Screening module and radiation itinerant detector

Abstract

The invention belongs to the technical field of radiation inspection, and particularly relates to a discrimination module and a radiation inspection instrument. Comprising a first operational amplifier U1, a second operational amplifier U2 and a monostable trigger U3, and an input pulse signal GM-IN is amplified by the first operational amplifier U1 and the second operational amplifier U2 and then is connected with the monostable trigger U3. And the monostable trigger U3 discriminates the amplified input pulse signal GM-IN and then outputs the signal GM-OUT to obtain a signal GM-OUT. The weak pulse signal detection circuit has the beneficial effects that the input pulse signal is shaped and amplified by arranging the first operational amplifier U1 and the second operational amplifier U2, and the shaped and amplified pulse signal is discriminated by the monostable trigger U3 to obtain a corresponding output signal, so that the sensitivity of weak pulse signal detection is improved; and the whole discrimination module circuit is stable in performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of radiation patrol inspection, and particularly relates to a discrimination module and a radiation patrol instrument. Background Art

[0002] The discrimination module in a radiation patrol instrument is used to convert the processed voltage input pulse into a pulse output with an amplitude and width meeting certain standards, and eliminate any input signal below (or above) this level.

[0003] Most of the existing discrimination modules use a pulse amplitude discriminator for discrimination. The principle is that the discriminator is set with a discrimination threshold. When the input pulse signal is lower than the discrimination threshold, the discriminator has no output; when the amplitude of the input pulse signal is higher than the discrimination threshold, the discriminator outputs a signal with a specific amplitude and width.

[0004] However, the existing pulse amplitude discriminator has insufficient sensitivity when discriminating weak pulse signals, which results in inaccurate detection of weak radiation by the radiation patrol instrument. Summary of the Invention

[0005] The purpose of the present invention is to provide a discrimination module and a radiation patrol instrument, which can solve the problem of insufficient sensitivity of the existing pulse amplitude discriminator when discriminating weak pulse signals.

[0006] The technical solution of the present invention is as follows: A discrimination module includes a first operational amplifier U1, a second operational amplifier U2, and a monostable flip-flop U3. The input pulse signal GM-IN is amplified by the first operational amplifier U1 and the second operational amplifier U2 and then connected to the monostable flip-flop U3. The monostable flip-flop U3 discriminates the amplified input pulse signal GM-IN and outputs a signal GM-OUT.

[0007] The 3rd pin of the first operational amplifier U1 is used to connect the input pulse signal GM-IN and one end of a capacitor C1. The other end of the capacitor C1 is grounded. The 4th pin is connected to the output terminal OUT. The 5th pin is connected to the power supply Vcc. The 2nd pin is grounded. The 1st pin is connected to one end of a resistor R1, and the other end of the resistor R1 is used to connect the second operational amplifier U2.

[0008] The second operational amplifier U2 is configured such that the 7th pin is connected to the power supply Vcc, the 2nd pin is connected to the other end of the resistor R1, the 4th pin is grounded, the 6th pin is connected to one end of a resistor R2, the other end of the resistor R2 is used to connect the monostable flip-flop U3, the 3rd pin is connected to one end of a resistor R3, and the other end of the resistor R3 is connected to the other end of the resistor R2;

[0009] The described monostable flip-flop U3 is configured such that its pin 1 is grounded, pin 2 is connected to the other end of resistor R2, pin 3 is connected to one end of resistor R4, the other end of resistor R4 is connected to power supply Vcc, pin 4 is grounded, pin 5 is connected to one end of resistor R6, and the other end of resistor R6 is used to output signal GM-OUT. Pin 2 is connected to one end of resistor R5, the other end of resistor R5 is connected to the other end of resistor R6. Pin 6 is connected to one end of capacitor C2, the other end of capacitor C2 is connected to one end of resistor R7, and the other end of resistor R7 is connected to power supply Vcc. Pin 7 is connected to the other end of capacitor C2, and pin 8 is connected to both the other end of resistor R7 and one end of capacitor C3, and the other end of capacitor C3 is grounded.

