Response resolution of Magnetic flowmeter
1. How to operate Magnetic flowmeter
In order to better understand the relationship between resolution, response time and radioactivity, it is necessary to have a basic understanding of the working principles of Magnetic flowmeter. The Magnetic flowmeter is divided into two parts: the low-intensity isotope, also called the source, is installed on the opposite side of the detector. The light source holder collimates the gamma energy, so it only points at the detector, which uses a scintillation element to convert the gamma radiation into light pulses. The photomultiplier tube in the detector electronics records the number of light pulses, which is called the count rate. Due to the non-uniformity of radioactive decay, the internal electronic equipment will maintain an average count rate in operation, which is used to infer the measurement result and output the value. The flow measurement application engineer will carefully study the construction details of the container, including the size of the container, the wall thickness of the container and the measurement range. Only this information will be used to provide multiple solutions for resolution, response time and radioactivity changes. End-of-life users will need to determine which of these factors is important to them in order to choose an end-of-life solution.
2. Resolution: how clear is your picture
Similar to the resolution of a photo or video, the resolution of a radiometric measurement is the degree to which the operator can "see" the container or pipe. Resolution is accuracy, which can be changed according to measurement requirements. Every application does not need the same resolution. For some applications, it may be important to know the exact height within inches of the entire vessel, but for other applications, the operator may only need to know the height of 25% of the top of the vessel in feet. An increase in accuracy means an increase in response time or an increase in radioactivity, or both.
3. Response time: How long do you need to make a measurement?
The flow measurement uses the running average of the count rate to provide a stable and more accurate measurement. The time used to calculate the running average is the response time. Otherwise, due to the inhomogeneity of the radiation field, even constant measurement values seem to bounce up and down every second. Averaging the counts within 30 seconds, 60 seconds, or even 120 seconds can smooth the measurement, but it will also cause a slight delay between process changes and the response of the detector. Shortening the response time for faster measurements will require reducing the resolution of the measurement or increasing the radioactivity.
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