KR101672488B1

KR101672488B1 - High-speed high-precision neutron measurement system

Info

Publication number: KR101672488B1
Application number: KR1020150060348A
Authority: KR
Inventors: 이승호; 이주현
Original assignee: 한밭대학교 산학협력단
Priority date: 2015-04-29
Filing date: 2015-04-29
Publication date: 2016-11-04

Abstract

The present invention relates to a high-speed, high-precision neutron measuring system, and more particularly, to a high-speed, high-precision neutron measuring system for detecting neutrons by selectively using a pulse signal generated in response to the detection of thermal neutrons through a sensor or an ultra-low current generated through a boron- A neutron detection unit, a high voltage generation unit for generating a set high voltage to be supplied to the neutron detection unit in accordance with a setting condition including the type of the sensor, an amplification and filter unit for selectively amplifying a pulse signal or a very low current, A pulse count and a low current measurement control section for counting the amplified and filtered pulse signals or converting a low current into a voltage to convert it into high speed and high resolution digital data and controlling the high voltage generation section in accordance with the neutron detection result, And an output unit for outputting. According to the present invention, it is possible to measure neutrons at high speed and high precision using various measurement methods.

Description

[0001] HIGH-SPEED HIGH PRECISION NEUTRON MEASUREMENT SYSTEM [0002]

The present invention relates to neutron measurement technology, and more particularly, to a high-speed and high-precision neutron measurement system capable of measuring neutron with high accuracy and high accuracy.

Radiation detectors, which have been developed since Mrs. Curie's discovery of radiation in 1897, are used as detectors for measuring natural and artificial radiation.

In the case of general radiation, basic science is used to determine the nature of nuclei and small particles by measuring the intensity and energy of radiation. For medical use, X-rays and gamma rays are used in equipment such as gamma camera, CT, And for industrial use, digital radiation nondestructive inspection, liquid level measurement, thickness and density measurement, and component measurement are also used.

Neutron, on the other hand, is the first material discovered by British physicist James Chadwick in 1932, and is a non-electrical particle. Neutrons are highly permeable because they do not have electrical properties, and they have scattering properties that are distributed at a certain angle depending on the properties of the material being contacted. It does not react with the electrons outside the atoms, so it can penetrate deeply into the structure to identify internal structures and components, and can check for defects in the aviation engine, internal abnormality of large structures such as large ships.

Thus, neutrons typically have the energy (equivalent to the amount they are exposed) to penetrate lead and steel plates that can shield radiation, so neutron counts must be measured through more precise instruments.

However, existing instruments do not propose an effective method for measuring high-speed neutrons, and there is a problem that it is difficult to apply to a variety of environments by using a single measurement method. Further, techniques for processing a detected weak signal at high speed and high precision and generation of a stable high voltage supplied to a neutron sensor are insufficient.

Korean Patent Publication No. 10-2010-0125326 (published on November 30, 2010) Korean Patent Publication No. 10-2011-0034576 (published on Apr. 25, 2011) Korean Registered Patent No. 10-1376704 (Published on Mar. 31, 2014)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a high-speed, high-precision neutron measurement system capable of detecting neutrons using polyethylene (paraffin) as a reducing agent.

It is another object of the present invention to provide a high-speed, high-precision neutron measurement system capable of measuring a signal measured with an extremely low current more precisely and quickly.

It is still another object of the present invention to provide a high-speed, high-precision neutron measurement system capable of generating a high-precision voltage in order to stably operate a neutron sensor.

It is still another object of the present invention to enable accurate transmission of measured information to administrators and users using a high-speed, high-precision neutron measurement system.

In order to accomplish the above object, the present invention provides a high-speed, high-precision neutron measurement system for selectively measuring a pulse signal generated in response to thermal neutron detection through a sensor or an ultra-low current generated through a boron- A neutron detector for detecting a neutron using the neutron detector; A high voltage generator for generating a set high voltage to be supplied to the neutron detector in accordance with a setting condition including a sensor type; An amplifying and filtering unit for selectively amplifying the pulse signal or the ultra-low current and removing a noise component; A pulse count and a low current measurement control unit for counting the amplified and filtered pulse signals, converting a low current into a voltage, converting the amplified and filtered pulse signals into digital data of high speed and high resolution, and controlling the high voltage generating unit according to the neutron detection result; And an output unit for outputting neutron detection results.

