76results about How to "Low acoustic impedance" patented technology

An ultrasound transducer array with at least one composite material layer. The layer having a polymer base in which polymer particles are embedded. The polymer particles are coated with a material that has a thermal conductivity that is higher than the thermal conductivity of the polymer base and the polymer particles.

The invention provides a wireless intelligent Kegel pelvic muscle training device and a control method of the wireless intelligent Kegel pelvic muscle training device. Pelvic muscle pressure is collected through a thin-film pressure sensor, and biological feedback is performed according to the magnitude of the pressure, so that the vibration intensity of pelvic muscle training is adjusted; non-traumatic treatment is performed on postpartum women and uracratia patients through human-computer interaction so that the rehabilitation effect can be achieved. The wireless intelligent Kegel pelvic muscle training device has the ingenious advantages that a targeted training course can be performed according to the age group and the disease degree of the patients; treatment data of the training device can be compared with historical treatment data at different treatment stages in real time; accordingly, the treatment scheme can be adjusted and optimized, and therefore insufficient treatment or overtreatment is avoided.

The invention discloses a composite film-based frequency-adjustable surface acoustic wave gyro, which comprises a magnetostrictive substrate, a piezoelectric film, a surface acoustic wave resonator, a surface acoustic wave detector, a metal dot matrix, a phase-shift network and a radio-frequency amplifier. The piezoelectric film is covered on the magnetostrictive substrate; the surface acoustic wave resonator, the surface acoustic wave detector and the metal dot matrix are arranged on the surface of the piezoelectric film; the surface acoustic wave resonator, the phase-shift network and the radio-frequency amplifier form a surface acoustic wave oscillator together; the surface acoustic wave resonator and the surface acoustic wave detector are arranged in a mutually perpendicular crossing way; the surface of the piezoelectric film at the intersection of the surface acoustic wave resonator and the surface acoustic wave detector forms a blank; and the metal dot matrix is positioned at the blank. The gyro has the advantages of simple and compact structure, low cost, easy and simple operation and the like, can adjust the working frequency of the surface acoustic wave gyro in a certain range, can realize matching of the working frequency of the oscillator and the working frequency of the detector, and effectively improves the sensitivity and accuracy of the surface acoustic wave gyro.