Void detecting device

Patent · Mon Jan 01 00:00:00 EST 1979

OSTI ID:863310

Nakamoto, Koichiro ^[1]; Ohyama, Nobumi ^[1]; Adachi, Kiyoshi ^[1]; Kuwahara, Hajime ^[2]

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1. Tokyo, JP
2. Musashino, JP

A detector to be inserted into a flowing conductive fluid, e.g. sodium coolant in a nuclear reactor, comprising at least one exciting coil to receive an a-c signal applied thereto and two detecting coils located in the proximity of the exciting coil. The difference and/or the sum of the output signals of the detecting coils is computed to produce a flow velocity signal and/or a temperature-responsive signal for the fluid. Such flow velocity signal or temperature signal is rectified synchronously by a signal the phase of which is shifted substantially .+-. 90.degree. with respect to the flow velocity signal or temperature signal, thereby enabling the device to detect voids in the flowing fluid without adverse effects from flow velocity variations or flow disturbances occurring in the fluid.

• Assignee: Doryokuro Kakunenryo Kaihatsu-Jigyodan (Tokyo, JP); Yokogawa Electric Works, Ltd. (Tokyo, JP)
• Patent Number(s): US 4144741
• OSTI ID: 863310
• Country of Publication: United States
• Language: English

Related Subjects

void
detecting
device
detector
inserted
flowing
conductive
fluid
sodium
coolant
nuclear
reactor
comprising
exciting
coil
receive
a-c
signal
applied
thereto
coils
located
proximity
difference
output
signals
computed
produce
flow
velocity
temperature-responsive
temperature
rectified
synchronously
phase
shifted
substantially
90
degree
respect
enabling
detect
voids
adverse
effects
variations
disturbances
occurring
adverse effects
sodium coolant
flowing fluid
conductive fluid
signal applied
applied thereto
output signals
nuclear reactor
output signal
flow velocity
detecting device
temperature signal
coils located
a-c signal
/73/324/