CN219574388U

CN219574388U - Multi-channel detection acquisition device of scintillator neutron detector

Info

Publication number: CN219574388U
Application number: CN202320269676.5U
Authority: CN
Inventors: 夏广新; 夏庆中; 何铁; 丁阁; 吴玉清
Original assignee: Chengdu Science and Technology Development Center of CAEP
Current assignee: Chengdu Science and Technology Development Center of CAEP
Priority date: 2023-02-21
Filing date: 2023-02-21
Publication date: 2023-08-22
Anticipated expiration: 2033-02-21

Abstract

The utility model discloses a multi-channel detection acquisition device of a scintillator neutron detector, which comprises: the multichannel analog conditioning circuit receives analog acquisition signals of the scintillators; the multi-channel ADC conversion circuit is connected with the output of the multi-channel analog conditioning circuit in parallel and is used for ADC conversion; the FPGA multichannel data acquisition unit receives output signals of the multichannel ADC conversion circuit and performs digital signal processing; and the central control circuit receives the data signals of the FPGA multichannel data acquisition unit and outputs digital acquisition signals outwards. The utility model adopts a multipath digital acquisition and analysis technology, matches the analog acquisition signal readout of the front-end scintillator, realizes the digital acquisition and analysis processing of neutron signals with high precision, small volume and low power consumption, and is suitable for the efficient collection of large-area scintillation light.

Description

Multi-channel detection acquisition device of scintillator neutron detector

Technical Field

The utility model belongs to the technical field of detectors, and particularly relates to a multi-channel detection acquisition device of a scintillator neutron detector.

Background

One important application of neutron detectors is neutron dose measurement, which is an important aspect of environmental monitoring and radiation protection. Particularly, neutron radiation exists in the places such as a reactor, related nuclear facilities, an accelerator, a neutron source and the like, and the neutron dose monitoring of individuals in the workplace has become an important content of radiation protection and occupational health management. Neutron dose measurement helps control individual and collective dose levels while preventing radioactive contamination of facilities and personnel, loss of control of radioactive material, spread of radioactive contamination, and prevention of radiation accidents.

The common thermal neutron detectors are of three types, gas, scintillator and semiconductor detectors. The existing detector acquisition equipment is mainly used for directly acquiring signals by adopting a single channel, and converting the electrical signals, so that the efficiency is low, and the detector acquisition equipment cannot be suitable for efficiently collecting large-area scintillation light.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model aims to provide a multi-channel detection acquisition device of a scintillator neutron detector, which adopts a multi-channel digital acquisition analysis technology to match the analog acquisition signal readout of a front-end scintillator, realizes the digital acquisition analysis processing of neutron signals with high precision, small volume and low power consumption, and is suitable for the efficient collection of large-area scintillation light.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a multi-channel detection acquisition device for a scintillator neutron detector, comprising:

the multichannel analog conditioning circuit receives analog acquisition signals of the scintillators;

the multi-channel ADC conversion circuit is connected with the output of the multi-channel analog conditioning circuit in parallel and is used for ADC conversion;

the FPGA multichannel data acquisition unit receives output signals of the multichannel ADC conversion circuit and performs digital signal processing;

and the central control circuit receives the data signals of the FPGA multichannel data acquisition unit and outputs digital acquisition signals outwards.

Furthermore, the multipath analog conditioning circuit adopts a plurality of analog conditioning devices, and the analog conditioning devices are mutually independent and are parallel to form the multipath analog conditioning circuit.

Further, the analog conditioning device comprises a high input impedance operational amplifier, a program-controlled adjustable differential circuit, a program-controlled range switching circuit, an analog switch and an operational amplifier component, wherein the high input impedance operational amplifier, the program-controlled adjustable differential circuit, the program-controlled range switching circuit, the analog switch and the operational amplifier component are sequentially connected step by step.

Furthermore, the multi-channel ADC conversion circuit adopts a plurality of ADC devices, and the ADC devices are mutually independent and are arranged in parallel to form the multi-channel ADC conversion circuit.

Furthermore, the multi-channel ADC conversion circuit adopts a high-speed ADC synchronous acquisition clock circuit, and performs signal conversion of a plurality of ADC devices in synchronous acquisition.

