1971 ◽  
Vol 35 ◽  
pp. 27-29
Author(s):  
P Sørensen

During last summer 3388 field measurements of the thorium and uranium content of the lujavrites from the Ilimaussaq intrusion were carried out with a portable spectrometer (Løvborg, 1967; Løvborg et al. 1968; Løvborg et al. in press) consisting of a seintillation detector and a single-channel pulse-height analyser. Within selected small areas measurements were made at the joints of a 1m grid.


1976 ◽  
Vol 9 (8) ◽  
pp. 626-628
Author(s):  
G P Agarwal ◽  
R Chandrasekhar ◽  
S K David ◽  
Y W Pande

1989 ◽  
Vol 111 (4) ◽  
pp. 502-509 ◽  
Author(s):  
S. A. Fry

Digital pulse amplitude acquisition systems are reviewed and an analogue pulse height analyser (PHA) is described. Cavitation experiments are reported in which pressure pulses in the liquid (water) are picked up by a flush mounted pressure transducer and measured using the PHA. Tests were carried out on two cavitation sources: a 60 deg symmetric wedge and a circular cylinder. Despite generating similar r.m.s. noise levels the wedge is 21 times as damaging as the circular cylinder at peak noise flow conditions (at V = 16 m/s). By imposing thresholds on the spectra parameters it had been possible to find a linear calibration beween noise and erosion applicable to both cavitation sources over a range of flow velocities. A good correlation between cavitation noise and erosion was found by simply measuring the number of pulses above a suitable threshold.


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