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Method of determining phase angle of complex sensitivity of hydrophone by reciprocity method. RU patent 2509441.

IPC classes for russian patent Method of determining phase angle of complex sensitivity of hydrophone by reciprocity method. RU patent 2509441. (RU 2509441):

H04R29/00 - Monitoring arrangements; Testing arrangements

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FIELD: information technology.

SUBSTANCE: invention can be used for absolute complex field calibration of hydrophones to obtain the magnitude and phase angle of sensitivity of the hydrophones for the acoustic centre of the hydrophones. The existing reciprocity method is supplemented with repeating reciprocity method procedures for a reversible transducer-calibrated hydrophone pair after turning the hydrophone by 180°. As a result, change in time delay of the signal of the reversible transducer received by the hydrophone is measured, while changing the direction of reception of the hydrophone from the initial direction to the opposite direction, and phase incursion, which corresponds to the measured time delay, is calculated at the frequency of the experiment. The hydrophone and the reversible transducer are then irradiated by a radiator and the reciprocity method procedures are repeated. The obtained phase incursion values are entered as an adjustment when determining the phase angle of the complex sensitivity of the hydrophones.

EFFECT: eliminating error in phase calibration of a hydrophone, arising due to mismatch of the geometric and acoustic centres of the hydrophone.

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The invention relates to the field of hydro-acoustics and can be used for complex absolute calibration of hydrophones (G) on the field, as a result of the module and phase angle sensitivity G for the acoustic centre,

When determining the phase angle sensitivity G method of reciprocity inevitably faces the challenge of accurately measure distances between G, reversible Converter (SOS) and the emitter (And). The problem arises from the fact that G, OP and represent the physical body of a certain size and shape, not a geometric point. On the other hand, the calibration method of reciprocity implies orientation graduated G reference direction on the OP and that requires reversal G 180 degrees. To ensure accurate measurement of the phase angle G requires that G is not shifted relative to this position during the rotation (redirect). This shift may cause small precession of the rotation mechanism (the effect of which "reinforces" the longest bar positioning G), or curvature of the rod, or any offset axis, Y-axis of rotation that may occur when installing Grams rod positioning system.

The known method of the same purposes, adopted for the prototype [1], namely, that G, OP and comes with one straight in the measuring pool, equipped with high-precision navigation G, OP and optical window and system adjustment provisions G-based laser. G is placed in between And and the OP support and guide the direction of the OP.

Laser establish so that the beam touched nearest to the OP edges, Forming tone-pulse radiation given frequency, which excite OP. Irradiated G signal SOS, take G signal SOS and perform actions based method of reciprocity, in the result of which gives the phase shift Phi OP-G signal OP accepted G, relative to the current through the OP. Then turn G 180° and focus its support towards And. Order to avoid offsets Grams due to its reorientation, after reversal G using the positioning system move along a straight OP And until, when the laser beam will again affect the nearest to the OP's edge,

Thus, in the prototype phase angle sensitivity Phi G measure for geometric, not acoustic centre, This leads to errors in the measurements of phase angle sensitivity G in cases of discrepancy acoustic and geometric centres,

The technical result from implementation of the invention, is the removal of the marked lack of a prototype, i.e. increasing the accuracy of determining the phase angle of the complex sensitivity,

The technical result is reached due to the fact that in the known method of determination of the phase angle of the complex hydrophone sensitivity of the method of reciprocity, namely, that in measuring the pool on the same line have the hydrophone, emitter and reversible Converter, with the hydrophone is placed between the radiator and reversible Converter and focus on reversible Converter, form tone-pulse radiation given frequency, which excite reversible Converter, irradiate hydrophone signal reversible Converter, take a hydrophone signal is reversible Converter and measure the phase shift Phi OP-G accepted by the hydrophone signal relative to the current through reversible Converter, then turn hydrophone around its axis 180° and focus a hydrophone emitter, re excite reversible Converter, irradiate hydrophone signal reversible Converter, take a hydrophone signal is reversible Converter, determine changes of the time delay Dt signals reversible Converter, adopted by the hydrophone before and after 180? turn due to a change in the direction of reception hydrophone from the source to the opposite, and calculate the phase shift Δφ corresponding to the measured time delay on the frequency of the experiment by the formula

