Method for measuring in a fluid with the aid of sing-around technique
First Claim
1. A method for measuring in a fluid with the aid of a sing-around technique, according to which a transmitter repeatedly transmits sound pulses comprising at least two sound periods in the fluid, and these sound pulses are received by a receiver, which acoustically is disposed opposite to the transmitter, the detection of the reception by the receiver triggering the transmission of a subsequent sound pulse by the transmitter, wherein, at the time of each or every second reception of a sound pulse, a delay is produced, and the transmission of the subsequent sound pulse by the transmitter is triggered with this delay, the delay avoiding interference between a directly received sound pulse and a multiple-reflected sound pulse and the delay equaling at least half the length of the multiple-reflected sound pulse, wherein the delay between reception of the sound pulse and transmission of the subsequent sound pulse is established as a function of the frequency of the received sound pulse.
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Accused Products
Abstract
During sing-around-type measurement in a fluid, a transmitter repeatedly transmits sound pulses in the fluid, and these sound pulses are received by a receiver, which acoustically is disposed opposite to the transmitter. The detection of the reception of a sound pulse at the receiver triggers the transmission of a subsequent sound pulse by the transmitter. In order to avoid any interference from multiple-reflected sound pulses, a delay is produced with the aid of the frequency of the received sound pulse, and the transmission of the subsequent sound pulse by the transmitter is triggered with this delay.
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Citations
25 Claims
- 1. A method for measuring in a fluid with the aid of a sing-around technique, according to which a transmitter repeatedly transmits sound pulses comprising at least two sound periods in the fluid, and these sound pulses are received by a receiver, which acoustically is disposed opposite to the transmitter, the detection of the reception by the receiver triggering the transmission of a subsequent sound pulse by the transmitter, wherein, at the time of each or every second reception of a sound pulse, a delay is produced, and the transmission of the subsequent sound pulse by the transmitter is triggered with this delay, the delay avoiding interference between a directly received sound pulse and a multiple-reflected sound pulse and the delay equaling at least half the length of the multiple-reflected sound pulse, wherein the delay between reception of the sound pulse and transmission of the subsequent sound pulse is established as a function of the frequency of the received sound pulse.
- 7. A method for measuring in a fluid with the aid of a sing-around technique, according to which a transmitter repeatedly transmits sound pulses comprising at least two sound periods in the fluid, and these sound pulses are received by a receiver, which acoustically is disposed opposite to the transmitter, the detection of the reception by the receiver triggering the transmission of a subsequent sound pulse by the transmitter, wherein, at the time of each or every second reception of a sound pulse, a delay is produced with the aid of the frequency of the received sound pulse, and the transmission of the subsequent sound pulse by the transmitter is triggered with this delay, the delay avoiding interference between a directly received sound pulse and a multiple-reflected sound pulse and the delay equaling at least half the length of the multiple-reflected sound pulse, wherein the time elapsing between the reception of a multiple-reflected sound pulse and the reception of a directly received sound pulse is measured.
- 12. In a measuring instrument of sing-around type comprising a transmitter, which is adapted to repeatedly transmit sound pulses comprising at least two sound periods in a fluid, and a receiver, which is adapted to acoustically be disposed opposite to the transmitter and to receive the sound pulses transmitted by the transmitter, said device comprising reception-detecting means for detecting the reception of a sound pulse by the receiver, and exciting means which are adapted, in response to the detection by the reception-detecting means of the reception of a sound pulse, to excite the transmitter to transmit a sound pulse, a device comprising delay means which are adapted to produce a delay, so as to cause the excitation of the transmitter by the exciting means to be delayed with this delay, the delay avoiding interference between a directly received sound pulse and a multiple-reflected sound pulse and the delay equaling at least half the length of the multiple-reflected sound pulse, wherein the delay between reception of the sound pulse and transmission of the subsequent sound pulse is established as a function of the frequency of the received sound pulse.