[0010] The power supply Vcc is 3.3V.

[0011] A radiation inspection instrument includes a power supply module, a radiation detection module, a communication module, a display screen unit, and a camera unit. The power supply module provides working power for the radiation detection module, the communication module, and the display screen unit. Both the camera unit and the display screen unit are connected to the radiation detection module through the communication module.

[0012] The radiation detection module includes a GM tube detector, a discrimination module, a high-voltage unit, a processor, and a status indication unit. The output end of the GM tube detector is connected to the input end of the discrimination module, the output end of the discrimination module is connected to the input end of the processor, the processor provides working voltage for the GM tube detector through the high-voltage unit, and the status indication unit is connected to the processor.

[0013] The discrimination module is any one of the described discrimination modules.

[0014] The beneficial effects of the present invention are as follows: By setting the first operational amplifier U1 and the second operational amplifier U2 to shape and amplify the input pulse signal, and then using the monostable flip-flop U3 to discriminate the shaped and amplified pulse signal to obtain the corresponding output signal, the sensitivity of detecting weak pulse signals is improved, and the performance of the entire discrimination module circuit is stable. Description of the Drawings

[0015] Figure 1 is a circuit schematic diagram of a discrimination module provided by the present invention;

[0016] Figure 2 is a composition schematic diagram of a radiation inspection instrument provided by the present invention. Detailed Embodiments

[0017] In order to more clearly understand the above-mentioned objects, features, and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0018] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described within the scope here. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0019] A discrimination module and a radiation inspection instrument provided by the present invention, wherein the operational amplifier is a circuit unit with a very high amplification factor, often forming a certain functional module with a feedback network, and is an amplifier with a coupling circuit and feedback. The present invention amplifies and shapes the input pulse signal through the first operational amplifier U1 and the second operational amplifier U2, and the amplified and shaped pulse signal is then discriminated by the monostable flip-flop U3. The reason for using the monostable flip-flop for signal discrimination is that regardless of how long the trigger pulse signal lasts, the monostable flip-flop only maintains a given period of time determined by the external resistor-capacitor (resistance-capacitance) and then returns to the state before triggering. The external resistor-capacitor determines the monostable time. Because the trigger is edge-triggered, that is, the rising or falling edge, and can be re-triggered. The difference in the monostable is that when there is a trigger signal again before the monostable after the previous trigger has not returned to the state before triggering, the re-triggerable monostable will continue to maintain the monostable time given by the resistor-capacitor at the trigger edge, and the monostable flip-flop ignores the trigger signal after flipping. Therefore, the performance of the entire circuit will be more stable.

[0020] As an optional technical solution, the 3rd pin of the first operational amplifier U1 is used to connect the input pulse signal GM-IN and one end of the capacitor C1, the other end of the capacitor C1 is grounded, the 4th pin is connected to the output terminal OUT, the 5th pin is connected to the power supply Vcc, the 2nd pin is grounded, the 1st pin is connected to one end of the resistor R1, and the other end of the resistor R1 is used to connect the second operational amplifier U2;

[0021] Among them, the 1st pin is the OUT terminal, the 2nd pin is the -Vs terminal, the 3rd pin is the +IN terminal, the 4th pin is the -IN terminal, and the 5th pin is the +Vs terminal.

[0022] As an optional technical solution, the second operational amplifier U2 is configured as:

[0023] The 7th pin is connected to the power supply Vcc, the 2nd pin is connected to the other end of the resistor R1, the 4th pin is grounded, the 6th pin is connected to one end of the resistor R2, the other end of the resistor R2 is used to connect the monostable flip-flop U3, the 3rd pin is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the other end of the resistor R2;

[0024] Among them, pin 2 is the -IN terminal, pin 3 is the +IN terminal, pin 4 is the VEE terminal, pin 6 is the OUT terminal, and pin 7 is the VCC terminal.

