Explosion-proof sodium iodide detector circuit and detection method

Abstract

The invention provides an explosion-proof sodium iodide detector circuit, which comprises a front-end processing unit and an in-situ radiation processing unit, and is characterized in that the front-end processing unit communicates with the in-situ radiation processing unit through an RS485 / RS232 interface; the in-situ radiation processing unit comprises a main control display panel, a communication interface board and an analog quantity interface board, the main control display panel performs interface conversion through the communication interface board, performs analog quantity interface board processing on the received monitoring data of the front-end processing unit, displays the processed data on a screen, and records and stores the received data on a memory; the analog quantity interface board converts an acquired voltage value into a corresponding input current value by acquiring data of an ADC according to a preset conversion relation of the main control display board, and multi-channel fault alarm and multi-channel fault judgment are realized.

Description

Technical Field

[0001] The invention relates to the field of detectors, in particular to an explosion-proof sodium iodide detector circuit and a detection method. Background Art

[0002] The explosion-proof sodium iodide detector converts the γ photon radiation signal emitted from the gas in the measured pipeline into an electrical signal and outputs it to the electronic component. The electronic component amplifies, processes and converts the received electrical signal into a digital signal. Finally, the device determines the monitoring value in real time. When the monitoring value exceeds the alarm threshold set by the user, the alarm is triggered, and the sound and light alarm signal is issued in time. At the same time, the alarm status is uploaded through the communication interface and the switch signal. When the monitoring value drops to within the threshold set by the user, the device can release the alarm and resume normal working state. When the device or detector fails, a fault alarm signal is issued, and the device fault status is uploaded through the communication interface.

[0003] However, the current detector data collection and processing is a one-to-one relationship, with low processing efficiency, and cannot respond quickly. It is also impossible to determine the equipment operation monitoring information and perform multi-channel fault alarms. Summary of the invention

[0004] The present invention aims at the deficiencies in the background technology and provides an explosion-proof sodium iodide detector circuit and a detection method, which realizes multi-channel fault alarm and multi-channel fault judgment.

[0005] The objective of the present invention is achieved through the following technical measures: an explosion-proof sodium iodide detector circuit, comprising a front-end processing unit and an on-site radiation processing unit, wherein the front-end processing unit communicates with the on-site radiation processing unit through an RS485 / RS232 interface; the on-site radiation processing unit comprises a main control display board, a communication interface board and an analog interface board, wherein the main control display board converts the received monitoring data of the front-end processing unit through the communication interface board interface, processes the received monitoring data of the front-end processing unit through the analog interface board and displays the data on the screen, and records and stores the received data in a memory at the same time; the analog interface board converts the collected voltage value into the corresponding input current value according to the conversion relationship preset by the main control display board by collecting ADC data.

[0006] Preferably, the front-end processing unit includes a preamplifier board, a multi-channel, and an ARM data processing board. The signal passes through the preamplifier board and directly enters the multi-channel for collection. The multi-channel and the ARM data processing board are arranged on different circuit boards to form a front-end processing unit.

[0007] Preferably, the on-site radiation processing unit further specifically includes: an ARM main processor, a display screen, an input keyboard, an RS485 port, and an I / O port; the display screen displays the measurement data in the format set by the ARM main processor, the input keyboard inputs corresponding information, the RS485 port transmits or receives data sent by the front-end processing unit, and the I / O port receives measured data, outputs alarms or switch control signals.

[0008] Preferably, the analog output circuit of the analog interface board converts the voltage value output by the DAC into a current source value.

[0009] Preferably, the DAC output voltage and the analog output conversion circuit are in a linear relationship, and the voltage value output by the DAC and the corresponding physical quantity adopt the following logarithmic conversion relationship:

[0010]

[0011] V: DAC preset voltage value,

[0012] B0: the magnitude from the minimum to the maximum value of the physical quantity to be converted,

[0013] A0: lower limit of the physical quantity to be converted,

[0014] A: Current physical quantity output value, corresponding to the current measurement value of the detector.

[0015] Also provided is a method for using the above-mentioned explosion-proof sodium iodide detector circuit to perform multi-channel fault alarm by determining equipment operation monitoring information.

[0016] Beneficial effects of the present invention: The local radiation processing unit performs multi-channel fault determination by determining the equipment operation monitoring information. The fault determination includes the following contents: whether the detector communication is normal, whether the host computer communication is normal, whether the SD is inserted, whether the total γ activity concentration exceeds the upper limit, whether the analog output is normal, etc.

[0017] The analog output circuit can arbitrarily set the physical quantity corresponding to the current channel, and unused output channels can be disabled (to avoid unused channels being judged as analog output failures), with strong resistance to external interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the explosion-proof sodium iodide detector circuit of the present invention;

[0019] Figure 2 It is a schematic diagram of the composition of the front-end processing unit of the present invention;

[0020] Figure 3 A schematic diagram of the composition of an embodiment of an on-site radiation treatment unit of the present invention; DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, an explosion-proof sodium iodide detector circuit is characterized in that it includes a front-end processing unit and an on-site radiation processing unit, and the front-end processing unit communicates with the on-site radiation processing unit through an RS485 / RS232 interface; the on-site radiation processing unit includes a main control display board, a communication interface board and an analog interface board, and the main control display board converts the received monitoring data of the front-end processing unit through the communication interface board interface, and displays it on the screen after being processed by the analog interface board, and records and stores the received data in the memory at the same time; the analog interface board converts the collected voltage value into the corresponding input current value according to the conversion relationship preset by the main control display board by collecting ADC data.

