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    High gain wide band acoustic surface wave transducers using parametric upconversion
    1.
    发明授权
    High gain wide band acoustic surface wave transducers using parametric upconversion 失效
    使用参数UPCONVERSION的高增益带宽声波表面波导

    公开(公告)号：US3684892A

    公开(公告)日：1972-08-15

    申请号：US3684892D

    申请日：1970-10-15

    Applicant: IBM

    Inventor： LEAN ERIC GUNG HWA ,  POLE ROBERT VALDIMIR ,  TSENG SAMUEL CHIN-CHONG

    IPC: G06G7/195 ,  H03F13/00 ,  H03H9/145 ,  H03H9/25 ,  H03H9/64 ,  H03H9/72 ,  H03F3/04 ,  H03F7/00

    CPC classification number: H03F13/00 ,  G06G7/195 ,  H03H9/72

    Abstract: Parametric upconverter acoustic surface wave transducer exhibiting high efficiency with wide band operation. The transducer consists of a combination of two constituent transducers, one a narrow bandwidth, high efficiency transducer and the other a wide bandwidth, low efficiency transducer, coupled to produce a resultant acoustic wave of a frequency equal to the sum of the frequencies of acoustic waves supplied by the low and high efficiency transducers. By properly selecting the center frequency of the low efficiency transducer relative to center frequency of the high efficiency transducer as well as the input electric power, the efficiency of the transducer of this invention may be made greater than the efficiency of the low efficiency transducer while retaining its wide bandwidth.

    Abstract translation: 参数上变频器声表面波换能器在宽带操作中表现出高效率。 传感器由两个构成传感器组成，一个是窄带宽，高效率的换能器，另一个是宽带宽，低效率的换能器，耦合到产生频率等于声波频率之和的合成声波 由低和高效传感器提供。 通过适当地选择低效率换能器相对于高效换能器的中心频率的中心频率以及输入功率，本发明的换能器的效率可以大于低效换能器的效率，同时保持 其宽带宽。

    2.
    发明专利
    未知

    公开(公告)号：DE2231409A1

    公开(公告)日：1973-01-18

    申请号：DE2231409

    申请日：1972-06-27

    Applicant: IBM

    Inventor： LEAN ERIC GUNG HWA ,  POWELL CARL GEORGE

    IPC: G02F1/335 ,  G02B27/00

    Abstract: An acoustical deflector for electromagnetic waves using a dispersive medium for propagation of the acoustic waves. That is, the thickness of the medium is approximately the wavelength lambda of the acoustic wave so that the phase velocity of the acoustic wave is a function of the acoustic wave frequency. Electromagnetic waves which interact with the acoustic wave fronts are deflected through different angles as the phase velocity of the acoustic wave changes due to frequency changes of this wave. Means are provided to excite an adjustable frequency acoustic wave in the dispersive medium.

    4.
    发明专利
    未知

    公开(公告)号：DE2657562A1

    公开(公告)日：1977-07-07

    申请号：DE2657562

    申请日：1976-12-18

    Applicant: IBM

    Inventor： LEAN ERIC GUNG HWA

    IPC: H01L29/66 ,  G10K11/36 ,  H01L27/14 ,  H01L31/00 ,  H04N1/04 ,  H04N3/10 ,  H04N3/14 ,  H01L31/08 ,  H01L41/10

    Abstract: 1530928 Acoustic wave device for scanning optical signals INTERNATIONAL BUSINESS MACHINES CORP 11 Nov 1976 [29 Dec 1975] 47059/76 Heading G1G An optical signal scanner comprises a photoconductor 12 on a Piezo-electric substrate 10, an input/output transducer 15 for coupling acoustic waves to and from the substrate 10, and a further pair of electrodes 13, 14 in the region of which a line of optical dot signals is focused; when an acoustic wave from transducer 15 is co-extensive with the optical signals, an electric pulse is applied between electrodes 13, 14 thus coupling an electric field to substrate 10 whose amplitude is modulated in dependence upon the local photo-induced resistance of photo-conductor 12, and a backward acoustic wave, which is produced by the parametric interaction of the input acoustic wave and the electric field, is received by transducer 15. Electrodes 13, 14 may be replaced by interdigitated electrodes (31, 32) Fig. 4A (not shown) or by planar electrodes (20, 21) Fig. 3A (not shown), one of which is transparent, on opposite major surfaces of substrate 10. Transducer 15 is preferably a surface wave transducer.

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