JPS61170688A - Method and device for monitoring radiation - Google Patents

Abstract

PURPOSE:To assure an efficient transmission system by connecting a radiation detector and monitor device with one signal line and transmitting and receiving a serial signal. CONSTITUTION:The transmission data from an n-th detector 31-n is applied through a coaxial cable 33-n to a field unit 34. The data is then transmitted from a serial transmitter 35-n to a digital serial transmitter 37 by which the data is converted to a light signal and is transmitted to an optical transmitter 38. The light signal is finally received by the monitor device 39 and is processed by said device and is then outputted to an alarm circuit 24 and a recorder 25. The monitor can be executed with all the detectors if such operation is repeated N-times. M units of digital serial transmitters 40 are provided in the monitor device 39 and field units 34 are provided with the respective transmitters by which the connection of MXN units of the detectors to one monitor device is made possible. The control of the many detectors between, for example, buildings, with one monitor device is thus made possible.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a radiation monitoring method and a monitoring device, particularly a radiation monitoring method and monitor of a type in which a transmission path is provided between a radiation detector and a monitoring device used in nuclear power plants, etc. Regarding equipment.

[Technical background of the invention]

FIG. 8 shows a schematic configuration diagram of a conventional radiation monitor device.

The detector 11 has a radiation sensor 12, a calibration circuit 13, a changeover switch 14, and an output buffer 15, and the monitor device 17 has a high voltage power supply 18, a low voltage power supply 19, a discriminator 20, a discrimination level setter 21, a switching circuit 22, and processing circuit 2
It has 3. In order to connect each of the above elements, the detector 11 and the monitor device 17 are connected by a multicore cable 16. Generally, the detector 11 is installed at the site, and the monitor device H17 is installed at a remote operation location to ensure the safety of the operator. High voltage power supply 1 to detector 11
Power is supplied from 8 and a low voltage power supply 19 via a multicore cable 16. A detection signal detected by the radiation sensor 12 is driven by an output buffer 15 and transmitted to a monitor device via a multicore cable 16. This detection signal is compared with the level set in the discrimination level setter 21 by the discriminator 20, processed by the processing circuit 23, and activated by the alarm circuit 24 or recorded in the recorder 25.
l! Immediate action will be taken. Further, when performing calibration, the changeover switch is changed over by a switching signal from the switching circuit 22 so that the output of the calibration circuit 13 is transmitted instead of the radiation sensor 12, and the calibration is performed.

[Problems with background technology]

Generally, a multiple Brenel monitoring system is used in nuclear power plants and the like. That is, as shown in FIG. 9, N detectors 11-1 to 11-N are installed at the site, and correspondingly N monitor devices 17-1 to 17-N are installed at the operation location. Ru. Moreover, between these, each multi-core cable 1
Since 6-1 to 16-N are provided, the system configuration for one channel becomes necessary for N channel V channels. This has the disadvantage that not only does the installation cost become high, but also a considerably large installation space is required. Also,
Even in a 1-channel system, as shown in Figure 8, in conventional systems, multi-core cables serve as supply paths for various signals including detection signals and various power sources, so
A multi-core cable is required. This also causes external noise to enter various signals, resulting in a reduction in SN and
This may cause erroneous counts on the monitor device, which may impede accurate measurement.

[Purpose of the invention]

Therefore, an object of the present invention is to provide a radiation monitoring method and a monitoring device that can ensure an efficient transmission system even in a multi-channel monitoring system.

[Summary of the invention]

The first feature of the present invention is that in a radiation monitoring method, a radiation detector and a monitoring device are connected through a single signal line, and signals are transmitted and received using serial signals to ensure an efficient transmission system.

The second feature of the present invention is that in the radiation monitoring method, in order to monitor N radiation detectors with one monitoring device,
In addition to the command signal from the monitor device, a signal for selecting one radiation detector is transmitted, thereby ensuring an efficient transmission system.

A third feature of the present invention is that in a radiation monitoring device, a radiation sensor or the like, a first serial converter converts a parallel signal output of the radiation sensor into a serial signal, and converts a serial signal input to the radiation sensor υ into a parallel signal. N detectors having a transmitter; N serial signal transmission lines having one end connected to each of the first serial transmitters of the N detectors; and N serial signal transmission lines having one end connected to each of the first serial transmitters of the N detectors. N second serial transmitters connected to each other end of the transmission line, converting a serial signal from the radiation sensor into a parallel signal, and converting a parallel signal provided to the radiation sensor into a serial signal; A monitor device is provided which is connected to each of the second serial transmitters and has a processing circuit that gives instructions to the radiation sensor and processes the measurement results of the radiation sensor, thereby creating an efficient transmission system. The point is that it has been secured.

A fourth feature of the present invention is that a radiation monitoring device includes a radiation sensor, a first serial signal that converts a parallel signal output of the radiation sensor into a serial signal, and a first serial signal that converts a serial signal input to the radiation sensor signal into a parallel signal. a transmitter; N number of serial signal transmission lines each having one end connected to each of the first serial transmitters of the N number of detectors; and the N number of serial signal transmission lines. A field unit connects the other end of the transmission line to one end of one transmission line, and a field unit connected to the other end of the one transmission line converts the serial signal from the rllrJJ line sensor into a parallel signal, and converts the serial signal from the rllrJJ line sensor into a parallel signal, a second serial transmitter that converts the parallel signal given to the sensor into a serial signal, and a second serial transmitter connected to the second serial transmitter,
The present invention is characterized in that an efficient transmission system is ensured by providing a monitor device having a processing circuit that gives instructions to the radiation sensor and processes the measurement results of the radiation sensor.

A fifth feature of the present invention is a radiation monitoring device, comprising: a radiation detector having a radiation lens, a sensor power source, and a radiation detector configured to give an instruction to the radiation sensor and process the measurement results of the radiation sensor. a monitoring device having a processing circuit and an M′m device for supplying power to the sensor power supply; and a connection line connecting the radiation detector and the monitoring device; A bypass filter provided between the radiation sensor and the connection line, and a low-pass filter provided between the sensor power source and the connection line, and the processing circuit and the connection line are provided in the monitor device. a bypass filter provided between the power supply device and the connection line, and a low-pass filter provided between the power supply device and the connection line, and the instruction and the measurement result are transmitted on the connection line via the bypass filter. The present invention is characterized in that a signal is transmitted and the power is transmitted through the low-pass filter, thereby ensuring an efficient transmission system.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on illustrative embodiments. FIG. 1 is a schematic diagram of this embodiment.

This radiation monitor is composed of N channels, and N1 [1 detectors 31-1 to 31-N are provided at the site. Each detector 31 has a serial transmitter 32, respectively. There is a fUal unit 34 near the N detectors 31.
is provided. This field unit 34 includes N serial transmitters 35-1 to 35-N and a digital serial transmitter 3.
7. N serial transmitters 35-1 to 35-
N4. It is connected to each of tN detectors 31-1 to 31-N by coaxial cables a3-1 to 33-N. On the other hand, the digital serial transmitter 37 connects N serial transmitters 3
5-1 to 35-N are connected by a connecting line 36.

The monitor device 39 is provided at an operation location remote from the site,
It has a digital serial transmitter 40 and a signal processing circuit 42. The digital serial transmitters 37 and 40 are connected by one optical transmission line 38. Digital serial transmitter 40
and the signal processing circuit 42 are connected by a digital bus 41,
Signal processing circuit 42 provides signals to alarm circuit 24 and recorder 25.

FIG. 2 shows the detailed configuration of the digital serial transmitter 40. The command from the digital bus 41 is the address register 4.
8 and a transmission data register 49, and the outputs of these registers are sent to the optical transmission line 38 via an optical driver 43 and an optical multiplexer 44. The address register 48 contains data indicating which setting value of which detector out of N detectors should be selected, and the transmission data register 49 contains data to be sent to the selected detector as serial data. Given. Optical driver 43
is made up of a photoelectric conversion element, which converts the applied electrical signal into an optical signal and supplies it to the optical multiplexer 44. On the other hand, the optical multiplexer 44 also receives data sent from the optical transmission line, and provides the received optical signal to the optical receiver 45. The optical receiver 45 is composed of a photoelectric conversion element, converts the applied optical signal into an electrical signal, and supplies it to the reception data register 50 via an AND gate 47. Also, register 4
The output signal of 8.49 is given to the transmission detection circuit 46, and when the transmission detection circuit 46 detects transmission, it outputs the AND gate 4.
7 gives a signal to close the gate. By providing the AND gate 47 in this way, even if the transmitted optical signal is passed through the optical multiplexer and given to the optical receiver 45, the AND gate 47 is provided.
Since the gate 47 is closed, no transmission data is given to the reception data register 50.

Figure 3 shows the detailed configuration of the field unit I-34.

The digital serial transmitter 37 has the same configuration as the portion shown by the broken line of the digital serial transmitter 40 in FIG.
The same reference numerals are given to each component, and description thereof will be omitted. The serial transmitter 35 includes a signal driver 53 and a signal receiver 54.
, transmission detection circuit 46, AND gate 47, low pass filter 55, bypass filter 56, and low voltage ff1l
Consists of 19. The digital serial transmitter 37 performs phase conversion between the optical signal transmitted through the optical transmission path 38 and the electrical signal transmitted through the connection line 36. The signal driver 53I3 and the signal receiver b4 perform transmission to and reception from the coaxial cable 33 via the bypass filter 56. The transmission detection circuit 46 and the eight Nl) gates 47 serve as input gates of the receiving section to prevent the transmitted signal from entering the receiving section during transmission. Further, a low voltage power source 19 is connected to the coaxial cable 33 via a low pass filter 55, and low voltage power is transmitted.

FIG. 4 shows the detailed configuration of the detector 31. The low voltage transmitted from the coaxial cable 33 is applied to the low voltage power supply 19 via a low pass filter 55.

Further, the signal driver 53 and the signal receiver 54 perform transmission to and reception from the coaxial cable 33 via the bypass filter 56. The transmission detection circuit 46 and the AND gate 47 serve as input gates of the receiving section so that the transmitted signal does not enter the receiving section during transmission. The received signal is applied to address register 68 and received data register 69. The detector address setter 66 is set with the address value of the detector. This address value is
For example, the number of the relevant detector from numbers 1 to N can be used. The decoder 67 compares this address value with the data given to the address register 68, and if they match, it determines that the detector in question has been selected, and gives operation commands (indicated by broken lines in the figure) to each device. . A high voltage is supplied to the radiation sensor 12 from a high voltage power supply 18 .

The output of the radiation sensor 12 is given to the discriminator 20 via the changeover switch 14. The discriminator 20 is also given the discrimination level set by the discrimination level setter 21, and gives a signal to the counter 61 when the output of the radiation sensor 12 is equal to or higher than this discrimination level. The counter 61 counts this signal and provides the counting result to the measurement data register 64. On the other hand, during calibration, the changeover switch 14 is switched by the changeover circuit 22, and the output of the calibration circuit 13 is given to the discriminator 20 instead of the output of the radiation sensor 12, thereby performing calibration. Further, the tube current of the output type 1f1 radiation sensor 12 of the high voltage power supply 18 and the discrimination level set by the discrimination level setter 21'c are determined by the multiplexer 62 and the A/D
It is applied to a diagnostic data register 65 via a converter 63. The data in the measurement data register 64 and the diagnostic data register 65 are sent to the coaxial cable 33 by the signal driver 53. In addition, a high voltage power supply 18, a switching circuit 2
2 and the discrimination level setter 21 are set conditions based on the contents of the reception data register 69.

Next, the operation of this embodiment will be described when the monitor device M39 sets various conditions for the detector 31, reads measured data, performs calculations, and outputs the results to the alarm circuit 24 and recorder 25. First, data necessary for measurement is sent from the signal processing circuit 42 to the digital serial transmitter 40 via the digital bus 41. Now, for example, if we consider the case of setting the identification level of the n-th detector, the address register 48 in FIG. are respectively given transmission data corresponding to the set identification level.

These data are converted into optical signals by the optical driver 43 and sent to the optical transmission line 38 via the optical multiplexer 44. This transmission data is in the form of digital serial data, and is sent in the order of detector address data and transmission data, for example, as shown in FIG. 5(a). At this time, since the AND gate 47 is closed as described above, no transmission data is sent to the reception data register 50.

As shown in FIG. 3, the optical signal transmitted through the optical transmission line 38 is applied to the optical receiver 45 via the optical multiplexer 44 in the field unit 34, where it is converted into an electrical signal. Furthermore, it is sent to the connection line 36 via the AND gate 47. The connection line 36 branches into N lines from here and transmits the same signal to N serial transmitters 35-1 to 35-N.

Within serial transmitter 35, the signal from connection 1136 is transmitted by signal driver 53 to coaxial cable 33. At this time, since the A N D gate 47 is closed, the transmitted data is not detected as received data. In addition,
Since a low voltage may be supplied to the coaxial pull 33 from one low voltage power supply, a low pass filter 55 and a bypass filter 56 are provided. That is, the transmission data passes through the bypass filter 56 and is output to the coaxial cable 33, but does not enter the low-voltage power supply 19 because it is blocked by the low-pass filter 55. Conversely, the low voltage is supplied to the coaxial cable 33 through the low-pass filter 55, but does not enter the signal driver 53 and signal receiver 54 because it is blocked by the bypass filter 56.

The N detectors 31-1 to 31-N each receive the same signal from the coaxial cables 331 to 33-N. This signal is received by a 13p3 receiver 54 via a bypass filter 56, as shown in FIG. When low voltage power is supplied instead of transmission data, it is supplied to the low voltage power supply 19 in the detector 31 via the low pass filter 55. Transmission data is applied to address register 68 and reception data register 69 via AND gate 47.

The detector address data applied to the address register 68 is compared in the decoder 67 with the detector address set by the detector address setter. If the two match, the specified device is set using the data given to the reception data register 9.

Now, as mentioned above, if we consider the case where the identification level of the nth detector is set, the address register 68 contains n.
The reception data register 69 receives detector address data specifying the discrimination level setting of the th detector, and data corresponding to the discrimination level to be set. Here, the detector addresses match only in the n-th detector 31-0 among the N detectors 31-1 to 31-N, and in the detector 31-n, the decoder 67 sends the identification level setter 21 A setting signal (indicated by a broken line in FIG. 11) is sent to the register, and the setting data of the reception data register is set in the identification level setter. Similarly, when the high-voltage power supply 18 is specified, the output type f (value) of the high-voltage power supply 8118 is set, and when the switching circuit 22 is specified, the switching state is set. When IIJ62 is specified, the A/D converter 63 provides the output voltage of the high voltage circuit 18, the tube current of the radiation lens 12, and the discrimination level set by the discrimination level setter 21 to the diagnostic data register 65. It will be done.

Next, the reading operation of measurement data will be explained. The radiation pulses detected by the radiation sensor 12 are counted by the counter 61 via the discriminator 20, and the result is given to the measurement data register 64. When the decoder 67 gives a read command to the address register 68 and the received data register 69 based on the data in the address register 68, the data in both registers are transmitted to the coaxial cable 33 by the signal driver 53. At this time, the function of the AND gate 47 prevents the transmitted data from being received in the opposite direction. This transmission data is in the form of digital serial data, and is sent in the order of detector diagnostic data and detector measurement data, for example, as shown in FIG. 5(b).

Transmission data from the nth detector 31-[1 is given to the field unit 34 through a coaxial cable 33-n. Here, the signal is transmitted from the serial transmitter 35-n to the digital serial transmitter 37, converted into an optical signal, and transmitted to the optical transmission line 38. Finally, this optical signal is received and processed by the monitor device 3, and then sent to the alarm circuit 24 and the recorder 25.
is output to.

The settings and readout for the n-th detector have been described above, but if this is repeated N times, it can be executed for all the detectors.

In addition, as shown in FIG. 6, by providing M digital serial transmitters 40 in the monitor device 39 and providing a field unit 34 for each, M x N detectors can be connected to one monitor device. be able to. This makes it possible, for example, to control a large number of detectors across buildings with one monitor device.

Also, without using a field unit, one
N digital serial transmitters 40-1 to 40-N are provided in the Tsunoshi unit @ 39, and N detectors 31-
1 to 31-N to N coaxial cables 33-1 to 33-
You can also connect directly with N. Such an example is
It is convenient and can be easily applied to the conventional example shown in FIG. In other words, by using one each of the existing multicore cables 16-1 to 16-N as the coaxial cables 33-1 to 33-N, the main cables can be installed without re-laying the coaxial cables. The invention is applicable.

