Hydrophones are used for
picking up weak sound vibrations
under water and the signal must
be amplified by a high impedance
hydrophone amplifier in order
to convert the extreme high output
impedance from the hydrophones
piezoelectric ceramic into a
low impedance signal which can be handled by
commonly available signal
processing equipment.
Hydrophones and amplifiers are used for studying underwater acoustics and monitoring of sonar and communication sound signals from dolphins, porpoises and whales and detection of acoustic pingers and detection of cetacean clicks.
Etec amplifers for Hydrophones. Our Amplifiers are "state of the art" in performance
and especially designed to be
used together with piezoelectric
hydrophones. Recommended types
of hydrophones may be the following
types which we have chosen in
order to cover all types of demands
from the highest scientific
level to more common requirement
into high quality sound recording.
The impedance conversion rate is normally 1 to 10e9 ie. from an input impedance of 10 Giga ohm down to 10 ohm on the amplifiers output terminal.
The etec line of amplifers offers
an input impedance of 1 to 10
Gigaohm and 10picofarad which
is sufficient to handle the frequency
range from 0.1Hz to 1MHz even
with the smallest types of transducer
ceramics. We are capable
of handling low level signals
down to 1uVolt rms at 1KHz. which
equals just about 60dB signal level under water.
TC4033 or TC4034 Reson
hydrophones
Passive hydrophones equipped
with BNC
connector. Ideal
for both receiving
and transmitting. They
will both be able
to handle 100Volt
transmitting signal
at 10% duty cycle.
Robust
Spherical
Reference
Hydrophone TC4033 :
Frequency
(kHz)
1Hz
to 160kHz
Recieving
Response
(dB)
- 203dB ±3dB at 250kHz
Operating
Depth
900m
Robust Spherical Reference
Hydrophone
TC4034 :
Frequency (kHz) 1Hz to 470kHz
Recieving Response (dB) - 218dB ±3dB at 250kHz
Operating Depth 900m
Picture
showing Reson
TC4033 hydrophone
inclusive the adaptor
for Hirose
7 pole
to BNC connector
. Used to
connect standard
type Reson
TC4033 or
eq. with
BNC connectors
to suit for
the etec
PD1102 portable
fishery inspection
and listening
amplifier.
The 7 pole
Hirose adaptor
to be delivered
on reuest.
Aquarian Audio Hydrophones
These hydrophones
represent
the best
choises
for alternative
hydrophones
which will
suit smaller
budgets.
The calibration
is not
included
but the
sound
quality
and the
general
performance
is very
good.
You may buy them directly
from Aquarian
Audio or
you can buy
them from
here together
with our
eqipment
- the price
will be the same.
H1a-BNC
hydrophone data
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to view pdf file. Opens
in a popupwindow
The H1a hydrophone
is designed
to provide
high-quality
audio performance
in a low-cost
device. It
is very durable
and will interface
directly with
high-impedance
microphone
or instrument
preamps. It
offers very
good sensitivity
and low noise
in the human
auditory range.
The H1a’s
streamlined
shape and high
specific gravity
will help to
maintain a
low working
depth in a
moving water
column. Its
compact size
and the easy
hand of its
cable make
it very portable
and simple
to use.
Sensitivity :
-190dB re: 1V/µ
Pa
(+/- 4dB 20Hz-4KHz)
Useful range
:
1 Hz to 100KHz
Approximate
sensitivity
: @100KHz =
-220dB re:
1V/µ Pa
H2a-XLR
hydrophone data
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to view pdf file.
Opens in a popupwindow
The H2a-XLR hydrophone is designed to work with any PA system or recording device that offers a balanced, phantom-powered, microphone input. It uses the same low-noise,
robust transducer assembly as our H1 hydrophone, but includes a low noise internal buffer amp. Operation is very simple: just connect to your mic preamp, switch on phantom power and use. No additional power supply is required.
Sensitivity :
-180dB re: 1V/µ
Pa
(+/- 4dB 20Hz-4.5KHz)
Useful
range : 10
Hz to 100KHz
Approximate sensitivity
: @100KHz = -220dB
re: 1V/µ Pa
AS-1-BNC
hydrophone data
datacharts-Click
to view pdf file.
Opens in a popupwindow
The AS-1 hydrophone is designed to provide maximum sensitivity in a small size while also providing a linear response in the bandwidth of the highest-quality commercial digital sound recording interfaces.
Response is omnidirectional in the human auditory bandwidth, as well as omnidirectional in the horizontal axis at all
frequencies (theoretical). Given these qualities, the AS-1 is well-suited for absolute underwater sound measurements in marine and industrial environments. It can also be used as an omnidirectional reference projector.
Linear range : 1Hz to 100kHz ±2dB
Receiving
Sensitivity
: -208dBV
re 1µPa (40µV / Pascal)
Transmitting
Sensitivity :
140dB SPL re
1µPa at
90kHz
Facta box
A hydrophone (Greek "hydro" = "water" and "phone" = "sound") is a microphone designed to be used underwater for recording or listening to underwater sounds. Most hydrophones are based on a piezoelectric transducer that generates electricity when subjected to a pressure change. Such piezoelectric materials, or transducers can convert a sound signal into an electrical signal since sound in water is a pressure wave in fluids.
Sonar
Sonar is the name given to the acoustic equivalent of radar. Pulses of sound are used to probe the sea, and the echoes are then processed to extract information about the sea, its boundaries and submerged objects. An alternative use, known as passive sonar, attempts to do the same by listening to the sounds radiated by underwater objects.
Hydrophones
