Method and device for controlling currents of X ray tube

Abstract

The invention relates to a method for controlling currents of an X ray tube and a device for controlling the currents of the X ray tube by implementing the control method. In the method and the device, an analog option switch gates a filament current sampling unit or a tube current sampling unit and feeds back to a gain control unit, so that two closed-loop gain control loops are formed. Time-shared control is performed on the two closed-loop gain control loops, namely time-shared gain control is performed on filament currents and tube currents. Therefore, multiple-loop time-shared control can be performed on the currents of the X ray tube, the filament currents can be rapidly improved into currents required by proximity exposure, and more precise tube currents can be obtained after normal work, so that the X ray tube is practical and convenient and has high stability.

Description

technical field [0001] The invention relates to an X-ray tube current control, in particular to a X-ray tube current control method and an X-ray tube current control device implementing the control method. Background technique [0002] Such as figure 1 As shown, the X-ray tube includes a cathode filament 01, an anode 02 and a vacuum tube 03. After electrification, the cathode filament 01 generates heat to generate thermal electrons. The cathode filament 01 is made of tungsten wire, and the anode 02 (commonly known as the target) is made of high melting point metal ( Tungsten is generally used, and X-ray tubes used for crystal structure analysis can also be made of iron, copper, nickel, etc.), electrons are accelerated by high voltages of tens of thousands of volts to hundreds of thousands of volts, and the electron beam bombards the anode 02 (target), X-rays 04 is emitted from the anode 02 (target). The current heating the cathode filament 01 is called the filament current...

AI Technical Summary

Problems solved by technology

However, compared with the prior art A, a large number of analog circuits have been introduced, thereby reducing the instability of the circuit and increasing the failure rate; compared with the existing digital processor, the calculation accuracy of the analog operation circuit is very low

As a result, the tube current accuracy is not high; the circuit board integration level is low, the failure rate is high, and the reliability is low; the implementation cost is too high

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