[0023] like Figure 2 As shown, the front-end processing unit includes a preamplifier board, a multi-channel, and an ARM data processing board. The signal passes through the preamplifier board and directly enters the multi-channel for collection. The multi-channel and the ARM data processing board are arranged on different circuit boards to form a front-end processing unit.

[0024] like Figure 3 As shown, the on-site radiation processing unit further specifically includes: an ARM main processor, a display screen, an input keyboard, an RS485 port, and an I / O port; the display screen displays the measurement data in the format set by the ARM main processor, the input keyboard inputs the corresponding information, the RS485 port transmits or receives the data sent by the front-end processing unit, and the I / O port receives the measured data, outputs an alarm or a switch control signal.

[0025] When working: The analog input circuit of the local radiation processing unit collects ADC data and converts the collected voltage value into the corresponding input current value according to the conversion relationship preset in the hardware design. There is a corresponding relationship between the physical quantity measured by the external sensor and the output current value. The current value can be restored to the physical quantity through the conversion relationship of the external sensor. The circuits of different analog inputs are consistent, and the corresponding conversion relationship between the input current and the ADC collected voltage value is consistent. Only the settable physical quantity and current value conversion relationship coefficient is reserved. The variable coefficient is set according to the first-order linear formula by default, and the analog variable coefficient can be set independently.

[0026] The analog output circuit can convert the voltage value output by the DAC into a corresponding current source. The DAC output voltage and the analog output conversion circuit have a linear relationship, and the conversion relationship is determined by the hardware circuit.

[0027] The voltage value output by the DAC and the corresponding physical quantity use the following logarithmic conversion relationship:

[0028]

[0029] V: DAC preset voltage value

[0030] B0: The magnitude from the minimum to the maximum value of the physical quantity to be converted (debugging parameters can be set)

[0031] A0: Lower limit of the physical quantity to be converted (debugging parameters can be set)

[0032] A: Current physical quantity output value, corresponding to the current measurement value of the detector (real-time value)

[0033] The analog output circuit can arbitrarily set the physical quantity corresponding to the current channel, and unused output channels can be disabled (to avoid unused channels being judged as analog output failures).

[0034] The local radiation processing unit reads the detector monitoring data and compares it with the set alarm threshold to determine whether the current alarm status is alarm triggered or alarm released. The local radiation processing unit analog interface board determines the equipment operation monitoring information through analog input and output circuits and performs multi-channel fault judgment. Fault judgment includes the following: whether the detector communication is normal, whether the host computer communication is normal, whether the SD is inserted, whether the total γ activity concentration exceeds the upper limit, whether the analog output is normal, etc.

Claims

1. An explosion-proof sodium iodide detector circuit, characterized in that: It includes a front-end processing unit and an on-site radiation processing unit. The front-end processing unit communicates with the on-site radiation processing unit via an RS485 / RS232 interface. The on-site radiation processing unit includes a main control display board, a communication interface board and an analog interface board. The main control display board converts the received monitoring data of the front-end processing unit through the communication interface board interface, processes the received monitoring data through the analog interface board and displays it on the screen, and records and stores the received data in a memory at the same time. The analog interface board converts the collected voltage value into the corresponding input current value according to the conversion relationship preset by the main control display board by collecting ADC data.

2. An explosion-proof sodium iodide detector circuit according to claim 1, characterized in that: The front-end processing unit includes a preamplifier board, a multi-channel, and an ARM data processing board. The signal directly enters the multi-channel for collection through the preamplifier board. The multi-channel and the ARM data processing board are arranged on different circuit boards to form a front-end processing unit.

3. The explosion-proof sodium iodide detector circuit according to claim 1, characterized in that: The on-site radiation processing unit also specifically includes: an ARM main processor, a display screen, an input keyboard, an RS485 port, and an I / O port; the display screen displays the measurement data in the format set by the ARM main processor, the input keyboard inputs corresponding information, the RS485 port transmits or receives data sent by the front-end processing unit, and the I / O port receives the measured data, outputs an alarm or a switch control signal.

4. The explosion-proof sodium iodide detector circuit according to claim 1, characterized in that: The analog output circuit of the analog interface board converts the voltage value output by the DAC into a current source value.

5. An explosion-proof sodium iodide detector circuit according to claim 4, characterized in that: The DAC output voltage and the analog output conversion circuit are in a linear relationship, and the voltage value of the DAC output and the corresponding physical quantity adopt the following logarithmic conversion relationship: V: DAC preset voltage value, B0: the magnitude from the minimum to the maximum value of the physical quantity to be converted, A0: lower limit of the physical quantity to be converted, A: Current physical quantity output value, corresponding to the current measurement value of the detector.

6. A detection method for an explosion-proof sodium iodide detector, characterized in that: The explosion-proof sodium iodide detector circuit described in any one of claims 1 to 5 is used to perform multi-channel fault alarm by determining equipment operation monitoring information.

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