Preferably, the neutron detector is surrounded by a polyethylene resin.

The amplifying unit in the amplifying and filtering unit includes a preamplifier for amplifying a fine signal through a low temperature thermostat system; A differential amplifier for performing differential amplification through a multi-stage variable amplifier which varies in accordance with the magnitude and intensity of the amplified signal; An ADC (Analog Digital Converter) for converting an analog signal into a digital signal at a setting speed and precision corresponding to an amplification ratio of the multi-stage variable amplifier; And a DSP (Digital Signal Processor) that performs an operation to minimize interference due to noise and continuous signals, and performs compensation for the differential amplifier and the ADC corresponding to the magnitude and intensity of the digital signal.

Wherein the differential amplifier includes: a preprocessing amplifier for converting a low-noise, low-input bias current into a voltage and performing preprocessing amplification; A variable gain amplifier that varies in accordance with a voltage gain and performs differential amplification; And a selector for selecting the gain variable amplifier in response to the control of the DSP.

The differential amplifier preferably further includes an attenuator which is switched by the DSP to perform output control of the variable gain amplifier.

The filter unit in the amplification and filter unit may use a Gaussian filter or a matched filter.

The high voltage generating unit may include a comprehensive switching regulator for outputting a target voltage corresponding to a remote voltage or a setting command transmitted from the outside or the pulse count and low current measurement control unit; And a precision linear regulator that performs efficiency, precision maintenance, and noise removal of the target voltage.

The overtaking switching regulator includes a reference voltage generating unit for generating a reference voltage 1 and a reference voltage 2 corresponding to control values transmitted from a remote or the pulse count and low current measurement control unit; A PWM controller for performing PWM (Pulse Width Modulation) control on the reference voltage 1; A high voltage generating unit for generating a high voltage capable of operating in the precision linear regulator through switching and transforming in accordance with the PWM control; And a rectification and voltage detection unit for detecting and outputting rectification and voltage and feeding back the detection result to the PWM control unit.

The precision linear regulator includes: a noise filter for removing noise from an output of the rectifying and voltage detecting unit; And a linear high voltage control unit for linearly controlling and outputting the high voltage from which the noise is removed and the high voltage from the reference voltage 2.

As described above, according to the high-speed and high-precision neutron measuring system of the present invention, the sensor for neutron measurement is controlled through the pulse output and the current output, so that the control method can be selectively changed according to the characteristics of the sensor . In other words, both types of sensors can be employed.

Further, according to the present invention, high-speed high-precision neutron measurement can be performed because it is possible to measure more precisely and quickly through a high-speed ADC and precise high-voltage generation.

According to the present invention, the present invention can be applied to an environment connected to the Internet such as a smart phone and a personal computer equipped with a wired / wireless communication function. By using the remote wireless communication, neutron measurement information Can be monitored.

1 is a configuration diagram of a high-speed and high-precision neutron measuring system according to an embodiment of the present invention.
2 is a configuration diagram of an amplification unit in an amplification and filter unit according to an embodiment of the present invention.
3 is a detailed configuration diagram of a preamplifier and a differential amplifier of the amplifying unit according to an embodiment of the present invention.
4 is a configuration diagram of a high voltage generating unit according to an embodiment of the present invention.
5 is a configuration diagram of a comprehensive switching regulator according to an embodiment of the present invention.
6 is a configuration diagram of a precision linear regulator according to an embodiment of the present invention.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. It is provided to let you know completely.

The present invention relates to a measurement system for measuring a neutron in a nuclear medicine hospital and a nuclear medicine hospital and a laboratory of a medical institution having a linear accelerator or a circular accelerator for therapeutic purposes.

Hereinafter, a high-speed and high-precision neutron measuring system according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a high-speed and high-precision neutron measuring system according to an embodiment of the present invention.

Referring to FIG. 1, the high-speed and high-precision neutron measuring system of the present invention generates a pulse signal in response to the detection of thermal neutrons through a sensor and generates a pulse signal by using a boron-coated ionizer for high- A high voltage generation section 2 for generating a set high voltage to be supplied to the neutron detection section 1 in accordance with a setting condition including the type of the sensor, An amplifying and filtering unit 3 for selectively amplifying a very low current and removing a noise component, and a control unit 3 for counting the amplified and filtered pulse signals or converting a low current into a voltage to convert it into digital data of high speed and high resolution, A pulse count and low current measurement control section 4 for controlling the high voltage generating section 2 in response to the result, An output unit 5, and a power supply unit (not shown) for supplying power in a fixed or mobile fashion.

Here, it is preferable that the set high voltage generated from the high voltage generating portion 2 is set between 500 and 2,000 [V].

In addition, the power supply unit preferably includes a built-in battery, and may further include a charging unit charging the battery. When the external power is supplied by using the charger, the battery is charged. When the external power supply is disconnected, the battery can be used to operate the system normally. On the other hand, by using a battery, high-speed, high-precision neutron measurement system can be carried.

In the high-speed, high-precision neutron measurement system of the present invention, it is preferable to further connect a wired / wireless communication unit for transmitting the detection result corresponding to the remote monitoring and monitoring environment. In other words, the wired / wireless communication unit uses the wired / wireless communication function to transmit the measured and analyzed detection results to the neutron by the neutron measurement monitoring device or the monitoring and manager room monitoring device.

On the other hand, the pulse count and low current measurement control unit 4 accumulates and averages the pulse signals inputted with respect to time in consideration of characteristics in which the pulse signals are not input linearly from the sensors, and increases the number of pulses abruptly Or if the number of pulses is sharply reduced while the number of high pulses is being measured, it is possible to immediately grasp the changed state and transmit it to the user.

The output unit 5 is preferably operated together with an alarm unit (alarm and buzzer).

Here, the neutron detection unit 1, the high voltage generation unit 2, the amplification and filter unit 3, the pulse count and the low current measurement control unit 4 constituting the high speed and high precision neutron measurement system will be described in detail.

Neutron detector

The neutron detection unit 1 uses a method of generating a pulse signal in response to the detection of thermal neutrons through a sensor and a method of generating a very low current by using a boron-coated ionization chamber for a high-speed neutron, It is preferable to be enclosed. The polyethylene resin can be configured to have a cylindrical or spherical shape using a general polyethylene resin or a high-density polyethylene resin. In addition, the thickness of the polyethylene resin should be considered so that high-speed neutrons can be measured. That is, by increasing the thickness of the high-density polyethylene, the neutron velocity is reduced, and the thermon-neutronized decayed neutron is measured.

The neutron detector 1 may be a gas type neutron detector, a scintillator neutron detector, a semiconductor neutron detector, a decelerating detector, or a detector of the ionizer type. Any type of sensor that detects neutrons through signal output can be applied. That is, in the present embodiment, the pulse signal, the current, and the voltage signal in the neutron detector 1 can be generated and processed.

Amplification and filter section

First, the amplification section in the amplification and filter section 3 will be described.

FIG. 2 is a block diagram of an amplifying unit in an amplifying and filtering unit according to an embodiment of the present invention, and FIG. 3 is a detailed configuration diagram of a preamplifier and a differential amplifier in an amplifying unit according to an embodiment of the present invention.

2 and 3, the amplifying unit of the present invention includes a preamplifier 31 for amplifying a fine signal through a low-temperature constant-temperature system, and a differential amplifier for varying the magnitude and intensity of the amplified signal. An analog-to-digital converter (ADC) 33 for converting an analog signal into a digital signal at a setting speed and precision corresponding to the amplification ratios of the multi-stage variable amplifiers, an interference And a DSP (Digital Signal Processor) 34 for performing compensation for the differential amplifier 32 and the ADC 33 corresponding to the magnitude and intensity of the digital signal.

The differential amplifier 32 includes a preprocessing amplifier 321 for converting a low noise and a low input bias current into a voltage and performing preprocessing amplification, a gain variable amplifier 322 for performing differential amplification in accordance with the voltage gain, And a selector 323 for selecting the gain variable amplifier 322 in response to the control.

The amplifying unit preferably further includes an attenuator that is switched by the DSP 34 to perform output control of the gain variable amplifier 322. [

3, the preprocessing amplifier 321 (A1) and the variable gain amplifiers 322 (A2, A3, A4) constituting the low-temperature constant-temperature system are continuously arranged. In order to connect and disconnect the amplifiers, .

In this way, among the sensors for detecting neutrons, the current signal output from the sensor, which measures the fast neutron (in the case of measuring the extreme low current through the current output), is vulnerable to the influence of noise, Amplifies a fine current signal using a low temperature thermostatic system structure. That is, since the current outputted from the neutron detector 1 is a very low current and the output current can not be directly used even if it is converted into a voltage, a low-temperature thermostat system is constituted so as to minimize the noise influence through the preamplifier 31 An amplification circuit is constructed. Then, the amplified signal is subjected to differential amplification through a multi-stage variable amplifier which is automatically varied according to the magnitude and intensity of the signal, and the amplified signal is amplified by a high-precision ADC 33, And the strength is taken into consideration.

On the other hand, when neutrons are detected through a sensor of a pulse signal output method, the output pulse signal is a weak signal, so that it can not be normally recognized as a pulse in a digital system. The weak signal is amplified and improved to a signal which can be sufficiently recognized by the digital circuit.

Since the amplified signal is amplified together with the original signal as well as the noise, a method for reducing the noise is to use a Gaussian filter or a matched filter or the like to clearly detect a signal to be input, which is superimposed on a noise component included in the input signal. And constitutes a filter section for separating signals.

Accordingly, it is preferable to apply a proper filter to the signal input from the sensor in the primary amplified signal by the pre-amplification function, and then extract the stable detection target signal through the main amplification.

On the other hand, since the sensor for detecting neutrons has a very large displacement range of about 1 nA to 10 mA, it is difficult to operate precisely in one stage. Therefore, in the present invention, a method of adjusting the amount of gain of the amplifier corresponding to the size of the converted signal is used. The gain of the amplifier is frequently changed (continuous gain control using a variable resistor or the like, gain control through a structural change, etc.) to transfer a signal of a proper size to the high-speed, high-resolution ADC 33 constituting the pulse count and low current measurement control unit 4. [ Etc.). In the present invention, a structure that facilitates precision is used.

In order to change the structure of the circuit, there is a part for determining the gain in the basic amplifier part and the feedback part, and it is necessary to connect or disconnect the necessary parts. For the connection and disconnection of the circuit, a relay having a relatively small parasitic effect and a low insertion loss is used. Particularly, in the configuration of the first stage, a latch type relay is used so that the noise of the current flowing through the drive coil does not affect the signal to be measured. As you drive the relays, you can change the gain of the circuit to x / 10, 1x, 10x, 100x, 1,000x, 10,000x, 100,000x and adjust the gain using the processor.

The procedure to control is as follows.

1. Keep the temperature of the front amplifier constant throughout the process.

2. Set the overall gain to the lowest and check the output voltage.

3. If the measured value is less than 0.5 V with the input signal connected, adjust the gain to the next level and repeat the measurement. At this time, 0.5 V is derived from the input range of the ADC 33, and the final value is preferably determined through experimentation.

4. Connect the input to GND in the final state of the previous step to check the output value at "0" current. This value is used as a correction value for the value obtained later.

The temperature of the amplifier is closely related to the amount of thermal noise generated by the amplifier itself. To reduce the noise of the amplifier caused by heat, it is necessary to lower the temperature, but it becomes bulky and costly to apply to a very low temperature all around (for example, -40 ° C, the lowest operating temperature of the parts guaranteed by the manufacturer) There is a problem. In the present invention, it is preferable to apply only to the extent that the amount of change by the ambient temperature is reduced, although a certain degree of thermal noise is recognized. Since the influence of noise at the front end is greatest in the entire circuit, the temperature is controlled only at this part, and the temperature is adjusted at around 0 ° C to reduce the burden of temperature control. As a method of controlling the temperature, a Peltier element is used to raise or lower the temperature. Since a large current flows in a few amperes [A], it is driven by an analog waveform to prevent induction of noise due to the temperature control element. It is preferable to set the temperature of the first stage and the second stage of the amplifier to 0 deg.

If the gain of the entire amplifier stage is large, the possibility of oscillation increases due to the influence of the signal line wiring and the power line sharing. In this system, when all the amplification stages are activated, they have a power gain of 100 dB, so there is a high possibility of oscillation through coupling of electromagnetic waves through space (for example, transmission energy (0 dBm) and receiving energy (-90 dBm) Is less than 100 dB). To prevent this, each stage including the amplifier and the relay uses a separate shield can, and the connection between each shield can minimizes the exposure to the outside. It also reduces the possibility of oscillation by ensuring a filter between the power supplies.

The operation of each amplifier stage is controlled by a single processor by driving a coil through a dedicated processor. Therefore, the signal that controls the front stage amplifier and the rear amplifier is placed on the opposite side of the processor and the low pass filter is applied to the control signal.

The signal through the amplifier is less than 5V in magnitude and the minimum signal is in the range of 0.1 V (1 nA * 100 Mohm).

The structural characteristics are as follows.

1. A cascaded multi-stage amplifier structure configured by multiplying gain per amplifier stage.

2. An amplifier configured to receive a low temperature influence by adding a cold temperature system to the first amplification stage.

3. An amplifier configured to add and subtract a "0" input to obtain and correct the offset of the amplifier itself.

The high-

The power source for use in the neutron detection sensor is capable of supplying a current of up to 10 mA with a variable voltage between 500 V and 2,000 V and requires a small voltage ripple. Accordingly, the high voltage generating portion (2) of the present invention has the following structure.

A typical switching regulator monitors the output power, and when the output voltage is lower than the reference voltage, it transmits enough energy to exceed the reference voltage and repeats the operation to monitor the output until it drops. At this time, if the delay time of the portion monitoring the output is long, the output decrease detection and the increase of the energy transfer output become longer, and the change of the output voltage becomes larger. Even with precise control, there is ripple of several tens of millivolts [mV] in normal SMPS (Switching Mode Power Supply) method. Especially, in the case of high voltage, the delay time of voltage monitoring part becomes long and change to several volts [V] .

In the case of analog control of input voltage of sufficient size in order to reduce noise due to ripple of output voltage, it is possible to make very small ripple but power loss in control part becomes bigger. In case of this neutron sensor power supply Likewise, if the range of change is very large, the loss increases further. In order to overcome the above limitations, it has a complex structure using one stage SMPS for low power and one stage of linear regulator for high precision.

4 is a configuration diagram of a high voltage generating unit according to an embodiment of the present invention.

Referring to FIG. 4, the high voltage generating unit 2 of the present invention includes a comprehensive switching regulator (Coarse) for outputting a target voltage corresponding to a remote voltage or a setting command transmitted from an external or pulse count and low current measurement control unit 4 A switching regulator 21 and a precision linear regulator 22 for performing the efficiency of the target voltage (heat generation), maintaining the precision, and removing the noise.

5 is a configuration diagram of a comprehensive switching regulator according to an embodiment of the present invention.

5, the comprehensive switching regulator 21 of the present invention generates a reference voltage 1 and a reference voltage 2 corresponding to the control value transmitted from the remote or pulse count and low current measurement control unit 4, A PWM controller 212 for performing PWM (Pulse Width Modulation) control on the reference voltage 1, and a PWM controller 212 for smoothly operating in the second stage (linear high voltage controller) And a rectifying and voltage detecting unit 214 for detecting and outputting rectified and voltage and feeding back the rectified and voltage to the PWM control unit 212. The high voltage generating unit 213 generates a high voltage,

6 is a configuration diagram of a precision linear regulator according to an embodiment of the present invention.

Referring to FIG. 6, the precision linear regulator 22 of the present invention includes a noise filter 221 for removing noise from the output of the rectifying and voltage detecting unit 214, a high- And a linear high voltage control unit 222 for linearly controlling and outputting the linear high voltage.

In the high voltage generating unit 2 configured as described above, the high voltage generating unit 213 at the first stage generates the output voltage only up to a voltage at which the second stage linear high voltage controlling unit 222 can smoothly operate, and the linear high voltage controlling unit 222, Which precisely controls it to generate an output. The input / output voltage difference of the linear high voltage controller 222 is not large, so that the power loss can be reduced.

On the other hand, a photocoupler can be used as the main current path control element for controlling the voltage of the second stage, and the high dielectric strength of the photocoupler contributes greatly to the reduction of the leakage current of the high voltage portion through the control circuit. Also, the output voltage is monitored by using a resistance of 20 Mohm in the voltage detecting section.

The characteristics of the overvoltage generator are as follows.

1. It has a first stage that produces a voltage close to the target with high efficiency and a second stage that produces an accurate target voltage with low noise.

2. Structure to control the second stage linear voltage control directly by using photocoupler in main current path.

Output portion

The output unit 5 receives the digitally converted data through the pulse count and low current measurement control unit 4 and displays the intensity of the neutron detected by the user.

The number of pulses per unit time input by the pulse count can not be maintained constantly, and it is difficult to specify the value because the value of the pulse is much larger than the reference value due to the analog characteristics of the sensor. Accordingly, if the pulse count per unit time measured for a predetermined time is accumulated and the average value is transmitted to the user display device, the intuitively measured value can be read. For example, after reading a pulse measurement of 300 seconds, the value can be divided by 300 seconds to provide a mean value. In this case, if the data is accumulated for the initial 300 seconds, it is possible to provide an average value of 300 seconds to the user. In this general function of counting the number of pulses received from the sensor, if the number of weakly measured pulses increases sharply or conversely if a large number of pulses decreases sharply, if operated by the function of the cumulative average, (300 seconds) is required for the user to determine. Therefore, it is very difficult to monitor neutron levels and work environment. Therefore, a 300 second window is created with FIFO (First In First Out) to the existing window function of 300 seconds cumulative average to accumulate the number of first pulses per second up to 300 seconds, discard the first 1 second value at 301 seconds, To maintain a window of 300 seconds at all times. The size of the above window (300 seconds) can be increased or decreased by user setting, and a small window (active window) is added to the configured window for the cumulative average to be applied to the rear of the existing window If an active window is specified at a user-specified time, for example, 8 seconds, and a pulse having a remarkably large number of pulses is input to the ratio of the existing averages for 8 seconds or a pulse having a significantly small pulse is input, And the information such as the amount of neutrons (radiation dose) corresponding to the changed value is provided to the user. In addition, the measured values can be intuitively displayed in units of time to intuitively display instant neutron detection values.

The display device is configured to be intuitively monitored by being installed in a work space in which a neutron detection system is installed, a control unit, and an administrator room. It is configured to monitor additional information such as neutron measurement data and radiation dose in real time numerical value and graph form by using TFT LCD in general. If the device needs to be compact, it can be configured as a low-power product by reducing the power consumption by custom LCD. It also has a setting function that can be connected to an external communication method by providing a detailed setting function.

Wired / wireless communication department

The wired / wireless communication unit receives the data converted into digital data through the pulse count and low current measurement control unit 4 so that the intensity of the neutron detected by the user can be transmitted to another display device or manager room for monitoring and status monitoring In this case, data communication is established through the wired / wireless communication function.

The wired / wireless communication unit can apply various communication methods according to the application range. In the case of the example of the present invention, the wireless communication unit proposes and applies it in a limited manner. The high-speed and high-precision neutron detection system operates in a nuclear power plant, a peripheral facility, and a research facility where an accelerator of a medical institution operates, and is intuitively monitored at a work site. At the same time, a neutron detected by a remote monitoring display device, And can be configured to monitor the measurement information of the detection system. In this case, the measured data can be connected to the high-speed and high-precision neutron measurement system by wire, and data can be transmitted to the outside through wired / wireless communication. For example, RS-232C or RS-485 communication or Ethernet can be applied between the two devices. The external storage condition monitoring device can be connected to the safety manager monitoring device or the Internet via Zigbee, (Bluetooth), Wi-Fi, mobile communication network, etc., and can transmit measured data to the outside through wired method such as RS-485, RS-232C and Ethernet.

Power supply

The power supply unit can be divided into a case where the power supply unit is normally supplied and a case where the power supply unit is used as a portable unit. The biggest problem of the constant power supply is its function and role depending on how to define the condition of the device It will be very different. The power supply circuit according to the present invention charges a battery built in when the power is always supplied. When the power is not supplied for an abnormal reason, the device is automatically operated by the battery and the battery is charged for a long time Or the maximum time for which the user can operate the device, or the device is operated for a predetermined time, and the device is operated in a standby mode until the time when the system is reliably shut down and then the user supplies the power again, A method of terminating the process may be applied. Since the system needs to be driven by the internal battery, the power consumption is designed to be minimized. Separate charging circuits can also be configured for portable high-speed, high-precision neutron detection systems.

