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本文介绍参量阵在信息传送、水下电话、海底剖面测量等应用的近年发展,以及参量相控发射阵在提高参量声呐性能方面的潜力:阐述矩形参量相控发射阵的设计和性能计算,给出测试结果。所研制阵的两个原频声波频率分别为f_L=41～45kHz,f_H=46～49kHz。差频声波频率f_N=3～8kHz。波束宽度θ_(-3dB)=6.7°,随f_s变化很小。在f_s=7kHz时,差频声源级SL_s超过186dB,参量增益G约为-41dB。在相控信号激励下,差频波束与原频波束同步扫描,在相控角θ_0不大时(θ_0≤12°),θ_(-3dB)几乎不随θ_0变化,当θ_0=12°时,SL_s平均下降2.2dB,可满足多波束发射的需要。
This article introduces the recent development of parametric arrays in applications such as information transmission, underwater telephony and subsea profiling, as well as the potential of parametric phased-emitter arrays to enhance parametric sonar performance. The design and performance calculation of rectangular phased-array transmitters The test results. The frequency of the two original frequencies of the developed array are respectively f_L = 41-45kHz and f_H = 46-49kHz. Difference frequency sound frequency f_N = 3 ~ 8kHz. Beam width θ_ (-3 dB) = 6.7 °, with small changes in f_s. At f_s = 7 kHz, the difference frequency sound source stage SL_s exceeds 186 dB and the parameter gain G is about -41 dB. Under the phase-controlled signal excitation, the difference frequency beam is scanned synchronously with the original frequency beam, and θ_ (- 3dB) hardly changes with θ_0 when the phasing angle θ_0 is not large (θ_0≤12 °). When θ_0 = 12 °, SL_s An average drop of 2.2dB, to meet the needs of multi-beam launch.