JPH03243824A - Measuring instrument - Google Patents

Abstract

PURPOSE:To record information on an amplification factor automatically and to facilitate its read by grouping every two different channels and generating DC signals of corresponding levels alternately according to switching information on the degree of amplification of the detection output of a corresponding channel. CONSTITUTION:Detectors 1 and 2 are for channels 1 and 2 and converters 30 and 40 for the systems of the channels 1 and 2 have variable gain amplification parts respectively, and controls the range switching of the variable gain amplification parts stepwise according to the input levels of detection signals from the detectors 1 and 2 and outputs range output signals 6 (6a and 6b) as range information or amplification factor information generated with a range switching signal. For example, when a nuclear power plant is actuated, the level is small, so the amplification factor is maximized and switched to a one- stage lower range in a stage wherein an amplified signal nearly reaches a saturation level, thus varying the amplification factor. This range output signal 6 is supplied to a recorder 5, where the signal is recorded by utilizing a channel for range information recording different from channels for recording the output signals of the detectors 1 and 2.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) It is something that

(Prior art) For example, in a nuclear reactor, in order to know the operating status of the reactor,
It is necessary to understand the situation inside the reactor, and for that purpose it is necessary to accurately know the neutron flux near the reactor core. For this purpose, a neutron flux detector is placed close to or inside the reactor core to measure the amount of neutrons.

A conventional method of a neutral flux measuring device will be explained with reference to FIG. Although detection is performed at a plurality of points, two channels □ will be explained here as an example.

As shown in FIG. 7, the conventional neutron flux measurement device includes a detector 1 (for the second channel) and a detector 2 (for the second channel), which detect the neutron flux in the reactor and output a detection signal corresponding to the amount. 2
channel) and a variable gain amplifying section, which amplifies the detection signal of the detector 1, and also amplifies the variable gain amplifying section in stages according to the human power level of the detection signal from the detector 1. It has a converter 3 (for the first channel) that performs range switching control and other necessary processing in order to switch the amplification factor, and a variable gain amplification section, which amplifies the detection signal of the detector 2 and also performs detection. a converter 4 (for the second channel) that performs range switching control and other necessary processing to switch the amplification factor of the variable gain amplifier stepwise in accordance with the human power level of the detection signal from the device X; It consisted of a pen recording type recorder 5 which receives the output signals of these converters 3 and 4 and records them.

In conventional equipment with such a configuration, when a nuclear reactor plant is started up, the amount of neutrons gradually increases as nuclear fission within the reactor progresses, so the output signals of detectors 1 and 2 that detect the amount of neutrons also increase. . The output signals of these detectors 1 and 2 are recorded as waveforms on recording paper by a pen recording type recorder 5, but since it is analog recording, the level is set so that the changes can be clearly seen. When the output signal level of detectors 1 and 2 becomes small, the swing is increased, and when the output signal level of detectors 1 and 2 becomes large, the recorder 5 is exceeded, so the range is changed according to the change in the signal power level to reduce the signal amplification factor. do.

For this purpose, the amplification sections in the converters 3 and 4 use variable gain amplifiers (i.e., variable gain amplifiers).
It has a function to automatically switch the gain (amplification factor) according to the current range by range switching control.

When starting up a nuclear reactor plant, since the level is small, the amplification factor is set to the maximum, and when the amplified signal reaches near the saturation level, the amplification factor is switched to the next lower range, and the amplification factor is amplified with this amplification factor. When the input signal reaches near the saturation level, the amplification factor is switched to the next lower range, and so on, the range is changed and the amplification factor is varied according to the level of the input signal.

Since the measurement range is wide ranging from 0 to about 5 digits, specifically, the range is switched by about n times and recorded on the recording paper on a linear scale.

Range switching is performed by a range switching signal, which is generated by a range control circuit provided in each converter 3, 4, respectively.

Although the range switching is automated, the recorder 5 cannot record the range switching information on the converters 3 and 4 side.On the other hand, when there is a range switching, the waveform drawn on the recording paper of the recorder 5 Since a falling edge occurs, this is used as a guideline for reading as the range switching point.

(Problem to be Solved by the Invention) In a nuclear reactor plant, the amount of neutrons is monitored in order to know the situation inside the reactor. When the nuclear reactor plant is started, the amount of neutrons gradually increases as nuclear fission within the reactor progresses, so the neutron detection output signal also increases. Monitoring is performed by recording the waveform of this neutron detection output signal on a recording paper using a pen recording type recorder, but in order to clearly see the changes, when the level is low, the pen is swung sharply, and the neutron detection output signal is As the signal level increases,
The range is switched according to changes in the signal human power level to reduce the signal amplification factor.