(Effects of the Invention) As described above, according to the present invention, in a radiation monitoring method and a monitoring device, a serial signal is transmitted and received between a radiation detector and a monitoring device, and a signal for selecting a radiation detector is added to the serial signal. Since the signals are overlapped and the same signal line is also used as a power supply line, an efficient transmission system can be ensured.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the radiation monitoring device according to the present invention, FIG. 2 is a detailed configuration diagram of a digital serial transmitter of the device shown in FIG. 1, and FIG. 3 is a diagram of the site shown in FIG. FIG. 4 is a detailed configuration diagram of the unit, FIG. 4 is a detailed configuration diagram of the detector shown in FIG. 1, FIG. 5 is a time chart showing an example of a serial signal transmission pattern according to the present invention, and FIGS. Schematic configuration diagrams of other embodiments of the present invention, FIGS. 8 and 9
The figure is a schematic configuration diagram showing an example of a conventional radiation monitor device. 11...Detector, 12...tlIrJ4-wire sensor,
13... Calibration circuit, 14... Changeover switch, 15.
...Output h buffer, 17...Monitor device, 16...
Multicore cable, 18... High voltage power supply, 19... Low voltage power supply, 20... Discriminator, 21... Identification level setter,
22...Switching circuit, 24...Alarm circuit, 25...
31...Detector, 32...Serial transmitter, 33...Coaxial cable, 34...Field unit, 35...Serial transmitter, 36...Connection line, 37
...Digital serial transmitter, 38...Optical transmission line,
39... Monitor device, 40... Digital serial transmitter, 41... Digital bus, 42... Signal processing circuit, 43... Optical driver, 44... Optical multiplexer, 45... Optical Receiver, 46... transmission detection circuit,
47...AND gate, 48...Address register, 49...Transmission data register, 50...Reception data register, 53...Signal driver, 54...Signal receiver, 55...Low pass filter , 56... Bypass filter, 61... Counter, 62... Multiplexer, 63... A/D converter, 64...
Measurement data register, 65...Diagnostic data register,
66...Detector address setter, 67...Decoder, 68...Address register, 69...Receive data register. Applicant's agent Kiyoshi Inomata Figure 3 Figure 5

Claims (1)

[Claims] 1. A radiation monitoring method in which N radiation detectors are monitored by one monitor device, wherein the N radiation detectors and the monitor device are each connected by N signal lines. connecting the radiation detector and the monitoring device, respectively providing a serial transmitter in the radiation detector and the monitoring device, and transmitting a serial signal on the N signal lines to perform signal transmission between the radiation detector and the monitoring device. A radiation monitoring method characterized by: 2. A radiation monitoring method in which N radiation detectors are monitored by one monitor device, the N radiation detectors and the monitor device being connected by a signal line, and the N radiation detectors being connected to the N radiation detectors from the monitor device. One of the radiation detectors in
When giving a command signal to one predetermined detector, in addition to the command signal, a detector address signal for selecting the predetermined detector is sent to the N radiation detectors via the signal line. the N radiation detectors that received the transmission signal determine whether or not they have been selected by the detector address signal, and only the radiation detectors that have determined that they have been selected have the A radiation monitoring method characterized in that a command signal is enabled. 3. N detectors each having a radiation sensor and a first serial transmitter that converts a parallel signal output of the radiation sensor into a serial signal and converts a serial signal input to the radiation sensor into a parallel signal; , N serial signal transmission lines, one end of which is connected to each of the first serial transmitters of the N detectors, and one end of which is connected to each other end of the N serial signal transmission lines, and the radiation N second serial transmitters that convert a serial signal from the sensor into a parallel signal and convert the parallel signal given to the radiation sensor into a serial signal; A radiation monitoring device comprising: a processing circuit that gives instructions to a radiation sensor and processes measurement results of the radiation sensor. 4. N detectors each having a radiation sensor and a first serial transmitter that converts a parallel signal output of the radiation sensor into a serial signal and converts a serial signal input to the radiation sensor into a parallel signal; , N serial signal transmission lines, one end of which is connected to each of the first serial transmitters of the N detectors, and the other end of the N serial signal transmission lines connected to one transmission line. a field unit connected to one end of the transmission line; and a second field unit connected to the other end of the one transmission line, which converts a serial signal from the radiation sensor into a parallel signal, and converts a parallel signal given to the radiation sensor into a serial signal. a second serial transmitter; and a processing circuit connected to the second serial transmitter to give instructions to the radiation sensor and process the measurement results of the radiation sensor. Features of the radiation monitor device. 5. The transmission line is an optical transmission line, the field unit performs mutual conversion between the electrical signal transmitted on the serial signal transmission line and the optical signal transmitted on the transmission line, and the second serial transmitter converts the optical serial signal into an electrical parallel signal. 5. The radiation monitor device according to claim 4, wherein the radiation monitor device converts the radiation into a signal. 6. A radiation detector having a radiation sensor and a sensor power supply; a processing circuit that gives instructions to the radiation sensor and processes measurement results of the radiation sensor; and supplies power to the sensor power supply. A radiation monitor device comprising: a power supply device; a connection line connecting the radiation detector and the monitor device; the radiation detector is connected between the radiation sensor and the connection line. a bypass filter provided between the sensor power source and the connection line;
The monitoring device includes a bypass filter provided between the processing circuit and the connection line, and a low-pass filter provided between the power supply device and the connection line, and the connection A radiation monitoring device characterized in that the signal of the instruction and the measurement result is transmitted through the bypass filter, and the power is transmitted through the low-pass filter.