[0025] As an alternative technical solution, the monostable flip-flop U3 is configured as follows:

[0026] Pin 1 is grounded, pin 2 is connected to the other end of resistor R2, pin 3 is connected to one end of resistor R4, the other end of resistor R4 is connected to power supply Vcc, pin 4 is grounded, pin 5 is connected to one end of resistor R6, the other end of resistor R6 is used to output signal GM-OUT, pin 2 is connected to one end of resistor R5, the other end of resistor R5 is connected to the other end of resistor R6, pin 6 is connected to one end of capacitor C2, the other end of capacitor C2 is connected to one end of resistor R7, the other end of resistor R7 is connected to power supply Vcc, pin 7 is connected to the other end of capacitor C2, and pin 8 is connected to both the other end of resistor R7 and one end of capacitor C3, and the other end of capacitor C3 is grounded;

[0027] Among them, pin 1 is the non-A terminal, pin 2 is the B terminal, pin 3 is the non-CLR terminal, pin 4 is the GND terminal, pin 5 is the Q terminal, pin 6 is the Cext terminal, pin 7 is the R / Cext terminal, and pin 8 is the VCC terminal.

[0028] As an alternative technical solution, the power supply Vcc is 3.3V.

[0029] To solve the problem that the pulse amplitude discriminator in the existing radiation patrol instrument has insufficient sensitivity when discriminating weak pulse signals, the present invention provides a radiation patrol instrument, including a power supply module, a radiation detection module, a communication module, a display screen unit and a camera unit. The power supply module provides working power for the radiation detection module, the communication module and the display screen unit. The camera unit and the display screen unit are both connected to the radiation detection module through the communication module;

[0030] The radiation detection module includes a GM tube detector, a discrimination module, a high-voltage unit, a processor and a status indication unit. The output end of the GM tube detector is connected to the input end of the discrimination module, the output end of the discrimination module is connected to the input end of the processor, the processor provides working voltage for the GM tube detector through the high-voltage unit, and the status indication unit is connected to the processor;

[0031] The discrimination module is a discrimination module as described in any one of the above.

[0032] Embodiment 1:

[0033] Such asFigure 1 As shown, a discrimination module includes a first operational amplifier U1, a second operational amplifier U2, and a monostable flip-flop U3. The input pulse signal GM-IN is amplified by the first operational amplifier U1 and the second operational amplifier U2 and then connected to the monostable flip-flop U3. The monostable flip-flop U3 discriminates the amplified input pulse signal GM-IN and outputs a signal GM-OUT.

[0034] By setting the first operational amplifier U1 and the second operational amplifier U2 to shape and amplify the input pulse signal, and then using the monostable flip-flop U3 to discriminate the shaped and amplified pulse signal to obtain the corresponding output signal.

[0035] One implementation of the first operational amplifier U1 is as follows:

[0036] Pin 3 is used to connect the input pulse signal GM-IN and one end of the capacitor C1. The other end of the capacitor C1 is grounded. Pin 4 is connected to the output terminal OUT. Pin 5 is connected to the power supply Vcc. Pin 2 is grounded. Pin 1 is connected to one end of the resistor R1. The other end of the resistor R1 is used to connect to the second operational amplifier U2; Pin 1 is the OUT terminal, Pin 2 is the -Vs terminal, Pin 3 is the +IN terminal, Pin 4 is the -IN terminal, and Pin 5 is the +Vs terminal.

[0037] Among them, the OUT terminal is the output terminal, the +IN terminal is the non-inverting input terminal, the -IN terminal is the inverting input terminal, the -Vs terminal is the negative terminal of the external power supply, and the +Vs terminal is the positive terminal of the external power supply.