For this reason, the amplification section in the monitor device uses a variable amplification factor, and is equipped with a function of automatically changing the range in order to change the gain.

In this way, range switching is automated, but the recorder cannot record range switching information on the converter side, so when a range switch occurs, the waveform drawn on the recorder's recording paper will show a falling change. I know that a range change has occurred when I see this occur. When starting up a nuclear reactor plant, range switching is performed step by step.
Since the signal is switched toward a higher range, the waveform is read by determining which range it is in depending on how many times it falls.

Therefore, reading becomes inefficient and there is a risk of misreading.

Therefore, the object of the present invention is to provide a measurement method for monitoring, which amplifies the detection output by changing the amplification degree according to the detection output level, and records the amplified output with an analog recording recorder. An object of the present invention is to provide a measuring device that can automatically record information regarding the amplification factor at that time in the recorded contents of a recorder in a system, thereby making it easy to read.

[Configuration of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows. That is, it has detection means for multiple channels, and amplifies the detection output by switching the amplification degree of the detection output according to the detection output level of each detection means, and records the amplified output with an analog recording recorder. In such a measuring device, two different channels are grouped, and a DC signal of a level corresponding to the switching information is generated according to the switching information of the amplification degree of the detection output of the corresponding channel. A range signal generating means is provided which generates a signal by alternately switching two channels with different polarities, and the output signal of the range signal generating means is output from the detection output using a common range information recording channel assigned to each group. The configuration is such that recording is performed in parallel using the recorder.

(Function) In such a configuration, the range signal generating means generates, for each channel, a DC signal at a level corresponding to the switching information in accordance with the switching information of the amplification degree. Then, the output signal of each channel outputted by the range signal generating means is recorded by the recorder in parallel with the detection output of the detection chiaki corresponding to the channel. The detection means has multiple channels, and the range signal generation means groups two different channels out of each channel, and responds to each switching information according to the switching information of the amplification degree of the detection output of the corresponding channel. DC signals of different levels are generated by alternately switching two channels with different polarities, and the output signal of this range signal generating means is sent to a common range information recording channel assigned to each group in the recorder. Given.

Therefore, even if two channels of signals are manually input using a shared range information recording channel, one channel will be placed in the positive polarity side of the recording area of the recording channel.
On the other channel, a waveform at a level corresponding to the current range will be recorded on the negative polarity side, and range information for two channels will be recorded separately by one channel of the recorder.

Therefore, according to the present invention, in a measurement system for a monitor, the detection output is amplified by changing the amplification degree according to the detection output level, and the amplified output is recorded by an analog recording recorder. Information about the amplification factor at that point can be automatically recorded in the recorded contents of the recorder, and moreover, it is possible to record information for two channels of the detection system per channel of the recorder, and the recorded information can be distinguished by channel. , it is possible to provide a measuring device in which the recorded contents of each detection system can be easily read.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Here, the operation of a nuclear reactor plant monitoring device at the time of reactor startup will be explained as an example.

In addition, although the detection system will be explained as two systems, this is the basic system, and even if there are more than one channel, two systems will be used.
The idea of the present invention can be applied by grouping each channel.

In FIG. 1, numerals 1 and 2 are detectors for detecting the amount of neutrons, which detect the neutron flux in the reactor and output a detection signal corresponding to the amount. Detector 1 is channel 1 (ch, 1), detector 2 is channel 2 (c
h, 2). 30 and 40 are converters, converter 30 is for channel 1 (ch, 1) system; converter 40 is for channel 1 (ch, 1) system;
is for channel 2 (ch, 2) system, and each has a variable gain amplification section, which amplifies the detection signal of the detector for the own system among the detectors 1.2, and also Range switching control is performed to switch the amplification factor of the variable gain amplifier stepwise according to the input level of the detection signal from the device, and range information or amplification factor information is generated from the range switching signal at this time. Range output signal 6
It has the function of outputting to the outside and performs other necessary processing.

Range switching control is performed by a range switching signal, which range switching signal is generated within each converter 30, 40.

Reference numeral 5 designates a pen recording type recorder which receives and records the amplified output signals (monitor signals) 3a, 4a of the detection signals outputted from these converters 30, 40, and also records the range output signal 6.

The range output signal 6 in the converter 30.40 is obtained by providing range signal generation circuits 21a, 21b in the converter 30.40 as shown in FIG. The range signal generation circuits 21a and 21b shown in FIG. 3 are an example; the former is for one channel, and the latter is for two channels.

