Drive techniques for a digital flowmeter
First Claim
1. A control system for a Coriolis flowmeter of the type comprising a flow tube, a driver adapted to vibrate the flow tube, and a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver, the control system comprising:
- a drive signal generator adapted to generate a variable drive signal for controlling operation of the driver, the drive signal generator being adapted to excite motion of the flowtube in a first mode of operation using a drive signal comprising a sequence of synthesized periodic signals having a plurality of different frequencies.
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Accused Products
Abstract
Drive techniques for a digital flowmeter are described. The drive techniques account for delays caused during digital signal processing of sensor signals that correspond to a motion of a flowtube, as well as drive signals that impart motion to the flowtube. Such delays may be caused by a variety of factors, including delays associated with analog/digital conversion of the signals and/or filtering of the signals. The techniques include open-loop techniques and closed-loop techniques, which can be used separately or together during the start-up and operation of the digital flowmeter.
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Citations
20 Claims
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1. A control system for a Coriolis flowmeter of the type comprising a flow tube, a driver adapted to vibrate the flow tube, and a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver, the control system comprising:
a drive signal generator adapted to generate a variable drive signal for controlling operation of the driver, the drive signal generator being adapted to excite motion of the flowtube in a first mode of operation using a drive signal comprising a sequence of synthesized periodic signals having a plurality of different frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A Coriolis flowmeter comprising:
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a flow tube; a driver adapted to vibrate the flow tube; a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver; and a control system comprising a drive signal generator adapted to generate a variable drive signal for controlling operation of the driver, the drive signal generator being adapted to excite motion of the flowtube in a first mode of operation using a drive signal comprising a sequence of synthesized periodic signals having a plurality of different frequencies. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification