JP2001108750A - Radiation pulse transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress attenuation and distortion of a radiation pulse waveform on a transmission path and superposing of a noise thereon, and to efficiently transmit digitally only an objective signal. SOLUTION: A radiation pulse transmitting device which digitizes the pulse waveform input from a radiation detector to be transmitted and which conducting waveform regeneration in a measuring system is provided with a circuit 2 for sampling a signal level of the pulse waveform at prescribed period, a trigger level setting circuit 3 set with a trigger level for determining whether a sampled signal is transmitted as a waveform regenerating data or not, a comparison circuit 4 for comparing the sampled signal with the trigger level to output the sampled signal exceeding the trigger level for a fixed time, an A/D converting circuit 5 for digital-converting an output signal from the comparison circuit 4, a memory circuit 6 for storing a converted digital signal for a time required for the waveform regeneration, and a transmission circuit 7 for transmitting information stored in the memory circuit 6 to the measuring system in a lump.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation pulse transmitting apparatus for digitizing a radiation pulse signal obtained by shaping an output signal of a radiation detector into a waveform and transmitting the digital signal to a measurement system to reproduce a waveform. .

[0002]

2. Description of the Related Art A system for detecting radiation and measuring its intensity with a counter or counter, a system for analyzing a radiation energy spectrum, or a system for classifying a signal or a noise from a radiation signal waveform is used. ,
A general method is to transmit an analog signal from a radiation detector to a radiation measurement system via a coaxial cable.

However, this method may cause measurement disturbance due to wave height attenuation, waveform distortion, and noise superimposition due to the transmission distance.

Therefore, when transmitting an analog signal output from a radiation detector to a measurement system, a radiation pulse signal obtained by shaping an analog waveform from the radiation detector is digitized, and the digital signal is transmitted to the measurement system. A radiation pulse transmission device that transmits and reproduces a waveform is employed.

[0005]

However, this radiation pulse transmission device has a problem in that the transmission efficiency of radiation pulses is low because it is digitized and transmitted in a downstream manner regardless of signal conditions.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to suppress attenuation, distortion, and superposition of noise on a transmission line of a radiation pulse waveform, and to efficiently digitally transmit only a target signal. It is an object of the present invention to provide a radiation pulse transmission device capable of performing the above.

[0007]

According to the present invention, in order to achieve the above object, a radiation pulse transmitting apparatus is constituted by the following means.

According to a first aspect of the present invention, a pulse waveform input from a radiation detector is digitized and transmitted to a measurement system, and the measurement system converts a received digital signal into an analog signal to reproduce the waveform. In the pulse transmission device, sampling means for sampling the signal level of the pulse waveform at a predetermined cycle, and setting means for setting a reference value as to whether to transmit a signal sampled by the sampling means as waveform reproduction data Comparing means for comparing the sampled signal with a reference value set by the setting means and outputting a sampling signal exceeding the reference value for a certain period of time; and converting the sampling signal output from the comparing means into a digital signal. Digital converting means, and a digital signal converted by the digital converting means. Storage means for a predetermined time storage required shape reproduction, in which a transmission means for transmitting to said measuring system collectively the information necessary waveform reproduction stored in the storage means.

According to a second aspect of the present invention, in the radiation pulse transmitting apparatus according to the first aspect, a pulse signal input to the sampling means is applied to a continuous pulse having a length exceeding a predetermined transmission time. A multi-stage storage unit for storing the data digitally converted by the digital conversion unit in a time-series manner; and a transfer control unit for sequentially transferring and controlling the data stored in the multi-stage storage unit to the storage unit. .

According to a third aspect of the present invention, in the radiation pulse transmitting apparatus according to the first or second aspect, data of a number necessary for waveform reproduction is extracted from the digital data stored in the storage means. Transmission data extraction means for outputting to the digital transmission means, and in the measurement system, a digital data sequence for deriving a radiation pulse waveform from the digital data received by the reception means and the radiation pulse adaptation function and reproducing the waveform is provided. It is provided with a waveform function calculating means for outputting.

According to a fourth aspect of the present invention, in the radiation pulse transmitting apparatus according to the first aspect of the present invention, a maximum value is extracted from digital data serving as a target waveform stored in the storage means and transmitted to the transmission means. Waveform data output control for selecting a digital data string for reproducing the target waveform from the maximum value digital data received by the receiving means in the measurement system, and outputting the selected information; Means are provided.

According to a fifth aspect of the present invention, in the radiation pulse transmitting apparatus according to the second aspect, it is determined whether there is a time-series change in data stored in the multi-stage storage means in a time-series order. A waveform determining means for transferring data to the storage means when there is a series change is provided.

According to a sixth aspect of the present invention, in the radiation pulse transmitting apparatus according to the first aspect, when it is determined by the comparing means that the sampling signal has exceeded a reference value, the setting is performed by a command from the comparing means. Auxiliary storage means for digitizing the signals sequentially sampled by the digital conversion means and storing them for a certain period of time regardless of the reference value set in the means, wherein the sampling signal is used to store the reference value set in the setting means. If there is more input,
Upon receiving a command from the comparing means, data before the input exceeding the reference value stored in the auxiliary storage means is transferred to the storage means, and the data is also transmitted collectively.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the radiation pulse transmitting apparatus according to the present invention.

In FIG. 1, reference numeral 1 denotes a signal input circuit for inputting a radiation voltage pulse signal output from a radiation detector;
Reference numeral 2 denotes a sampling circuit that samples the radiation voltage pulse signal of the level processed by the signal input circuit 1 at a predetermined period, and 3 denotes a trigger voltage Vtr for determining whether to transmit the sampled data as waveform reproduction data. , The trigger level setting circuit 4 compares the voltage sampled by the sampling circuit 2 with the trigger voltage Vtr set in the trigger level setting circuit 3,
This is a sampling signal comparison circuit that outputs a sampling voltage for a fixed time when the sampling voltage exceeds the trigger voltage Vtr.

Reference numeral 5 denotes an A / D converter for digitally converting a sampling voltage value output from the sampling signal comparison circuit 3, 6 a memory circuit for storing a signal digitally converted by the A / D converter 5, Reference numeral 7 denotes a transmission circuit for transmitting the digital signal stored in the memory circuit 6.

On the other hand, a receiving circuit 9 receives a digital signal transmitted from the transmission circuit 7 via the transmission line 8 in a predetermined procedure, and performs decoding and error detection. D / A to convert data to analog
A converter 11 is a waveform smoothing filter for smoothing the analog signal converted by the D / A converter 10, and 12 is a signal output circuit for outputting an output signal of the waveform smoothing filter 11.

Next, the operation of the radiation pulse transmitting apparatus configured as described above will be described with reference to the waveform diagram shown in FIG.

When a radiation voltage pulse is generated from a radiation detector (not shown), a radiation voltage pulse signal having a maximum peak value Vmax is efficiently input to the signal input circuit 1,
The voltage pulse signal is sampled by the signal sampling circuit 2 at a period Δt at which a sample sufficient to reproduce the target voltage pulse signal is obtained.

The data sampled by the signal sampling circuit 2 is input to a sampling signal comparison circuit 4 where the trigger voltage Vtr set in the trigger level setting circuit 3 and the sampled voltage data are output. Is compared with When the sampling voltage value exceeds the trigger voltage value, the sampling signal comparison circuit 4 opens the gate to the next circuit for a fixed time T and outputs the sampling voltage value V (t). When this sampling voltage value V (t) is input to the A / D conversion circuit 5, the A / D conversion circuit 5
An analog voltage value of max or less is converted into a digital value, and the data is stored in the memory circuit 6. In this case, data is stored in the memory circuit 6 for T seconds after the trigger is detected.

When the data stored in the memory circuit 6 is taken into the digital transmission circuit 7, the digital transmission circuit 7 adds an error detection bit to the data, performs transmission path coding, and then determines the data. The data is transmitted to the transmission line 8 according to the procedure.

On the other hand, the digital receiving circuit 9
The signal is received according to a predetermined procedure, and after decoding and error detection are performed, the signal is input to the D / A conversion circuit 10. This D
The A / A conversion circuit 10 performs analog conversion with a period Δt in the order of time series in the data length when data is digitized on the transmission side, and converts the analog signal into a waveform smoothing filter 11.
To enter.

In the waveform smoothing filter 11, D / A
It compensates for the discontinuity of the reproduced waveform of the analog signal obtained by the conversion circuit 10, converts it into a continuous waveform, and inputs it to the signal output circuit 12. The signal output circuit 12 outputs the output signal from the waveform smoothing filter 11 through a buffer amplifier with impedance matching with an output destination device.

According to the radiation pulse transmitting apparatus having such a configuration, it is possible to perform efficient radiation pulse transmission eliminating the effects of waveform attenuation, distortion, and noise.

FIG. 3 is a block diagram showing a second embodiment of the radiation pulse transmitting apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. State.

In the second embodiment, as shown in FIG. 3, data T / D converted by the A / D conversion circuit 5 is fetched, and the time Ttrans for transmitting and reproducing the data stored in the memory circuit 6 is obtained. A short time ΔT between (Ttrans >> Δ
When the pulse data to be transmitted in T) is recognized, the continuous pulse memory circuit 13 capable of storing the same for n times (n is an arbitrary integer), and the continuous pulse memory circuit 1
3 and a continuous pulse transmission control circuit 14 for controlling the timing of sending data stored in the memory circuit 6 to the memory circuit 6. Other configurations are the same as those in FIG.

Next, the operation of the radiation pulse transmitting apparatus configured as described above will be described with reference to the waveform diagram shown in FIG.

When a radiation voltage pulse is generated from a radiation detector (not shown), a radiation voltage pulse signal having the maximum peak value Vmax is efficiently input to the signal input circuit 1,
The voltage pulse signal is sampled by the signal sampling circuit 2 at a period Δt at which a sample sufficient to reproduce the target voltage pulse signal is obtained.

The data sampled by the signal sampling circuit 2 is input to a sampling signal comparison circuit 4 where the trigger voltage Vtr set in the trigger level setting circuit 3 is compared with the sampled voltage data. . Then, this sampling signal comparison circuit 4
Then, when the sampling voltage value exceeds the trigger voltage value,
The gate to the next circuit is opened for a fixed time T, and a sampling voltage value V (t) is output. This sampling voltage value V
When (t) is input to the A / D conversion circuit 5, this A / D
The conversion circuit 5 converts an analog voltage value equal to or less than the maximum value Vmax into a digital value, and stores the data in the memory circuit 6. In this case, data is stored in the memory circuit 6 for T seconds after the trigger is detected.

Here, the pulse data to be transmitted during the short time ΔT (Ttrans >> ΔT) between the time Ttrans for transmitting and reproducing the data stored in the memory circuit 6 by the continuous pulse memory circuit 13 is recognized. And n times (n
Is an arbitrary integer) is stored in the continuous pulse memory circuit 13, and the data stored in the continuous pulse memory circuit 13 is sequentially sent to the memory circuit 6 by the timing control of the continuous pulse transmission control circuit 14.

When the data stored in the memory circuit 6 is taken into the digital transmission circuit 7, the digital transmission circuit 7 adds an error detection bit to the data, performs transmission path coding, and then determines the data. The data is transmitted to the transmission line 8 according to the procedure.

On the other hand, the digital receiving circuit 9
The signal is received according to a predetermined procedure, and after decoding and error detection are performed, the signal is input to the D / A conversion circuit 10. This D
The A / A conversion circuit 10 performs analog conversion with a period Δt in the order of time series in the data length when data is digitized on the transmission side, and converts the analog signal into a waveform smoothing filter 11.
To enter.

In the waveform smoothing filter 11, D / A
It compensates for the discontinuity of the reproduced waveform of the analog signal obtained by the conversion circuit 10, converts it into a continuous waveform, and inputs it to the signal output circuit 12. The signal output circuit 12 outputs the output signal from the waveform smoothing filter 11 through a buffer amplifier with impedance matching with an output destination device.

According to the radiation pulse transmission device having such a configuration, it is possible to eliminate the effects of waveform attenuation, distortion, and noise, and to achieve efficient radiation pulse transmission that can minimize the number of pulse counts. Things.

FIG. 5 is a block diagram showing a third embodiment of the radiation pulse transmitting apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. State.

In the third embodiment, as shown in FIG. 5, the data stored in the memory circuit 6 between the memory circuit 6 on the transmission side and the digital transmission circuit 7 is, for example, a case where the waveform adaptation function is a Gaussian function. , The first data, the maximum value, and the last data are converted into the form of (time, voltage) coordinates with the time coordinate of the first data being 0, and the extracted data is output to the digital transmission circuit 7. 1
5; a waveform function calculating circuit 16 for fitting data determined to be normal by the digital receiving circuit 9 to a waveform matching function between the digital receiving circuit 9 on the receiving side and the waveform smoothing filter 11; Function operation circuit 1
And a F / A conversion circuit 17 for obtaining an analog voltage value by substituting a time required for waveform reproduction into a time variable t of the waveform function obtained in step 6 and applying the analog voltage value to the waveform smoothing filter 11. The configuration is the same as in FIG.

Next, the operation of the radiation pulse transmitting apparatus configured as described above will be described with reference to the waveform diagram shown in FIG.

When a radiation voltage pulse is generated from a radiation detector (not shown), a radiation voltage pulse signal having a maximum peak value Vmax is efficiently input to the signal input circuit 1,
The voltage pulse signal is sampled by the signal sampling circuit 2 at a period Δt at which a sample sufficient to reproduce the target voltage pulse signal is obtained.

The data sampled by the signal sampling circuit 2 is input to a sampling signal comparison circuit 4, where the trigger voltage Vtr set in the trigger level setting circuit 3 is compared with the sampled voltage data. . Then, this sampling signal comparison circuit 4
Then, when the sampling voltage value exceeds the trigger voltage value,
The gate to the next circuit is opened for a fixed time T, and a sampling voltage value V (t) is output. This sampling voltage value V
When (t) is input to the A / D conversion circuit 5, the A / D
The conversion circuit 5 converts an analog voltage value equal to or less than the maximum value Vmax into a digital value, and stores the data in the memory circuit 6. In this case, data is stored in the memory circuit 6 for T seconds after the trigger is detected, and the data is taken into the transmission data extraction circuit 15.

In the transmission data extraction circuit 15, if the waveform matching function is a Gaussian function, for example, the data stored in the memory circuit 6 is divided into three data of the first data, the maximum value, and the last data. The coordinates are converted to the form of (time, voltage) coordinates with 0 as the coordinates, which are input to the digital transmission circuit 7.

The digital transmission circuit 7 adds an error detection bit to the data, performs transmission path coding, and then transmits the data to the transmission path 8 according to a predetermined procedure.

On the other hand, the digital receiving circuit 9
The signal is received in accordance with a predetermined procedure, and after decoding and error detection, the signal is input to the waveform function operation circuit 16. The waveform function calculating circuit 16 inputs the data determined to be normal by the digital receiving circuit 9 to the F / A conversion circuit 17 as a waveform function adapted to a waveform adapting function such as a Gaussian function, for example, by a method such as the least square method. I do.

In the F / A conversion circuit 17, the waveform function (for example, Gaussian function) obtained by the waveform function calculation circuit 16 is used.
By substituting the time from the initial value required for waveform reproduction at intervals of Δt to the time change t, an analog voltage value for each Δt is obtained, and the analog signal is input to the waveform smoothing filter 11.

In this waveform smoothing filter 11, F / A
It compensates for the discontinuity of the reproduced waveform of the analog signal obtained by the conversion circuit 17, converts it into a continuous waveform, and inputs it to the signal output circuit 12. The signal output circuit 12 outputs the output signal from the waveform smoothing filter 11 through a buffer amplifier with impedance matching with an output destination device.

According to the radiation pulse transmitting apparatus having such a configuration, it is possible to eliminate the effects of waveform attenuation, distortion, and noise, and to enable efficient radiation pulse transmission.

FIG. 7 is a block diagram showing a fourth embodiment of the radiation pulse transmitting apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. State.

In the fourth embodiment, as shown in FIG. 7, a maximum value extracting circuit for extracting the maximum value from the data stored in the memory circuit 6 between the memory circuit 6 on the transmitting side and the digital transmitting circuit 7 And between the digital receiving circuit 9 on the receiving side and the waveform smoothing filter 11, waveform digital information to be reproduced from the data determined to be normal by the digital receiving circuit 9 is selected, and the selected information is A waveform data output control circuit 20 to be output and a digital waveform data sequence corresponding to the command pattern of the waveform data output control circuit 20 are stored, and the digital data sequence is output in accordance with a command according to a predetermined procedure, and a waveform to be D / A-converted. A data memory and a D / A conversion circuit 19 are provided, and other configurations are the same as those in FIG.

Next, the operation of the radiation pulse transmission device configured as described above will be described.

When a radiation voltage pulse is generated from a radiation detector (not shown), a radiation voltage pulse signal having the maximum peak value Vmax is efficiently input to the signal input circuit 1.
The voltage pulse signal is sampled by the signal sampling circuit 2 at a period Δt at which a sample sufficient to reproduce the target voltage pulse signal is obtained.

The data voltage-sampled by the signal sampling circuit 2 is input to a sampling signal comparison circuit 4, where the trigger voltage Vtr set in the trigger level setting circuit 3 is compared with the sampled voltage data. . Then, this sampling signal comparison circuit 4
Then, when the sampling voltage value exceeds the trigger voltage value,
The gate to the next circuit is opened for a fixed time T, and a sampling voltage value V (t) is output. This sampling voltage value V
When (t) is input to the A / D conversion circuit 5, the A / D
The conversion circuit 5 converts an analog voltage value equal to or less than the maximum value Vmax into a digital value, and stores the data in the memory circuit 6. In this case, data is stored in the memory circuit 6 for T seconds after the trigger is detected, and the data is stored in the maximum value extracting circuit 1.
It is taken into 8.

The maximum value extracting circuit 18 extracts a maximum value from the data stored in the memory circuit 6 and inputs the maximum value to the digital transmitting circuit 7.

The digital transmission circuit 7 adds an error detection bit to the data, performs transmission path coding, and then transmits the data to the transmission path 8 according to a predetermined procedure.

On the other hand, the digital receiving circuit 9
The signal is received according to a predetermined procedure, and after decoding and error detection are performed, the signal is input to the waveform data output control circuit 20. The waveform data output control circuit 20 selects waveform digital information to be reproduced from the data determined to be normal by the digital reception circuit 9 and outputs the selected information as a command to the waveform data memory and the D / A conversion circuit 19. .

When a command is input from the waveform data output control circuit 20 to the waveform data memory and D / A conversion circuit 19,
A digital data sequence is output from the digital waveform data sequence stored in the waveform data memory 19 in accordance with a procedure determined according to a command pattern of the waveform data output control circuit 20, and this is D / A converted and the analog signal is converted. Input to the waveform smoothing filter 11.

In the waveform smoothing filter 11, the discontinuity of the reproduced waveform of the analog signal obtained from the waveform data memory and the D / A conversion circuit 19 is compensated, converted into a continuous waveform, and input to the signal output circuit 12. . This signal output circuit 12
Then, the output signal from the waveform smoothing filter 11 is output through a buffer amplifier after impedance matching with the output destination device.

According to the radiation pulse transmission device having such a configuration, it is possible to eliminate the effects of waveform attenuation, distortion, and noise, and to enable efficient radiation pulse transmission.

FIG. 8 is a block diagram showing a fifth embodiment of the radiation pulse transmitting apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. State.

In the fifth embodiment, as shown in FIG. 8, between the A / D conversion circuit 5 and the memory circuit 6, j pieces of data sampled for waveform determination are arranged in time series (specific to the system). The auxiliary memory 21 for waveform determination temporarily stored by the FIFO method and a waveform determination circuit 22 for determining the time-series change of the data in the auxiliary memory 21 for waveform determination and determining whether to send data to the next stage. The other configuration is the same as that of FIG.

Next, the operation of the radiation pulse transmission device configured as described above will be described with reference to the waveform diagram shown in FIG.

When a radiation voltage pulse is generated from a radiation detector (not shown), a radiation voltage pulse signal having the maximum peak value Vmax is efficiently input to the signal input circuit 1.
The voltage pulse signal is sampled by the signal sampling circuit 2 at a period Δt at which a sample sufficient to reproduce the target voltage pulse signal is obtained.

The data voltage sampled by the signal sampling circuit 2 is input to a sampling signal comparison circuit 4, where the trigger voltage Vtr set in the trigger level setting circuit 3 is compared with the sampled voltage data. . Then, this sampling signal comparison circuit 4
Then, when the sampling voltage value exceeds the trigger voltage value,
The gate to the next circuit is opened for a fixed time T, and a sampling voltage value V (t) is output. This sampling voltage value V
When (t) is input to the A / D conversion circuit 5, this A / D
The conversion circuit 5 converts an analog voltage value equal to or smaller than the maximum value Vmax into a digital value, and inputs the data to the auxiliary memory 21 for waveform determination.

The auxiliary memory 21 for waveform determination temporarily stores j data (j is a natural number unique to the system) of the data sampled for waveform determination in a time-sequential FIFO manner, and stores the data in the waveform determination circuit 22. Capture and time-series changes in data, for example, "determine whether the next data exceeding the trigger level is below the trigger level", "expected data changes after an input exceeding the trigger level" Is different from the waveform to be processed → For example, data suddenly drops where the rate of change should be positive ”and the like, and whether or not to send data to the next stage is determined. The determined data is stored in the memory circuit 6 for T seconds after the trigger detection. Just save.

When the data stored in the memory circuit 6 is taken into the digital transmission circuit 7, the digital transmission circuit 7 adds an error detection bit to the data, performs transmission path coding, and then determines the data. The data is transmitted to the transmission line 8 according to the procedure.

On the other hand, the digital receiving circuit 9
The signal is received according to a predetermined procedure, and after decoding and error detection are performed, the signal is input to the D / A conversion circuit 10. This D
The A / A conversion circuit 10 performs analog conversion with a period Δt in the order of time series in the data length when data is digitized on the transmission side, and converts the analog signal into a waveform smoothing filter 11.
To enter.

In this waveform smoothing filter 11, D / A
It compensates for the discontinuity of the reproduced waveform of the analog signal obtained by the conversion circuit 10, converts it into a continuous waveform, and inputs it to the signal output circuit 12. The signal output circuit 12 outputs the output signal from the waveform smoothing filter 11 through a buffer amplifier with impedance matching with an output destination device.

According to the radiation pulse transmission apparatus having such a configuration, it is possible to perform efficient radiation pulse transmission eliminating the effects of waveform attenuation, distortion, and noise.

FIG. 10 is a block diagram showing a sixth embodiment of the radiation pulse transmitting apparatus according to the present invention. In FIG. 10, the same parts as those of FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. State.

In the sixth embodiment, between the sampling circuit 2 and the memory circuit 6, the voltage V (t) sampled by the sampling circuit 2 and the trigger level setting circuit 3
Is compared with the trigger voltage Vtr, and when the sampling voltage V (t) exceeds the trigger voltage Vtr, the gate to the memory circuit 6 is opened only for Ta after the sampling voltage value falls below the trigger level. In other cases, the sampling signal comparison circuit 4a which opens the gate of the temporary storage auxiliary memory 23 capable of storing data between Tb and outputs the voltage value (Vt) by the FIFO method. The output analog voltage value equal to or less than the maximum value Vmax is converted into a digital signal, and the gate to the memory circuit 6 or the temporary storage memory 23 is opened and closed according to a command from the sampling signal comparison circuit 4a. Is stored in the memory circuit 6, the A / D conversion circuit 5 that issues a data transfer command to the temporary storage auxiliary memory 23 Intended to be provided with a bets, other configuration is similar to that shown in FIG.

Next, the operation of the radiation pulse transmission device configured as described above will be described with reference to FIG.

When a radiation voltage pulse is generated from a radiation detector (not shown), a radiation voltage pulse signal having the maximum peak value Vmax is efficiently input to the signal input circuit 1.
The voltage pulse signal is sampled by the signal sampling circuit 2 at a period Δt at which a sample sufficient to reproduce the target voltage pulse signal is obtained.

The data sampled by the signal sampling circuit 2 is input to a sampling signal comparison circuit 4a, where the trigger voltage Vtr set in the trigger level setting circuit 3 is compared with the sampled voltage data. Then, this sampling signal comparison circuit 4a
Then, when the sampling voltage value exceeds the trigger voltage value, the gate to the memory circuit 6 is opened only for Ta after the sampling voltage value becomes equal to or less than the trigger level. The gate of the temporary storage auxiliary memory 23 capable of storing data is opened, and the voltage value V
(T) is output.

Therefore, the analog voltage value less than the maximum value Vmax output from the sampling signal comparison circuit 4a is A
The digital signal is converted by the / D conversion circuit 5a, and the gate to the memory circuit 6 or the temporary storage auxiliary memory 23 is opened and closed according to a command from the sampling signal comparison circuit 4a. In this case, the A / D conversion circuit 5a issues a data transfer command to the temporary storage auxiliary memory 23.

In the temporary storage auxiliary memory 23, data at the trigger level or lower is sequentially stored in a time series from the sampling signal comparison circuit 4a for the time Tb by the FIFO method.
When receiving a command from the A / D conversion circuit 5a, the data is transferred to the memory circuit 6.

When the data from the A / D conversion circuit 5a and the temporary storage auxiliary memory 23 stored in the memory circuit 6 are taken into the digital transmission circuit 7, the digital transmission circuit 7 adds an error detection bit to the data. After the addition and transmission path coding, the data is transmitted to the transmission path 8 according to a predetermined procedure.

On the other hand, the digital receiving circuit 9
The signal is received according to a predetermined procedure, and after decoding and error detection are performed, the signal is input to the D / A conversion circuit 10. This D
The A / A conversion circuit 10 performs analog conversion with a period Δt in the order of time series in the data length when data is digitized on the transmission side, and converts the analog signal into a waveform smoothing filter 11.
To enter.

In this waveform smoothing filter 11, D / A
It compensates for the discontinuity of the reproduced waveform of the analog signal obtained by the conversion circuit 10, converts it into a continuous waveform, and inputs it to the signal output circuit 12. The signal output circuit 12 outputs the output signal from the waveform smoothing filter 11 through a buffer amplifier with impedance matching with an output destination device.

According to the radiation pulse transmitting apparatus having such a configuration, it is possible to perform efficient radiation pulse transmission in which the effects of waveform attenuation, distortion, and noise are eliminated.

[0079]

As described above, according to the present invention, radiation which can suppress attenuation, distortion, and superposition of noise on a transmission line of a radiation pulse waveform, and which can efficiently digitally transmit only a target signal. A pulse transmission device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a radiation pulse transmission device according to the present invention.

FIG. 2 is a waveform chart for explaining the operation of the embodiment.

FIG. 3 is a block diagram illustrating a radiation pulse transmission device according to a second embodiment of the present invention.

FIG. 4 is a waveform chart for explaining the operation of the embodiment.

FIG. 5 is a block diagram illustrating a radiation pulse transmission device according to a third embodiment of the present invention.

FIG. 6 is a waveform chart for explaining the operation of the embodiment.