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15. In a measuring instrument of sing-around type comprising a transmitter, which is adapted to repeatedly transmit sound pulses comprising at least two sound periods in a fluid, and a receiver, which is adapted to acoustically be disposed opposite to the transmitter and to receive the sound pulses transmitted by the transmitter, said device comprising reception-detecting means for detecting the reception of a sound pulse by the receiver, and exciting means which are adapted, in response to the detection by the reception-detecting means of the reception of a sound pulse, to excite the transmitter to transmit a sound pulse, a device comprising delay means which are adapted to produce a delay with the aid of the frequency of the received sound pulse, so as to cause the excitation of the transmitter by the exciting means to be delayed with this delay, the delay avoiding interference between a directly received sound pulse and a multiple-reflected sound pulse and the delay equaling at least half the length of the multiple-reflected sound pulse, wherein time meters are adapted to measure the time elapsing between the reception of a multiple-reflected sound pulse and the reception of a directly received sound pulse.
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16. In a measuring instrument of sing-around type comprising a transmitter, which is adapted to repeatedly transmit sound pulses comprising at least two sound periods in a fluid, and a receiver, which is adapted to acoustically be disposed opposite to the transmitter and to receive the sound pulses transmitted by the transmitter, said device comprising reception-detecting means for detecting the reception of a sound pulse by the receiver, and exciting means which are adapted, in response to the detection by the reception-detecting means of the reception of a sound pulse, to excite the transmitter to transmit a sound pulse, a device comprising delay means which are adapted to produce a delay with the aid of the frequency of the received sound pulse, so as to cause the excitation of the transmitter by the exciting means to be delayed with this delay, the delay avoiding interference between a directly received sound pulse and a multiple-reflected sound pulse and the delay equaling at least half the length of the multiple-reflected sound pulse, wherein the delay means comprises a counter, wherein time meters are adapted to measure the time elapsing between the reception of a multiple-reflected sound pulse and the reception of a directly received sound pulse, the directly received sound pulse being part of a sound pulse transmitted by the transmitter and directly received by the receiver, and the multiple-reflected sound pulse being part of a sound pulse transmitted by the transmitter and reflected first at the receiver and then at the transmitter and thereafter received by the receiver.
- 17. In a measuring instrument of sing-around type comprising a transmitter, which is adapted to repeatedly transmit sound pulses comprising at least two sound periods in a fluid, and a receiver, which is adapted to acoustically be disposed opposite to the transmitter and to receive the sound pulses transmitted by the transmitter, said device comprising reception-detecting means for detecting the reception of a sound pulse by the receiver, and exciting means which are adapted, in response to the detection by the reception-detecting means of the reception of a sound pulse, to excite the transmitter to transmit a sound pulse, a device comprising delay means which are adapted to produce a delay with the aid of the frequency of the received sound pulse, so as to cause the excitation of the transmitter by the exciting means to be delayed with this delay, the delay avoiding interference between a directly received sound pulse and a multiple-reflected sound pulse and the delay equaling at least half the length of the multiple-reflected sound pulse, wherein the delay means comprises a counter, wherein zero-crossing-detecting means have one input from the receiver and one output to the counter and are adapted to detect zero crossings in the sound pulses received by the receiver, wherein time meters are adapted to measure the time elapsing between the reception of a multiple-reflected sound pulse and the reception of a directly received sound pulse.
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19. In a measuring instrument of sing-around type comprising a transmitter, which is adapted to repeatedly transmit sound pulses comprising at least two sound periods in a fluid, and a receiver, which is adapted to acoustically be disposed opposite to the transmitter and to receive the sound pulses transmitted by the transmitter, said device comprising reception-detecting means for detecting the reception of a sound pulse by the receiver, and exciting means which are adapted, in response to the detection by the reception-detecting means of the reception of a sound pulse, to excite the transmitter to transmit a sound pulse, a device comprising delay means which are adapted to produce a delay with the aid of the frequency of the received sound pulse, so as to cause the excitation of the transmitter by the exciting means to be delayed with this delay, the delay avoiding interference between a directly received sound pulse and a multiple-reflected sound pulse and the delay equaling at least half the length of the multiple-reflected sound pulse, wherein the delay means comprises a counter, wherein zero-crossing-detecting means have one input from the reciever and one output to the counter and are adapted to detect zero crossings in the sound pulses received by the receiver, wherein the reception-detecting means comprises a first comparator having a first input at which a reference signal is received, a secon dinput which is connected to the receiver, and an output which is connected to the zero-crossing-detecting means.