[0038] One implementation of the second operational amplifier U2 is as follows:

[0039] Pin 7 is connected to the power supply Vcc. Pin 2 is connected to the other end of the resistor R1. Pin 4 is grounded. Pin 6 is connected to one end of the resistor R2. The other end of the resistor R2 is used to connect to the monostable flip-flop U3. Pin 3 is connected to one end of the resistor R3. The other end of the resistor R3 is connected to the other end of the resistor R2; Pin 2 is the -IN terminal, Pin 3 is the +IN terminal, Pin 4 is the VEE terminal, Pin 6 is the OUT terminal, and Pin 7 is the VCC terminal.

[0040] Among them, the +IN terminal is the non-inverting input terminal, the -IN terminal is the inverting input terminal, the VEE terminal is the grounded terminal, the VCC terminal is the power supply voltage terminal, and the OUT terminal is the output terminal.

[0041] Operating principle of the operational amplifier: It is an amplifier with extremely high gain and linearity; it includes two input terminals, one non-inverting input terminal and one inverting input terminal, and is very sensitive to small changes in the input signal; at the same time, the internal circuit design makes the offset voltage caused by temperature changes or the passage of time very small, ensuring stability over a long time and in different environments.

[0042] One implementation of the monostable flip-flop U3 is as follows:

[0043] Pin 1 is grounded, pin 2 is connected to the other end of resistor R2, pin 3 is connected to one end of resistor R4, the other end of resistor R4 is connected to power supply Vcc, pin 4 is grounded, pin 5 is connected to one end of resistor R6, and the other end of resistor R6 is used to output the signal GM-OUT. Pin 2 is connected to one end of resistor R5, the other end of resistor R5 is connected to the other end of resistor R6, pin 6 is connected to one end of capacitor C2, the other end of capacitor C2 is connected to one end of resistor R7, and the other end of resistor R7 is connected to power supply Vcc. Pin 7 is connected to the other end of capacitor C2, and pin 8 is connected to both the other end of resistor R7 and one end of capacitor C3, and the other end of capacitor C3 is grounded; Pin 1 is the non-A terminal, pin 2 is the B terminal, pin 3 is the non-CLR terminal, pin 4 is the GND terminal, pin 5 is the Q terminal, pin 6 is the Cext terminal, pin 7 is the R / Cext terminal, and pin 8 is the VCC terminal.

[0044] Among them, the non-A terminal represents a falling-edge trigger input; the B terminal represents a rising-edge trigger input; the non-CLR terminal is the reset terminal. When the monostable flip-flop U3 is normally used, the non-CLR terminal is connected to power supply Vcc (high level) through resistor R4. When reset is required, the non-CLR terminal is connected to low level; the GND terminal is the grounding terminal; the Q terminal is a high-level output; the Cext terminal is for external capacitor connection; R / Cext is for external capacitor and resistor connection; VCC is the power supply voltage terminal.

[0045] Operating principle of the monostable flip-flop: The monostable flip-flop U3 includes two types of inputs. The A terminal is active low, and the B terminal is active high. In this solution, the monostable flip-flop U3 is triggered by a high level, and external resistors and capacitors are used as timing elements. The width of its output pulse depends on the product of the timing resistor R7 and the timing capacitor C2, and the amplitude of the output pulse is related to the discrimination voltage VT. Only when the amplitude of the input pulse signal exceeds the discrimination voltage VT, a pulse signal with a specific amplitude and width is output, achieving the effect of signal discrimination.

[0046] Among them, the power supply Vcc is 3.3V. The power supply Vcc supplies power to the first operational amplifier U1.

[0047] Embodiment 2:

[0048] AsFigure 2 As shown in Figure 2 , a radiation inspection instrument includes a power supply module, a radiation detection module, a communication module, a display unit, and a camera unit. The power supply module provides working power for the radiation detection module, the communication module, and the display unit. Both the camera unit and the display unit are connected to the radiation detection module through the communication module.

[0049] The radiation detection module includes a GM tube detector, a discrimination module, a high-voltage unit, a processor, and a status indication unit. The output end of the GM tube detector is connected to the input end of the discrimination module. The output end of the discrimination module is connected to the input end of the processor. The processor provides the working voltage for the GM tube detector through the high-voltage unit. The status indication unit is connected to the processor.

