A controllable multi-channel charge readout device

Abstract

The invention relates to the technical field of a multi-channel charge front-end readout circuit for beam current monitoring, in particular to a controllable multi-channel charge readout device. Its characteristic is that it includes sequentially connected high-speed switches, an integrator with a discharge function, a multiplexer, a control logic circuit, a differential output drive circuit and a data acquisition card, which are used for beam current monitoring of charge in a striped ionization chamber ( Current) signal readout, controllable range, controllable integration time, controllable working mode (continuous readout / intermittent readout), can be used flexibly; each channel contains two (A and B) integrators, they It can work in time-sharing, which improves the signal processing efficiency; adopts a multiplexing circuit to realize serial output of signals, which can effectively reduce the complexity and manufacturing cost of the data acquisition and processing system, and improve the accuracy of the heavy ion cancer treatment system. The circuit has high precision, good linearity, strong flexibility and simple structure.

Description

technical field [0001] The invention relates to the technical field of a multi-channel charge front-end readout circuit for beam current monitoring, in particular to a controllable multi-channel charge readout device. Background technique [0002] With the continuous development of heavy ion cancer treatment technology, in order to achieve better therapeutic effects, the treatment terminal has higher and higher requirements for beam quality. In the heavy ion cancer treatment device, the real-time monitoring and measurement of the spatial distribution of the beam is one of the key parts of the device. The beam of the heavy ion cancer treatment device outputs multi-channel weak charge (current) signals through the striped ionization chamber at the treatment terminal, and then through the multi-channel charge (current) readout circuit to realize real-time monitoring of the spatial distribution of the beam. Under normal circumstances, the charge (current) signal output by the s...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the charge (current) signal output by the striped ionization chamber used for beam current monitoring in the cancer treatment terminal is relatively small, and the number of channels is large. Using the current-voltage real-time conversion circuit of the prior art will result in a large amount of data. The requirements for real-time transmission and processing of data in the latter stage are relatively high, which leads to quite expensive manufacturing costs. Secondly, environmental noise also greatly interferes with the circuit, which affects the accuracy of beam current monitoring.

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