The range signal generation circuits 21a and 21b have a configuration in which a plurality of resistance elements 22a to 22n are connected in series as shown in the figure, and the output of a DC constant voltage source 23 is applied to both ends of the series resistance.

As a result, the resistance elements 22a to 22n are used as voltage dividing resistors, and the output of the constant voltage source 23 is connected to the resistance elements 22a to 22n.
The configuration is such that the output is obtained by dividing the voltage. Resistance element 22a
For example, the divided voltage output by ~22n is positive polarity for channel 1 system, and negative polarity for channel 2 system, so that the DC constant voltage source 23 for channel 1 system has its ground side negative In addition, for channels and two systems, connect the ground side as the positive terminal.

In order to be able to selectively obtain each divided voltage output by this voltage dividing resistor, switches 24a to 24m are provided at each voltage dividing point of the voltage dividing resistor, and the output is obtained through this switch. so that each switch 24a to 24
Considering the relationship with the level of the divided voltage output obtained through the switch, m is the switch 24 that can obtain the maximum level output when the range switching signal specifies the maximum range.
Only the switch a is closed, and when the next range is specified, only the switch 24b, which provides an output one step lower than the maximum level, is closed, and when the minimum range is specified, only the switch 24m, which provides an output of the minimum level, is closed. composition.

As a result, the range signal generating circuit 21 closes the switch determined by the range switching signal in synchronization with the output of the range switching signal for switching the amplification degree, and the range output signal 6 corresponding to the currently specified range can be obtained.

25 is an output switch for controlling the manual input of the range output signal 6 to the recorder 5;
Since 1 is designed to form a pair for two systems, here, one system will be represented by reference numeral 21a, and the other system will be represented by reference numeral 21b. In addition, if it is necessary to explain the range output signal 6 separately for each channel, please use c
6a for h and l.

The channel for channel 2 will be expressed as 6b.

One of the range signal generation circuits 21a and 21b is ch,
One is for channel 2, and the other is for channel 2, and since the two systems are paired, this output switch 2 can be used to select either system.
5 is a range signal generation circuit 21a for each channel.
, 21b, and by closing the output switch 25 of a desired system, the range output signal 6a or 6b of the closed system can be obtained.

The recorder 5 records this range output signal 6a or 6b by giving it to the range information recording channel. Although the range information recording channels may be separated into ch.1 and ch.2, the number of used channels is saved by sharing two channels in one channel.

This device with such a configuration inputs the output signals of the detectors 1 and 2 to the converters 30 and 40 of the corresponding channels, amplifies them, and applies them to the recorder 5 to drive the pen.
Record the waveform on recording paper.

When starting up a nuclear reactor plant, as the nuclear fission inside the reactor progresses, the amount of neutrons gradually increases.
The output signal of will also increase. The output signals of these detectors 1 and 2 are recorded in waveforms on recording paper by a pen recording type recorder 5, but since it is an analog recording, the swing is large when the level is small so that the change can be clearly seen. death,
If the level of the output signal from the detector 1.2 increases, the recorder 5 will be overshot, so the range is changed according to the change in the input level of the signal so as to reduce the signal amplification factor.

For this purpose, the amplification sections in the converters 30 and 40 use variable amplification factors (ie, variable gain amplifiers), and are equipped with a function to automatically switch the gain (amplification factor).

When starting up a nuclear reactor plant, since the level is small, the amplification factor is set to the maximum, and when the amplified signal reaches near the saturation level, the amplification factor is switched to the next lower range, and the amplification factor is amplified with this amplification factor. When the signal reached near the saturation level, the amplification factor is switched to the next lower range, and so on. Go.

Since range switching is automated, the converter 30.4 is configured to switch to the range that provides the optimum amplification depending on the signal level manually input from the detector 1.2.
0, a self-use range switching signal is generated, but the range signal generation circuit 21a +' 21b closes the switch determined by the range switching signal in synchronization with this self-use range switching signal output, and outputs the range corresponding to the current specified range. A range output signal 6 having a signal level is output.

This range output signal 6 is given to the recorder 5, and the detector 1
, 2 is recorded on the recorder 5 using a range information recording channel different from the output signal recording channel.

Since the range information recording channel is shared by each bare unit, the range signal generation circuit 21a.

Each output switch 25 of 21b is alternately controlled to be turned on/off at a fast and appropriate rate by the control means of converter 30, 40 so as not to be turned on at the same time. Since one of the range signal generation circuits 21a and 21b has a positive polarity and the other has a negative polarity, the pen of the range information recording channel is centered on the center 0 of the recording area of the pen, one is on the 10th area side, and the other is on the 10th area side. In this case, the range output signal is recorded as a waveform in one area.

