Method and measuring arrangement for measuring gas content of fluid
First Claim
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1. A method for measuring the gas content of a fluid, which has gas bubbles, in which method microwave radiation is transmitted through the fluid, the method comprising the steps of:
- measuring at least one variable of the microwave radiation after the radiation has propagated through the fluid, and determining the gas content of the fluid on the basis of noise caused by gas bubbles in the variable of the microwave radiation.
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Abstract
The invention relates to a method and a measuring arrangement for measuring the gas content of a fluid (13). The fluid (13) comprises gas bubbles. In the method, microwave radiation (20) is transmitted through the fluid (13) and a signal (7) indicating the travel time, phase or amplitude of the radiation (20) is formed in a microwave measuring device (16), and a gas measuring equipment (18) determines the gas content of the fluid (13) by means of the signal (7).
60 Citations
25 Claims
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1. A method for measuring the gas content of a fluid, which has gas bubbles, in which method microwave radiation is transmitted through the fluid, the method comprising the steps of:
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measuring at least one variable of the microwave radiation after the radiation has propagated through the fluid, and determining the gas content of the fluid on the basis of noise caused by gas bubbles in the variable of the microwave radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
forming the measured variable of the microwave radiation into a measurement signal;
converting the measurement signal from the time domain into the transform domain;
forming a value that is characteristic of the transformed signal; and
forming the gas content of the fluid by means of the value characteristic of the transformed signal.
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11. A method according to claim 10, wherein the characteristic value is one of the greatest value, effective value, and area of the signal.
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12. A method according to claim 1, wherein the consistency of the fluid is also measured, the result of the consistency measurement is corrected according to the result of the gas content measurement.
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13. A method according to claim 1, wherein the fluid in the method is papermaking pulp, and the method is applied in the measurement for air content which is about 0.1% or more of the total volume of the pulp.
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14. A measuring arrangement for measuring the gas content of a fluid, which has gas bubbles, the measuring arrangement being arranged to transmit microwave radiation through the fluid, and comprising a transmitting antenna, a receiving antenna and a microwave measuring device, which are arranged to measure at least one variable of the microwave signal as the signal travels through the fluid, wherein
the measuring arrangement comprises a gas measuring equipment for determining the gas content of the fluid on the basis of noise caused by the gas bubbles in the variable of the microwave signal.
Specification