Did You Know...
...that it was melting ice cream that inspired the invention of the outboard motor? It was a lovely August day and Ole Evinrude was rowing his boat to his favorite island picnic spot. As he rowed, he watched his ice cream melt and wished he had a faster way to get to the island. At that moment the idea for the outboard motor was born!
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| Number | Title | Issue Date |
| 7139220 | Dynamic filter tuning for pulse-echo ranging systems Dynamic tuning of a tunable filter within the receiver of a pulse-echo ranging system. A filter tuning module compares a transmit signal and a filtered signal to obtain a phase difference indicative of any mis-match between the resonant frequency of the tunable filt... | 11/21/2006 |
| 7054227 | Method for recursive echo processing in time-of-flight or level measurement systems A method for processing echoes in a time-of-flight ranging system or level measurement system. The method comprises a recursive descent parser which is applied to an echo profile to process and identify potential echoes. In another aspect, the method provides for pr... | 05/30/2006 |
| 7010973 | Method and apparatus for improving accuracy in ultrasonic echo ranging systems A method and apparatus for calibrating and/or improving the accuracy of time of flight ranging or level measurement systems. A correction factor is determined and applied to the calculated receive times for echo pulses in response to a change in the amplitude of the... | 03/14/2006 |
| 7009577 | Mounting mechanism for securing an antenna in a level measurement device A mounting mechanism for detachably coupling an antenna to a level measurement device. The mounting mechanism is coupled to the housing of the level measurement device and comprises an outer ring and an inner ring. The inner ring has a centred opening for receiving ... | 03/07/2006 |
| 6961665 | Power management mechanism for loop powered time of flight and level measurement systems A loop powered level measurement and time of flight ranging system with power management. The level measurement system includes a controller, a transducer for distance ranging, a power supply, and a power management stage. The power management stage comprises a shun... | 11/01/2005 |
| 6935177 | Method for an entropy filter echo processing in time-of-flight or level measurement systems A method for processing echoes in a time-of-flight ranging system or level measurement system. The method comprises applying an entropy filter to the echo profile. The entropy filter comprises determining the information content in the echo profile. The entropy filt... | 08/30/2005 |
| 6911935 | Field interchangeable level measurement system A microwave-based level measurement system having a planar microwave antenna configuration. According to another aspect, the microwave-based level measurement devices are field interchangeable with ultrasonic based level measurement devices. ... | 06/28/2005 |
| 6898151 | Acoustic pulse echo ranging system A method of operating a pulse echo ranging system comprising a transducer assembly for providing transmission and reception of high frequency energy pulses at substantially different plural frequencies. The method uses signals received by the transducer assembly to ... | 05/24/2005 |
| 6885611 | Method for high-pass filtering for echo processing in time of flight ranging systems A method and system for high-pass filtering to remove DC and/or low frequency components of a receive signal from the transducer of a level measurement system. In one embodiment, the method includes generating a maximum signal profile and a minimum signal profile fo... | 04/26/2005 |
| 6870417 | Circuit for loss-less diode equivalent A loss-less diode equivalent circuit which functions to reduce and eliminate the forward bias voltage or drop associated with conventional diodes. The loss-less diode comprises a reverse connected MOSFET device which is configured with a clamping circuit and coupled... | 03/22/2005 |
| 6864833 | Time-base generator with self-compensating control loop A time-base generator with a self-compensating control loop. The time-base generator is suitable for use in level measurement and time-of-flight ranging systems. The time-base generator includes a pulse generator stage, a delay stage, a control loop and a references... | 03/08/2005 |
| 6856576 | Method for determining echo distance using autocorrelation in time of flight ranging systems A method and system for echo processing a receive signal using autocorrelation. A receive signal is sampled, digitized and high-pass filtered. A correlation signal is created by adding the filtered signal to a copy of the filtered signal shifted by a time unit. A se... | 02/15/2005 |
| 6816436 | Method for echo processing in time-of-flight or level measurement systems A method for processing echoes in a time-of-flight ranging system or level measurement system. The method comprises an initial noise floor level and identifying potential echoes in an echo signal above the initial noise floor level and a noise signal below the initi... | 11/09/2004 |
| 6597309 | Microwave pulse generator and pulse-echo ranging system A pulse-echo ranging system is described employing a microwave transducer head (100) providing an echo profile output signal which is largely compatible with receivers (204) and echo processing systems (206) designed for acoustic transducers. The transduc... | 07/22/2003 |
| 6590379 | Apparatus for detecting the envelope of an input signal An envelope detector for detecting the envelope of an input signal. The envelope detector includes an inverter for inverting the input signal and two offsetting circuits for offsetting the input signal and the inverted input signal so as to align the peak... | 07/08/2003 |
| 6298008 | Pulse-echo system for mediums having varying densities A method of measuring the position of a target feature in a pulse-echo ranging system including transmitting at least one pulse of high frequency energy from a transducer towards the target feature, receiving energy reflected back from the direction of th... | 10/02/2001 |