[0050] The discrimination module is the discrimination module described above.

[0051] Working principle of the radiation inspection instrument: First, the GM tube detector detects and measures the energy of γ-rays and x-rays in nuclear radiation. Since the working voltage of the GM tube detector is in the hundreds of volts, the working voltage of the GM tube detector needs to be obtained by boosting the voltage provided by the power supply module through the high-voltage unit. The signal detected by the GM tube detector is discriminated by the discrimination module to form a square wave and sent to the IO port of the processor. The processor performs counting and smoothing and then fits it into a dose rate.

[0052] The processor performs wireless data transmission through the communication module; the processor takes pictures of the surrounding environment through the camera unit. When the detected radiation dose exceeds the standard, it can timely understand the on-site situation; the processor displays historical data charts, calibration factor modification, or source response inspection data records, etc. through the display unit; the processor displays the device operation status, alarm status, or sound and light indicator lights through the status indication unit.

[0053] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0054] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A screening module, characterized in that: The identification module includes a first operational amplifier U1, a second operational amplifier U2 and a monostable trigger U3. The input pulse signal GM-IN is amplified by the first operational amplifier U1 and the second operational amplifier U2 and then connected to the monostable trigger U3. The monostable trigger U3 identifies the amplified input pulse signal GM-IN and outputs a signal GM-OUT.

2. A screening module as claimed in claim 1, characterized in that: Pin 3 of the first operational amplifier U1 is used to connect the input pulse signal GM-IN and one end of the capacitor C1, the other end of the capacitor C1 is grounded, pin 4 is connected to the output end OUT, pin 5 is connected to the power supply Vcc, pin 2 is grounded, pin 1 is connected to one end of the resistor R1, and the other end of the resistor R1 is used to connect the second operational amplifier U2.

3. A screening module as claimed in claim 1, characterized in that: The second operational amplifier U2 is configured such that pin No. 7 is connected to the power supply Vcc, pin No. 2 is connected to the other end of the resistor R1, pin No. 4 is grounded, pin No. 6 is connected to one end of the resistor R2, the other end of the resistor R2 is used to connect to the monostable trigger U3, pin No. 3 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the other end of the resistor R2.

4. A screening module as claimed in claim 1, characterized in that: The monostable trigger U3 is configured as follows: pin 1 is grounded, pin 2 is connected to the other end of resistor R2, pin 3 is connected to one end of resistor R4, the other end of resistor R4 is connected to power supply Vcc, pin 4 is grounded, pin 5 is connected to one end of resistor R6, the other end of resistor R6 is used to output signal GM-OUT, pin 2 is connected to one end of resistor R5, the other end of resistor R5 is connected to the other end of resistor R6, pin 6 is connected to one end of capacitor C2, the other end of capacitor C2 is connected to one end of resistor R7, the other end of resistor R7 is connected to power supply Vcc, pin 7 is connected to the other end of capacitor C2, pin 8 is connected to the other end of resistor R7 and one end of capacitor C3, and the other end of capacitor C3 is grounded.

5. A screening module as claimed in claim 2, characterized in that: The power supply Vcc is 3.3V.

6. A radiation inspection instrument, characterized in that: It includes a power module, a radiation detection module, a communication module, a display screen unit and a camera unit, wherein the power module provides working power for the radiation detection module, the communication module and the display screen unit, and the camera unit and the display screen unit are connected to the radiation detection module through the communication module; The radiation detection module includes a GM tube detector, a discrimination module, a high-voltage unit, a processor and a status indication unit. The output end of the GM tube detector is connected to the input end of the discrimination module, the output end of the discrimination module is connected to the input end of the processor, the processor provides a working voltage for the GM tube detector through the high-voltage unit, and the status indication unit is connected to the processor.

7. A radiation inspection instrument as claimed in claim 6, characterized in that: The identification module is a identification module as described in any one of claims 1-5.

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