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Determination of the sound source using light-induced surface tug towed array shape and position of

3012】 0I530072975J2922 *) I300l2994t29802922922820J27t. 6 by the _fS. And S! abeam in tow. Therefore, only a very f tug pitch before and after the shift is clear when the shaft angle is the degree of pitch (inclination stern as lF, otherwise it is negative), I number the location of primitive component Y. 6yl should be added a correction value E (/ tSO) H7 (361 for example, when y = 15 时. Yl: 7.85m should be noted that, according to the amount of error in the previous section on estimation of Quine, in order to improve the accuracy of Y should be made longer to This allows mirror to the laser beam reflected from the front of the tugboat shad. But. Then s and s,[link widoczny dla zalogowanych], t is the change in the x-axis, but xoy plane change: As a result, the positioning of the sound source itself is troublesome than the saddle a l6 eleven ● fl will also bring heavy additional error,[link widoczny dla zalogowanych], which may outweigh the benefits. Now then clamor of laser energy to make an estimate. literature 【2 eyelashes for r the following information: Co2 laser pulse width is given 3 # s energy density of the laser 5J/cm diameter of about lcm to Cambodia when the vertical surface exposure. to excite the radiation at such a sound source, the source of the sound generated by the pulse propagation in the permanent width of acoustic signal 20 - 50 / ~ s, it also has sound to the F axis perpendicular to the approximate shape of the directional cosine in the axial direction of the sound. In 2o ~ 50kHz frequency sound source within the seal as 1823dBIreI/iP). Thus can the energy density of the laser should have given a general range. Because R = (+ + zb = (300 +800'4-100) ... = 860m, f = 50kHz absorption coefficient 2OdB/km, so the propagation loss for the 201g860 +20 × 086:76 dB; because of RN and vertical angle of jealousy = COS.. (zN / RN) = 83.3., so} Ij source directivity caused by the loss of ~ [201g (cos (o) l = 18.7dB; in the six sea conditions 20-50kHz frequency range of marine noise * satin is 60dB; Thus, when taken when the SNR is 10dB, the required light-induced source-level sound source should be 164.7dB. {fJ light-induced acoustic pressure generated by sound source proportional to the intensity of the laser beam,[link widoczny dla zalogowanych], and inversely proportional to the irradiated area, so the demand by the oblique irradiation of laser direct surface area than when the big / Ⅳ left foot 10 times, can be dipped more energy than needed to be a large fire grate 20dB to the CO2 laser beam in foggy weather conditions in the attenuation coefficient 40dB/km, available for the propagation attenuation of 300m l2dB then from (1647 +20 +12 BU 18Z7-18 (dB) can be obtained: when the laser beam emission Jian energy density should be at least 25 times above ff {, that 125J/cm. 5. The purpose of this discussion is to theoretically investigate the use of light-induced real-time determination of the source water tug towed array shape and location of the feasibility. in specific implementation, but also may appear unexpected situation to be resolved. There can be interest only in respect to the current discussion of several issues as follows: (I) assumed that the text line arrays at the base just below the Y axis, so when the tug turn, the base element deviate from the reference position of the offset component can be large, and thus . also be based on the location of each primitive fitted with the most Xiao Shengfa straight line as a benchmark. (2) The light-induced sound source is directional, so the hearing never too close to the surface H may not receive the letter analogy,[link widoczny dla zalogowanych], but the sound pulse deep release to install the fork is very difficult. this can be installed in a number of H as the ball falls in the nose first. Then the distance from S to 0:00 can be obtained from the following formula:: (sH B - h H were listening to the water turning z-axis control horizontal distance and vertical distance to the surface. Let h = 5m, then when the laser energy density 250J/cl-n2,[link widoczny dla zalogowanych], H of the input signal to noise ratio of up to 5dB (3) As the laser beam on the surface of the grazing angle is very small permanent. So there can be a laser beam irradiation to the crest on the grate. In this case F, light-induced source of what the sound source level? this be the future of the experimental measurements. If the sound source level is too small, it had no choice but to less than t = R / c time interval bursts of laser beam. until the sound signal is received. This article courtesy of Comrade Meng-Um reviewed and provided valuable advice. grateful to reference Air Xian Ping Yi 【】 Single: cover drag ripple hope for success of the class line array type of rubbish carefully. ..
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