Alarm (alarm and buzzer)

The alarms (alarms and buzzer) are used when the result of the monitoring of the neutron detection system exceeds the limits of the operating facilities and the limits specified by the operator, the safety manager, the nuclear facility and surrounding facilities, medical facilities using accelerators of medical institutions, And a research and production facility for production of medicines, as well as a status monitoring display device in a control and safety manager room, etc., and also provides an alarm through a warning lamp and a buzzer. The warning light and the buzzer are configured to indicate the degree and state of the warning through a signal indicating various signs and a buzzer sound according to the condition.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

1: Neutron detector
2: High voltage generator
3: amplification and filter section
4: Pulse count and low current measurement control section
5: Output section

Claims

A neutron detector for selectively detecting a neutron by selectively using a pulse signal generated in response to the detection of thermal neutrons through a sensor or an ultra-low current generated through a boron-coated ionizer to a high-
A high voltage generator for generating a set high voltage to be supplied to the neutron detector in response to a setting condition including a sensor type,
An amplifying and filtering unit for selectively amplifying the pulse signal or the ultra-low current and removing a noise component,
A pulse count and low current measurement control unit for counting the amplified and filtered pulse signals or converting a low current into a voltage and converting the same into digital data of high speed and high resolution and controlling the high voltage generating unit in accordance with the neutron detection result,
An output unit for outputting neutron detection results,
A power supply for supplying power and
And transmits the data converted to digital data through the pulse count and low current measurement control unit to the display unit and the manager room for monitoring and monitoring status of the neutrons detected by the user,
/ RTI >
The high-
A comprehensive switching regulator for outputting a target voltage corresponding to a remote voltage or a setting command transmitted from an external or the pulse count and low current measurement control unit,
A precision linear regulator that performs efficiency, precision maintenance, and noise elimination of the target voltage
Lt; / RTI >
The neutron detection unit is wrapped with a high-density polyethylene resin so that the neutron velocity is reduced,
Wherein the power supply unit includes a battery and a charging unit charging the battery,
The system is operated by the battery when the constant power is not supplied for an abnormal reason, and the power supply unit is operated stably by the battery. And then the system is shut down in the standby mode until the time when the user supplies the power again or when the user turns on the power, and the system can be used for portable use by the charged battery,
The overturning switching regulator includes:
A reference voltage generator for generating a reference voltage 1 and a reference voltage 2 corresponding to control values transmitted from a remote or the pulse count and low current measurement control unit, a PWM (Pulse Width Modulation) A high voltage generating unit for generating a high voltage capable of operating in the precision linear regulator through switching and transforming in accordance with the PWM control, and a rectifier for detecting and outputting a rectified and voltage and feeding back the detection result to the PWM control unit, A high-speed, high-precision neutron measurement system comprising a voltage detector.

delete

The method according to claim 1,
Wherein the amplifying unit in the amplifying and filtering unit comprises:
A preamplifier for amplifying a fine signal through a low temperature thermostat system;
A differential amplifier for performing differential amplification through a multi-stage variable amplifier which varies in accordance with the magnitude and intensity of the amplified signal;
An ADC (Analog Digital Converter) for converting an analog signal into a digital signal at a setting speed and precision corresponding to an amplification ratio of the multi-stage variable amplifier; And
A DSP (Digital Signal Processor) that performs an operation that minimizes interference due to noise and continuous signals, and performs compensation for the differential amplifier and the ADC corresponding to the magnitude and intensity of the digital signal,
The differential amplifier includes:
A pre-processing amplifier for converting a low-noise, low-input bias current into a voltage and performing preprocessing amplification;
A variable gain amplifier that varies in accordance with a voltage gain and performs differential amplification; And
And a selector for selecting the gain variable amplifier in response to the control of the DSP.

delete

The method according to claim 1,
The precision linear regulator includes:
A noise filter for removing noise from an output of the rectifying and voltage detecting unit; And
And a linear high voltage control unit for linearly controlling and outputting the high voltage from which the noise is removed and the high voltage from the reference voltage 2.