Δ Phi = ω Δ t 2 ,

where the Uragan - circular frequency of the signal radiation, then stir emitter signal emission, radiated signal emitter hydrophone and take a hydrophone signal emitter, after which derive hydrophone from the zone of irradiation, radiated signal emitter reversible Converter, signal emitter reversible Converter and define the phase shift Phi And a-G,OP signal emitter, adopted by the hydrophone, the relative signal emitter adopted reversible Converter, with a phase angle Phi G integrated hydrophone sensitivity to define mathematical relationships

Phi G = 1 2 ( Phi About P - G + Phi And - G , About P ) + PI 4 + Δ Phi .

The invention is illustrated by drawings, where the scheme of the experiment for determining the phase angle of the complex sensitivity G method of reciprocity.

The essence of the method consists in that in the measuring pool (not shown) on the same line have G, OP and I. thus G is placed between the OP and support and guide the direction of the OP.

Form tone-pulse radiation given the frequency with which excite OP and is exposed to G signals OP.

Signal OP accept G and measure the phase shift Phi OP-G signal relative to the current through the OP.

He then turned around its axis 180° and Orient G reference direction of I. drawing the specified rotation shown by the arrow.

Again excite SOS signal emission, radiated G signal SOS and accept G signal SOS. Determine changes of the time delay Dt signals OP taken G before and after turn on 180 degrees due to a change in the direction of reception G from the source to the opposite.

Calculate the phase shift Δφ corresponding to the measured time delay on the frequency of the experiment by the formula

Δ Phi = ω Δ t 2 ,

where the Uragan - circular frequency of the signal radiation.

Excite And signal emission, radiated G signal and accept G signal And.

Output G from the zone of irradiation, irradiate SOS signal and take SOS signal And.

Define the phase shift Phi And a-G,OP signal And adopted G, relative signal And adopted OP.

Phase angle Phi G a comprehensive sensitivity G spot from the mathematical relationships

Phi G = 1 2 ( Phi About P - G + Phi And - G , About P ) + PI 4 + Δ Phi .

Defined this way, the phase angle will not contain errors due to mismatch between geometric and acoustic centres, This provides the technical result.

Literature

1. Hayman G. S. Robinson Phase calibration of hydrophones by the free-field reciprocity method / Proc. of the 11th European Conference on Underwater Acoustics // Edinburgh, 2012, p.1437-1444.

The method of determining phase angle complex hydrophone sensitivity of the method of reciprocity, namely, that in measuring the pool on the same line have the hydrophone, emitter and reversible Converter, with the hydrophone is placed between the radiator and reversible Converter and focus on reversible Converter, form tone-pulse radiation given frequency, which excite reversible Converter, irradiate hydrophone signal reversible Converter, take a hydrophone signal is reversible Converter and measure the phase shift Phi OP-G accepted by the hydrophone signal relative to the current through reversible Converter, then turn hydrophone around its axis 180° and focus a hydrophone emitter, wherein re excite reversible Converter, irradiate hydrophone signal reversible Converter, take a hydrophone signal is reversible Converter, determine changes of the time delay Dt signals reversible Converter, adopted by the hydrophone before and after 180? turn due to a change in the direction of reception hydrophone from the source to the opposite, and calculate the phase shift Δφ corresponding measured time delay on the frequency of the experiment by the formula

Δ Phi = ω Δ t 2 ,

where the Uragan - circular frequency of the signal radiation, then stir emitter signal emission, radiated signal emitter hydrophone and take a hydrophone signal emitter, after which derive hydrophone from the zone of irradiation, radiated signal emitter reversible Converter, signal emitter reversible Converter and define the phase shift Phi And a-G,OP signal emitter, adopted by the hydrophone, the relative signal emitter adopted reversible Converter, with a phase angle Phi g of compound the hydrophone sensitivity to define mathematical relationships

Phi G = 1 2 ( Phi About P - G + Phi And - G , About P ) + PI 4 + Δ Phi .