Low power signal processing and measurement apparatus
First Claim
1. An apparatus for measuring flow velocity of a fluid or gas medium by measuring a transit time of an ultrasonic transmission signal through the fluid or gas medium both with and against the flow of said fluid or gas medium, the apparatus comprising:
- a first transmission means for providing a first ultrasonic transmission signal for injection into said fluid or gas medium in the direction of the flow at a predetermined time;
a first reception means, displaced from said first transmission means, for receiving a first ultrasonic received analog signal from said fluid or gas medium;
a second transmission means for providing a second ultrasonic transmission signal for injection into said fluid or gas medium in the direction against the flow at a predetermined time;
a second reception means, displaced from said second transmission means, for receiving a second ultrasonic received analog signal from said fluid or gas medium;
means, coupled to both said first and second reception means, for correlating said first and second ultrasonic received analog signals with said first and second ultrasonic transmission signals, respectively, such that peak intervals of the correlation of both said first and second ultrasonic received analog signals are extracted;
an analog-to-digital converter, coupled to said means for correlating, for digitizing said peak intervals; and
a processor means, coupled to said analog-to-digital converter, for calculating from said digitized peak intervals the transit time of said fluid or gas medium.
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Accused Products
Abstract
A low power apparatus for measuring various process parameters and/or physical properties of a fluid or gas medium by measuring the change of a wave signal or time dependent signal as it traverses the fluid or gas medium, the apparatus comprising: at least one transmission transducer for providing a transmitted wave or time dependent signal for injection into the fluid or gas medium; at least one reception transducer, displaced from the transmission transducer for receiving a received wave or time dependent signal from the fluid or gas medium; and an analog signal processor, coupled to the reception transducer, for processing of the received wave or time dependent signal such that a short interval of the processed received wave or time dependent signal is extracted.
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Citations
17 Claims
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1. An apparatus for measuring flow velocity of a fluid or gas medium by measuring a transit time of an ultrasonic transmission signal through the fluid or gas medium both with and against the flow of said fluid or gas medium, the apparatus comprising:
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a first transmission means for providing a first ultrasonic transmission signal for injection into said fluid or gas medium in the direction of the flow at a predetermined time; a first reception means, displaced from said first transmission means, for receiving a first ultrasonic received analog signal from said fluid or gas medium; a second transmission means for providing a second ultrasonic transmission signal for injection into said fluid or gas medium in the direction against the flow at a predetermined time; a second reception means, displaced from said second transmission means, for receiving a second ultrasonic received analog signal from said fluid or gas medium; means, coupled to both said first and second reception means, for correlating said first and second ultrasonic received analog signals with said first and second ultrasonic transmission signals, respectively, such that peak intervals of the correlation of both said first and second ultrasonic received analog signals are extracted; an analog-to-digital converter, coupled to said means for correlating, for digitizing said peak intervals; and a processor means, coupled to said analog-to-digital converter, for calculating from said digitized peak intervals the transit time of said fluid or gas medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification