An instrument is described for laboratory measurements of the fluctuating static pressure in the turbulent boundary layer above progressive water waves. It consists of a disk‐shaped sensing head properly designed to minimize the dynamic pressure variation to an acceptable level, a commercially available piezocrystal transducer housed inside a casing, and a forward‐bent connecting tube. Pressure fluctuations sampled by the disk are converted into an electrical signal by the piezocrystal transducer. Through low‐pass filtering, only the frequency range of interest is retained. The instrument was tested successfully for frequency response, dynamic and mechanical noise sensitivity, and response to spurious pressure fluctuations (produced when operating in a Eulerian wave‐following mode) inside a cylindrical chamber and in a wind–wave facility, and some sample results along with the calibration procedures and data analysis are presented.

1.
O. H.
Sheradin
and
E. Y.
Hsu
,
J. Fluid Mech.
30
,
403
(
1967
).
2.
H. Y. Yu, E. Y. Hsu, and R. L. Street, Civil Eng. Dept. Rep. No. 146, Stanford University (1973).
3.
F. W.
Dobson
,
J. Fluid Mech.
48
,
91
(
1971
).
4.
J. A.
Elliott
,
J. Fluid Mech.
54
,
427
(
1972
).
5.
R. L.
Snyder
,
J. Mar. Res.
32
,
497
(
1974
).
6.
J. W.
Miles
,
J. Fluid Mech.
3
,
185
(
1957
).
7.
C. T.
Hsu
,
E. Y.
Hsu
, and
R. L.
Street
,
J. Fluid Mech.
105
,
87
(
1981
).
8.
R. L.
Snyder
,
F. W.
Dobson
,
J. A.
Elliott
, and
R. B.
Long
,
J. Fluid Mech.
102
,
1
(
1981
).
9.
Y. A. Papadimitrakis, Ph.D. dissertation, Civil Engrg. Dept., Stanford University, 1982.
10.
H. L. Norris and W. C. Reynolds, Mech. Engrg. Dept., Rep. TF‐7, Stanford University, 1975.
11.
Y. A.
Papadimitrakis
,
E. Y.
Hsu
, and
R. L.
Street
,
J. Acoust. Soc. Am.
77
,
896
(
1985
).
12.
This tube and the pressure probe were aligned in both longitudinal and vertical directions with a spanwise separation of 5 cm.
13.
R.
Shaw
,
J. Fluid Mech.
7
,
550
(
1960
).
14.
This figure may be an overestimate of the real error due to an apparent source of noise caused by temperature fluctuations of the air behind the films.
15.
This frequency band corresponds to the spectral bandwidth of wind‐waves in the presence of a 1 Hz, mechanically generated wave, for wind speeds <5.0 m/s.
16.
E. Y. Hsu, Civil Eng. Dept., Tech. Rep. No. 57, Standford University, 1965.
17.
K.
Takeuchi
and
T. R.
Mogel
,
Rev. Sci. Instrum.
46
,
686
(
1975
).
18.
Monitored with a wave‐height gauge.
19.
Y. A.
Papadimitrakis
,
E. Y.
Hsu
, and
R. L.
Street
,
J. Phys. Oceanogr.
14
,
1937
(
1984
).
20.
M. M.
Gibson
and
B. E.
Launder
,
J. Fluid Mech.
86
,
491
(
1978
).
21.
A. A.
Townsend
,
J. Fluid Mech.
81
,
171
(
1980
).
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