FIG. 7 is a block diagram illustrating a radiation pulse transmission device according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram showing a fifth embodiment of the radiation pulse transmission device according to the present invention.

FIG. 9 is a waveform chart for explaining the operation of the embodiment.

FIG. 10 is a block diagram showing a sixth embodiment of the radiation pulse transmitting apparatus according to the present invention.

FIG. 11 is a waveform chart for explaining the operation of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Signal input circuit 2 ... Signal sampling circuit 3 ... Trigger level setting circuit 4 ... Sampling signal comparison circuit 5 ... A / D conversion circuit 6 ... Memory circuit 7 ... Digital transmission circuit 8 ... Digital transmission Path 9 Digital receiving circuit 10 D / A conversion circuit 11 Waveform smoothing filter 12 Signal output circuit 13 Continuous pulse memory circuit 14 Continuous pulse transmission control circuit 15 Transmission data extraction circuit 16 waveform function calculation circuit 17 F / A conversion circuit 18 maximum value extraction circuit 19 A / D conversion circuit with waveform data memory 20 waveform data output control circuit 21 waveform determination memory 22 …… Waveform judgment circuit 23 …… Auxiliary memory for temporary storage

Claims (6)

[Claims] 1. A radiation pulse transmission device which digitizes a pulse waveform input from a radiation detector, transmits the digitized waveform to a measurement system, and converts the received digital signal into an analog signal to reproduce the waveform. Sampling means for sampling the signal level of the pulse waveform at a predetermined cycle; setting means for setting a reference value as to whether or not to transmit the signal sampled by the sampling means as waveform reproduction data; and Comparing means for comparing a signal with a reference value set by the setting means and outputting a sampling signal exceeding the reference value for a certain period of time; and digital converting means for digitally converting the sampling signal output from the comparing means. The digital signal converted by the digital conversion means is used for waveform reproduction. Storage means for storing a constant time, the radiation pulse transmission apparatus characterized by comprising a transmitting means for transmitting the information stored in the storage unit to the measuring system collectively. 2. A radiation pulse transmitting apparatus according to claim 1, wherein said digital conversion means converts a pulse signal inputted to said sampling means into a digital signal by a digital conversion means for a continuous pulse having a length exceeding a predetermined transmission time. A radiation pulse transmission apparatus, comprising: a multi-stage storage means for storing the stored data in a time-series manner; and a transfer control means for sequentially controlling transfer of the data stored in the multi-stage storage means to the storage means. 3. The radiation pulse transmitting apparatus according to claim 1, wherein a necessary number of data for waveform reproduction is extracted from the digital data stored in said storage means and output to said digital transmission means. A data extracting means, and a waveform function calculating means for deriving a radiation pulse waveform from the digital data received by the receiving means and the radiation pulse fitting function and outputting a digital data sequence for waveform reproduction is provided in the measurement system. A radiation pulse transmission device characterized by the above-mentioned. 4. The radiation pulse transmitting apparatus according to claim 1, further comprising a maximum value extracting unit that extracts a maximum value from digital data serving as a target waveform stored in the storage unit and transmits the maximum value to the transmission unit. A radiation system comprising: a measurement system provided with a waveform data output control means for selecting a digital data sequence for reproducing the target waveform from the maximum value digital data received by the reception means and outputting the selected information. Pulse transmission device. 5. The radiation pulse transmitting apparatus according to claim 2, wherein it is determined whether or not there is a time-series change in data stored in the multi-stage storage means in a time-series order. A radiation judging means for transferring data to the means. 6. The radiation pulse transmitting apparatus according to claim 1, wherein when the comparing means determines that the sampling signal has exceeded a reference value, the reference value set in the setting means by a command from the comparing means. Auxiliary storage means is provided for digitizing the signal sequentially sampled by the digital conversion means and storing the signal for a certain period of time, and when there is an input where the sampling signal exceeds a reference value set in the setting means, A radiation pulse, wherein data before input exceeding a reference value stored in the auxiliary storage means is transferred to the storage means in response to a command from the comparison means, and the data is also transmitted collectively. Transmission equipment.