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4445389 Long wavelength acoustic flowmeter
New Patents
or reflecting sources at areas close to a probe in a range of higher frequencies, and also receives lower level echo signals reflected from weak reflection sources or sources at areas remote from the probe in a range of low frequencies. The echo signal receiver comprises a multiple stage amplifier circuit for receiving the echo signal. Outputs from amplifiers at front stages are delivered via filters having higher frequency bands, and outputs from amplifiers at rear stages are delivered via filters having lower frequency bands. The outputs are passed through the filters and then combined into a single processed echo signal. As an alternative, a video signal derived from an echo signal which has passed through a circuit for varying frequency characteristics is compared with a reference voltage by a comparator, which produces an output that is rounded off by removing high frequency components in a low pass filter. The rounded off signal is fed to a circuit for varying frequency characteristics to control the same to change its frequency ban while the signal is being received. In another embodiment, the echo signal is received through a variable low cut filter having a cutoff frequency which can be increased or reduced dependent on the level of the echo signal.
4445380 SELECTABLE FOCUS SPHERICONE TRANSDUCER IMAGING APPARATUS Perry Kaminski poration
assigned
to Technicare
AND
Cor-
111
4445389 LONG WAVELENGTH ACOUSTIC FLOWMETER James Potzick, Baldwin Robertson assigned The United States of America as represented the Secretary of Commerce
to by
A nonintrusive instrument for measuring the volume flowrate of, and the speed of sound in, an arbitrary fluid in a pipe, tube or duct. The sound speed measured is that of a stationary fluid even though the measurement is made while the fluid may be flowing. These measurements are absolute in that they require no flow calibration, and they are independent of the composition of the fluid and its temperature. For a flowing, approximately perfect gas or gas mixture, given the average molecular weight and ratio of specific heats, the instrument measures the temperature. Also, given an independent measurement of the pressure, it measures the gas density and mass flowrate. The measurement can be made in a high noise level environment even when the temperature varies rapidly over a large range. The instrument uses sound whose wavelength is much longer than the diameter of the pipe, tube or duct. As a result, the temperature and flow measurements are independent of the profiles of those quantities across the pipe profiles.
4446395 SHORT RING DOWN, ULTRASONIC TRANSDUCER SUITABLE FOR MEDICAL APPLICATIONS An ultrasound imaging apparatus and transducer means which produces a converging beam pattern focused along the axis of the transducer with increasing beam concentration towards the furthest point of convergence of the beam pattern.
Andreas Hadjicostis Corporation
assigned
to
A highly efficient piezoelectric suitable for medical applications which exhibits a 40 db ring down
Technicare
transducer is disclosed time of less
or reflecting sources at areas close to a probe in a range of higher frequencies, and also receives lower level echo signals reflected from weak reflection sources or sources at areas remote from the probe in a range of low frequencies. The echo signal receiver comprises a multiple stage amplifier circuit for receiving the echo signal. Outputs from amplifiers at front stages are delivered via filters having higher frequency bands, and outputs from amplifiers at rear stages are delivered via filters having lower frequency bands. The outputs are passed through the filters and then combined into a single processed echo signal. As an alternative, a video signal derived from an echo signal which has passed through a circuit for varying frequency characteristics is compared with a reference voltage by a comparator, which produces an output that is rounded off by removing high frequency components in a low pass filter. The rounded off signal is fed to a circuit for varying frequency characteristics to control the same to change its frequency ban while the signal is being received. In another embodiment, the echo signal is received through a variable low cut filter having a cutoff frequency which can be increased or reduced dependent on the level of the echo signal.
4445380 SELECTABLE FOCUS SPHERICONE TRANSDUCER IMAGING APPARATUS Perry Kaminski poration
assigned
to Technicare
AND
Cor-
111
4445389 LONG WAVELENGTH ACOUSTIC FLOWMETER James Potzick, Baldwin Robertson assigned The United States of America as represented the Secretary of Commerce
to by
A nonintrusive instrument for measuring the volume flowrate of, and the speed of sound in, an arbitrary fluid in a pipe, tube or duct. The sound speed measured is that of a stationary fluid even though the measurement is made while the fluid may be flowing. These measurements are absolute in that they require no flow calibration, and they are independent of the composition of the fluid and its temperature. For a flowing, approximately perfect gas or gas mixture, given the average molecular weight and ratio of specific heats, the instrument measures the temperature. Also, given an independent measurement of the pressure, it measures the gas density and mass flowrate. The measurement can be made in a high noise level environment even when the temperature varies rapidly over a large range. The instrument uses sound whose wavelength is much longer than the diameter of the pipe, tube or duct. As a result, the temperature and flow measurements are independent of the profiles of those quantities across the pipe profiles.
4446395 SHORT RING DOWN, ULTRASONIC TRANSDUCER SUITABLE FOR MEDICAL APPLICATIONS An ultrasound imaging apparatus and transducer means which produces a converging beam pattern focused along the axis of the transducer with increasing beam concentration towards the furthest point of convergence of the beam pattern.
Andreas Hadjicostis Corporation
assigned
to
A highly efficient piezoelectric suitable for medical applications which exhibits a 40 db ring down
Technicare
transducer is disclosed time of less