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21. In a measuring instrument of sing-around type comprising a transmitter, which is adapted to repeatedly transmit sound pulses comprising at least two sound periods in a fluid, and a receiver, which is adapted to acoustically be disposed opposite to the transmitter and to receive the sound pulses transmitted by the transmitter, said device comprising reception-detecting means for detecting the reception of a sound pulse by the receiver, and exciting means which are adapted, in response to the detection by the reception-detecting means of the reception of a sound pulse, to excite the transmitter to transmit a sound pulse, a device comprising delay means which are adapted to produce a delay with the aid of the frequency of the received sound pulse, so as to cause the excitation of the transmitter by the exciting means to be delayed with this delay, the delay avoiding interference between a directly received sound pulse and a multiple-reflected sound pulse and the delay equaling at least half the length of the multiple-reflected sound pulse, wherein the delay means comprises a phase detector.
- 22. A measuring instrument of a sing-around type comprising a transmitter, which is adapted to repeatedly transmit sound pulses comprising at least two sound periods in a fluid, and a receiver, which is adapted to acoustically be disposed opposite to the transmitter and to receive the sound pulses transmitted by the transmitter, wherein the measuring instrument comprises delay means which are adapted to produce a delay, so as to cause the excitation of the transmitter by the exciting means to be delayed with this delay, the delay avoiding interference between a directly received sound pulse and a multiple-reflected sound pulse and the delay equaling at least half the length of the multiple-reflected sound pulse, wherein the delay between reception of the sound pulse and transmission of the subsequent sound pulse is established as a function of the frequency of the received sound pulse.
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24. A method for measuring in a fluid with the aid of a sing-around technique, according to which a transmitter repeatedly transmits sound pulses in the fluid, and these sound pulses are received by a receiver, which acoustically is disposed opposite to the transmitter, the detection of the reception by the receiver triggering the transmission of a subsequent sound pulse by the transmitter, wherein, at the time of each or every second reception of a sound pulse, a delay is produced with the aid of the frequency of the received sound pulse, and the transmission of the subsequent sound pulse by the transmitter is triggered with this delay, wherein part of a sound pulse transmitted by the transmitter is received directly by the receiver as a directly received sound pulse, part of said sound pulse is reflected first at the receiver and then at the transmitter and thereafter is received at the receiver as a multiple-reflected sound pulse, and the time elapsing between the reception of a multiple-reflected sound pulse and the reception of a directly received sound pulse is measured.
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25. In a measuring instrument of sing-around type comprising a transmitter, which is adapted to repeatedly transmit sound pulses in a fluid, and a receiver, which is adapted to acoustically be disposed opposite to the transmitter and to receive the sound pulses transmitted by the transmitter, said device comprising reception-detecting means for detecting the reception of a sound pulse by the receiver, and exciting means which are adapted, in response to the detection by the reception-detecting means of the reception of a sound pulse, to excite the transmitter to transmit a sound pulse, a device comprising delay means which are adapted to produce a delay with the aid of the frequency of the received sound pulse, so as to cause the excitation of the transmitter by the exciting means to be delayed with this delay, wherein time meters are adapted to measure the time elapsing between the reception of a multiple-reflected sound pulse and the reception of a directly received sound pulse, the directly received sound pulse being part of a sound pulse transmitted by the transmitter and directly received by the receiver, and the multiple-reflected sound pulse being part of a sound pulse transmitted by the transmitter and reflected first at the receiver and then at the transmitter and thereafter received by the receiver.
Specification