Since the range output signal 6 is a signal with a signal level corresponding to the current designated range, as shown in Figure 2, the range recording on the recorder chart paper (recording paper) increases as the range increases (amplification factor waveforms 6a (for ch, 1), 8b (for ch, 2) that change stepwise
recorded as

Moreover, since this is compatible with a range, the amplified output signal (monitor signal) of the recorded detector 1.2 3a,
It is possible to see at a glance which range position the waveform 4a is at.

By the way, normally, a recorder for monitoring the activation region in an atomic couplant uses a two-pen recorder to manually monitor two channels of monitor signals.

When performing range recording, it is necessary to perform range recording for each monitor signal separately, so originally it would be necessary to use 4-pen recording, but since it would be expensive, the above example was adopted and the general 3-pen recording was used. This can be achieved with a meter.

Here, the range signal generation circuit 21a of FIG.

Another configuration example of 21b is shown in FIG.

FIG. 4 shows a range signal generation circuit 21a, 21b including a distribution device for range output signals.

In the figure, numerals 41 and 42 are change detection circuits that each receive an input signal and detect a change in level of the human input signal.The change detection circuit 41 is for the A channel, and the change detection circuit 42 is for the B channel. Change detection circuits 41 and 4
2 detects a change in the input signal and generates a short-time pulse (switching signal 41a).

42a).

43 and 44 are voltage conversion circuits that each receive an input signal and convert it into a voltage with a predetermined peak value determined according to the level of the input signal; voltage conversion circuit 43 is for the A channel, and voltage conversion circuit 44 is for the B channel. It is for use.

Note that one of the voltage conversion circuits 43 and 44 outputs a positive voltage, and the other outputs a negative voltage.

45 is a changeover switch for output selection, and has three changeover contacts. The first contact 45a is connected to the output side of the voltage conversion circuit 43, the second contact 45b is grounded, and the third
The contact 45c is connected to the output side of the voltage conversion circuit 44, and the changeover switch 45 is switched to the first contact 45a by the output of the change detection circuit 41 (switching signal 41a), and the output of the change detection circuit 42 (switching signal 41a) switches the changeover switch 45 to the first contact 45a. 42a), the changeover switch 45 is switched to the third contact 45c, and either the change detection circuit 41 or 42 receives the changeover signal 41a,
When there is no output 42a, the state is switched to select the second contact 45b.

The configuration is such that the output via the changeover switch 45 is manually input to the third channel (C channel) of the recorder 5.

In this device having such a configuration, a range switching signal related to the monitor signal for the A channel is input to the change detection circuit 41, and a range switching signal related to the monitor signal for the B channel is input to the change detection circuit 42. There is. When there is a change in the input signal (range switching signal), each of the change detection circuits 41 and 42 detects the change and generates a short-time pulse (switching signal 41a, 42a). At the same time, the voltage conversion circuits 43 and 44 are manually input with the range switching signals of the corresponding channels, and output voltage signals corresponding to the levels, one with positive polarity and the other with negative polarity.

When receiving a short-time pulse (switching signal 41a) from the change detection circuit 41, the changeover switch 45 selectively connects the first contact 45a while receiving the pulse, and then outputs a short-time pulse (switching signal 41a) from the change detection circuit 42. Upon receiving the signal 42a), the selector switch 45 switches the third
The second contact 45c is selectively connected, and when there is no short-time pulse, the second contact 45b is selectively connected.

Therefore, if the range switching signal of the monitor signal for the A channel changes, the selector switch 45 is switched to the first contact 45a while receiving the pulse, and if the range switching signal of the monitor signal for the B channel changes. , while the selector switch 45 receives the pulse, the third contact 45c
and in other states, it is switched to the second contact 45b.

As a result, if the range switching signal changes, a range recording signal is input to the third channel (C channel) of the recorder 5 at the changed channel polarity and range level, and when there is no change, the signal is at zero level. A signal for recording the range is manually input to the C channel of the recorder 5, and range information corresponding to the range switching signal is recorded on the recording paper C5P as shown by C in FIG.

The polarity of range information recording is changed depending on the channel, and the contents of the range are displayed according to the height.When the range changes, the level of the monitor signal drops suddenly on the changed channel, so the position, including the relationship with this, Since the timing can be matched, the signal for range recording is C of recorder 5.
Even if it is recorded using only channels, it is possible to read the range information at any given time depending on the channel.

This makes it possible to automatically record monitor signals A and B for two channels together with range information for each channel using a three-pen recorder.

Also, in the case of a 5- or 3-color recorder, for example, if the A channel uses a red pen and the B channel uses a green pen, the range recording section of the recording paper (the area used for range recording)
is printed in red RZ on the one side bordering the center and green GZ on the other side. Then, by placing the zero position of the C channel pen at the center position and shaking the pen, the range recording of the channel where the range change occurs will be recorded toward the color area of that channel, as shown in Figure 6. Even if the color of the C channel pen is blue, the range recording display can be visually and sensually recognized by the area and the printed color of that area.

In this way, this device has detection means for multiple channels, and amplifies the detection output by switching the amplification degree of the detection output according to the detection output level of each detection means, and records the amplified output for analog recording. In a measuring device configured to record data using a meter, two different channels are used.
A range signal generating means that divides each channel into a group and generates a DC signal of a level corresponding to each switching information by alternating two channels with different polarities according to the switching information of the amplification degree of the detection output of the corresponding channel. The output signal of the range signal generating means is recorded by the recorder in parallel with the detection output using a shared range information recording channel assigned to each group. .

Then, the range signal generating means generates a DC signal for each channel at a level corresponding to the switching information according to the switching information of the amplification degree, and the output signal for each channel outputted from the range signal generating means corresponds to the switching information of the said channel. is recorded by the recorder in parallel with the detection output of the detection means.

The detection means has multiple channels, and the range signal generation means groups two different channels out of each channel, and responds to each switching information according to the switching information of the amplification degree of the detection output of the corresponding channel. DC signals of different levels are generated by alternately switching two channels with different polarities, and the output signal of this range signal generating means is sent to a common range information recording channel assigned to each group in the recorder. Given.

Therefore, even if two channels of signals are input using a shared range information recording channel, one channel will be placed in the positive polarity side of the recording area of the recording channel.
On the other channel, a waveform at a level corresponding to the current range will be recorded on the negative polarity side, and range information for two channels will be recorded separately by one channel of the recorder.

In this way, information regarding the amplification factor at that point in time can be expressed in the height of the recording waveform and automatically recorded in the recording content of the recorder that records the detection output signal in each detection system, and the two channels The minutes are assigned to a common recording channel in the recorder, and the polarity of the waveform of the range information is different for each of the two channels, so that they are recorded separately. It becomes possible to distinguish and automatically record the range information of many channels with a small number of recording channels, and it becomes possible to easily read the state of the detection output of the ax detection system.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications within the scope of the gist thereof.For example, the above embodiments may be applied to a nuclear reactor plant. Although the explanation has been given as an example, it goes without saying that the invention is not limited to this.

[Effects of the Invention] As detailed above, according to the present invention, the detection output is amplified by changing the amplification degree according to the detection output level, and the amplified output is recorded by an analog recording recorder. In the measurement system for the monitor, it is possible to automatically record information about the amplification factor at that point in the recorded contents of the recorder, and moreover, it is possible to record information for the detection system channel per channel of the recorder, and the recorded information can be distinguished by channel, and it is possible to provide a measuring device in which the recorded contents of each detection system can be easily read.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an example of recording on recording paper by the device of the present invention, and FIG. 3 is a diagram showing an example of the configuration of a range signal generation circuit used in the device of the present invention. FIG. 4 is a block diagram showing another configuration example of the range signal generation circuit according to the present invention, FIG. 5 is a diagram showing an example of recording paper recording in the apparatus of the present invention, and FIG. FIG. 7 is a block diagram showing an example of the configuration of a conventional device. 1.2...Detector, 5...Recorder, 6, 6a,
fib...range output signal, 30.40...converter, 21a, 21b...range signal generation circuit, 22
a to 22n... Resistance element, 23... Constant voltage source, 24
a~24m...switch, 25...output switch,
41, 42... Change detection circuit, 43.44... Voltage conversion circuit, 45... Changeover switch.

Claims (1)

[Claims] It has detection means for a plurality of channels, and the amplification degree of the detection output is switched and amplified according to the detection output level of each detection means, and the amplified output is used as a recorder for analog recording. In a measuring device configured to record data using a method, two different channels of each channel are grouped, and a level corresponding to each switching information is set according to switching information of the amplification degree of the detection output of the corresponding channel. A range signal generating means is provided which generates a DC signal by alternately switching between two channels with different polarities, and the output signal of the range signal generating means is generated using a shared range information recording channel assigned to each group. A measuring device characterized by having a configuration in which recording is performed by the recorder in parallel with the detection output.