The beneficial effect of adopting this technical scheme is:

when the signal is processed by adopting the multipath detection acquisition device, the utility model is suitable for the efficient collection of large-area scintillation light, can realize the digital processing of neutron detection, and has more stable and higher-precision measurement results; meanwhile, the volume of the read-out electronics can be greatly reduced, and the portable electronic device has obvious advantages in the use aspect of portable instruments and meters; the fault tolerance of the neutron detection system is improved, and when one or more paths of the neutron detection system are in a problem, other paths of the neutron detection system can still be measured normally to obtain results.

Drawings

FIG. 1 is a schematic diagram of the circuit connections of a multi-channel detection acquisition device of a scintillator neutron detector of the present utility model.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings for the purpose of making the objects, technical solutions and advantages of the present utility model more apparent.

In this embodiment, referring to fig. 1, a multi-channel detection and acquisition device of a scintillator neutron detector includes:

As an optimization scheme of the embodiment, the multi-channel analog conditioning circuit adopts a plurality of analog conditioning devices, and the analog conditioning devices are mutually independent and are arranged in parallel to form the multi-channel analog conditioning circuit.

As an optimization scheme of the embodiment, the analog conditioning device comprises a high input impedance operational amplifier, a program-controlled adjustable differential circuit, a program-controlled range switching circuit, an analog switch and an operational amplifier component, wherein the high input impedance operational amplifier, the program-controlled adjustable differential circuit, the program-controlled range switching circuit, the analog switch and the operational amplifier component are sequentially connected step by step.

a. And a high input impedance operational amplifier is adopted to ensure that an input signal is not distorted.

The first stage adopts a high input impedance operational amplifier to ensure that an input signal is not distorted;

b. the second stage adopts a program-controlled adjustable differential circuit, so that the forming width can be dynamically modified, and the requirements of resolution and counting rate of different requirements are matched;

c. the third stage adopts a program-controlled range switching circuit, so that different energy measuring ranges can be matched;

d. and the fourth stage adopts the cooperation of an analog switch and an operational amplifier to realize the inversion of the numerical control signal and match the detector signals with different polarities.

As an optimization scheme of the above embodiment, the multi-channel ADC conversion circuit adopts a plurality of ADC devices, and each ADC device is independent and parallel to form the multi-channel ADC conversion circuit.

The multi-channel ADC conversion circuit adopts a high-speed ADC synchronous acquisition clock circuit, and performs signal conversion of a plurality of ADC devices in synchronous acquisition.

For a better understanding of the present utility model, the following is a complete description of the principles of the utility model:

receiving analog acquisition signals of the scintillators in parallel by utilizing a multipath analog conditioning circuit, and conditioning the acquisition signals; then, the multichannel ADC conversion circuit is used for respectively carrying out analog-to-digital conversion on the multichannel signals conditioned by the multichannel analog conditioning circuit to obtain multichannel digital signals; the multi-channel digital signals are input into an FPGA multi-channel data acquisition unit together, and the FPGA multi-channel data acquisition unit is used for processing to obtain final integrated acquisition signals, and the final integrated acquisition signals are output by a central control circuit.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A multi-channel detection acquisition device for a scintillator neutron detector, comprising:

2. The apparatus of claim 1, wherein the multi-channel analog conditioning circuit comprises a plurality of analog conditioning devices, each of the analog conditioning devices being independent of the other and arranged in parallel to form the multi-channel analog conditioning circuit.

3. The multi-channel detection and acquisition device of a scintillator neutron detector according to claim 2, wherein the analog conditioning device comprises a high input impedance operational amplifier, a programmable adjustable differential circuit, a programmable range switching circuit, an analog switch and an operational amplifier component, and the high input impedance operational amplifier, the programmable adjustable differential circuit, the programmable range switching circuit, the analog switch and the operational amplifier component are sequentially connected step by step.

4. The apparatus of claim 1, wherein the multi-channel ADC conversion circuit comprises a plurality of ADC devices, each of the ADC devices being independent of each other and arranged in parallel.

5. The multi-channel detection and acquisition device of the scintillator neutron detector according to claim 4, wherein the multi-channel ADC conversion circuit adopts a high-speed ADC synchronous acquisition clock circuit and performs signal conversion of a plurality of ADC devices in synchronous acquisition.