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| Number | Title | Issue Date |
| 4524693 | Underwater transducer with depth compensation An underwater transducer in which a ring of piezoelectric ceramic elements vibrates radially in response to an applied voltage. Spacer elements formed of steel are placed between pairs of ceramic elements and used to couple the ring movement to convex dia... | 06/25/1985 |
| 4517665 | Acoustically transparent hydrophone probe An acoustically transparent hydrophone probe consisting of a rigid hoop structure in which is secured an assembly of very thin piezoelectric polymer sheet material, such as polyvinylidene fluoride, with one or more very small central sensitive portions. I... | 05/14/1985 |
| 4517664 | Seismic apparatus A seismic streamer section includes a flexible tube with bulkheads at intervals therealong, end means to make electrical and mechanical connections with adjacent sections, tension lines extending from one end means to the other through the bulkheads, hydr... | 05/14/1985 |
| 4433400 | Acoustically transparent hydrophone probe An acoustically transparent hydrophone probe consisting of a rigid hoop structure in which is secured an assembly of very thin piezoelectric polymer sheet material, such as polyvinylidene fluoride, with one or more very small central sensitive portions. I... | 02/21/1984 |
| 4432080 | Subwavelength monopole underwater sound radiator A compact subwavelength size monopole underwater sound radiator has chararistics to maximize resistive radiation impedance, minimize reactive radiation impedance, facilitate heat dissipation and minimize compensating air usage. This results in improved e... | 02/14/1984 |
| 4409681 | Transducer An electro-mechanical transducer is disclosed in which a piston-like radiating element is driven by fluid pumped from the interior of a flextensional transducer such that the motion of the flextensional transducer shell is transmitted to the radiating ele... | 10/11/1983 |
| 4395908 | Means for adjusting the sensitivity of a crystal detector A twin-transducer seismic detector includes a hollow housing closed at each end by a diaphragm-type transducer. A deformable retaining member is pressed against the perimeter of each transducer. An adjustable force is applied to at least one of the deform... | 08/02/1983 |
| 4384351 | Flextensional transducer A magnetic drive is provided for a flextensional transducer in order to adapt the flextensional transducer for operation at increased ocean depths without the necessity of liquid filling and complex decoupling devices. In one embodiment an electro-magneti... | 05/17/1983 |
| 4373781 | Acoustic to optical pulse code modulating transducer An acoustic to optical pulse code modulating transducer includes a microphone housing. An optical fiber is supported, by suitable means coupled to the housing, at a position displaced from one end of the fiber so that the one end is oriented within the ho... | 02/15/1983 |
| 4336639 | Method of making a seismic apparatus A seismic streamer section includes a flexible tube with bulkheads at intervals therealong, end means to make electrical and mechanical connections with adjacent sections, tension lines extending from one end means to the other through the bulkheads, hydr... | 06/29/1982 |
| 4326155 | Shockwave probe Probe method and means are disclosed for guiding and positioning a robot-actuated tool, such as a gripper or a welding head, through at least one transceiver for generating and sensing focused shockwaves, the probe being associated with the tool for relat... | 04/20/1982 |
| 4287582 | Piezo transducers with mechanical amplification for very low frequencies, and acoustic antennas A new piezoelectric transducer incorporated with a mechanical amplifier is described. The transducer comprises a rigid base plate; two lateral plates whose lower edge is connected to the plate by a thin portion; a stack of piezoelectric elements having al... | 09/01/1981 |
| 4268912 | Directional hydrophone suitable for flush mounting A substantially flat and disc-like shaped sound transducer for sensing sound waves in a fluid transmission medium and having directional and omnidirectional response characteristics to the sound waves. The sound transducer having a circular vibratile plat... | 05/19/1981 |
| 4184093 | Piezoelectric polymer rectangular flexural plate hydrophone A transducer, suitable for sensing acoustic signals underwater, includes a iezoelectric polymer film. The device comprises a rectangular sandwich arrangement with a plastic frame in the center having plastic plates connected on either side and a piezoelect... | 01/15/1980 |
| 4183011 | Ultrasonic cleaning systems Improved ultrasonic cleaning of large surfaces is achieved by modifying conventional transducers of either the cylindrical or piston vibratile type so that the transducer vibratile element is brought in closer proximity to the surface being cleaned. For e... | 01/08/1980 |
| 4051455 | Double flexure disc electro-acoustic transducer Improved low frequency electro-acoustic transducer apparatus of the type employing two piezoelectrically driven flexure discs mounted at the ends of a short cylindrical housing containing an acoustic mismatch fluid, is provided. The piezoelectrically driv... | 09/27/1977 |
| 3983425 | Tuned plate acoustic projector with piezoelectric driver A tuned plate acoustic projector having a tuned plate that has its periph bonded to and supported by a housing. The outer face of the tuned plate is exposed to a fluid medium in which it is desired to generate acoustic waves. One end of a piezoelectric t... | 09/28/1976 |
| 3964014 | Sonic transducer array The present invention relates to a transducer array having a resolution suitable for imaging objects disposed in a liquid medium and illuminated with sonic energy of short wavelength. The array consists of a plurality of piezoelectric transducers sensing ... | 06/15/1976 |
