
A system and method are disclosed for monitoring the acoustic intensity of ultrasonic energy applied to a body by an ultrasonic probe for the purpose of diagnosing an internal target. The probe contacts a limited area of the body skin and a coupling medium, such as a coupling gel, is interposed to enhance acoustic coupling between the probe and the ...
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A system and method are disclosed for monitoring the acoustic intensity of ultrasonic energy applied to a body by an ultrasonic probe for the purpose of diagnosing an internal target. The probe contacts a limited area of the body skin and a coupling medium, such as a coupling gel, is interposed to enhance acoustic coupling between the probe and the ...
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Laser ablation acoustical monitoring
Applied Surface Science, 1997Short pulses laser generated shock waves in air during the ablation of ceramics have been monitored with acoustical techniques. We have found that on a given laser fluence domain the ablation rate can be related to the shock wave energy. This shock wave energy is measured both with the laser beam deflection technique and a microphone.
C Stauter +3 more
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The Journal of the Acoustical Society of America, 1986
Acoustic emission monitoring is a non-destructive testing technique that ects ultra-high frequency sound that stressed metal emits. In straightening a gun tube the workpiece is at first under no stress, is elastically deformed (with total springback when pressure is released), is plastically deformed (with some springback upon release of pressure), or
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Acoustic emission monitoring is a non-destructive testing technique that ects ultra-high frequency sound that stressed metal emits. In straightening a gun tube the workpiece is at first under no stress, is elastically deformed (with total springback when pressure is released), is plastically deformed (with some springback upon release of pressure), or
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The Journal of the Acoustical Society of America, 1998
For a number of years railroad wheels were used as test objects in developing acoustic signature monitoring techniques. This work will be reviewed as well as later laboratory studies using beams to determine the sensitivity of the method. Cracks and other defects can cause shifting and splitting of resonance frequencies, so that these changes can be ...
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For a number of years railroad wheels were used as test objects in developing acoustic signature monitoring techniques. This work will be reviewed as well as later laboratory studies using beams to determine the sensitivity of the method. Cracks and other defects can cause shifting and splitting of resonance frequencies, so that these changes can be ...
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Auditory Monitoring During Acoustic Neuroma Removal
Archives of Otolaryngology - Head and Neck Surgery, 1991Preservation of hearing has become attainable for patients with small acoustic neuromas. Brain-stem auditory evoked response was monitored intraoperatively in 60 patients undergoing acoustic neuroma surgery via the posterior fossa approach. The overall rate of hearing preservation was 30% in the monitored group and 20% in 60 patients who were matched ...
D H, Slavit +3 more
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Acoustic emission data assisted process monitoring
ISA Transactions, 2002Gas-liquid two-phase flows are widely used in the chemical industry. Accurate measurements of flow parameters, such as flow regimes, are the key of operating efficiency. Due to the interface complexity of a two-phase flow, it is very difficult to monitor and distinguish flow regimes on-line and real time.
Gary G, Yen, Haiming, Lu
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