JP2576231B2 - Landry Monitor - Google Patents
Landry MonitorInfo
- Publication number
- JP2576231B2 JP2576231B2 JP1162240A JP16224089A JP2576231B2 JP 2576231 B2 JP2576231 B2 JP 2576231B2 JP 1162240 A JP1162240 A JP 1162240A JP 16224089 A JP16224089 A JP 16224089A JP 2576231 B2 JP2576231 B2 JP 2576231B2
- Authority
- JP
- Japan
- Prior art keywords
- photoelectric switch
- gate
- signal
- pulse length
- wire mesh
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Radiation (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は、原子力発電所等の放射性物質取扱い施設に
おいて、使用済みの衣服等の被測定物を洗濯する前また
は後に、その表面の放射能汚染検査を行うランドリモニ
タに関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a radioactive material handling facility such as a nuclear power plant, which is used to wash radioactive materials on the surface of a measured object such as used clothes before or after washing. The present invention relates to a land re-monitor that performs a contamination test.
(従来の技術) 第2図は従来のランドリモニタの概略構成図を示す。
図においてランドリモニタ1は、主として被測定搬送用
金網コンベア2、このコンベア2に対向して設けられた
他の搬送用金網コンベア3、発光素子4Aと受光素子4Bと
からなる光電スイッチ4、放射線検出器5,5A、計測器6,
6Aおよび信号処理部(マイクロコンピュータ)7から構
成され、ランドリモニタ本体1A内に収容される。光電ス
イッチ4の発光素子4Aおよび受光素子4Bは、モニタ本体
1A内の搬送用金網コンベア2の上下に配置され、搬入さ
れる被測定物を検知する。(Prior Art) FIG. 2 is a schematic configuration diagram of a conventional land re-monitor.
In the figure, a land re-monitor 1 mainly includes a wire mesh conveyor 2 to be measured, another wire mesh conveyor 3 provided opposite to the conveyor 2, a photoelectric switch 4 including a light emitting element 4A and a light receiving element 4B, radiation detection. Instrument 5,5A, measuring instrument 6,
6A and a signal processing unit (microcomputer) 7 are housed in the land re-monitor body 1A. The light emitting element 4A and the light receiving element 4B of the photoelectric switch 4 are a monitor main body.
It is placed above and below the wire mesh conveyor 2 in 1A, and detects an object to be carried in.
(発明が解決しようとする課題) ところが、光電スイッチ4は、各素子4A,4Bが劣化ま
たはそのレンズ面に埃が付着するために、感度が低下す
るという問題があった。一般的に、光電スイッチ4の感
度は、被測定物が確実に検知できる条件、すなわち被測
定物の厚さ、材質等により異なる。例えば薄いものまた
は透明度が高いものほど、光電スイッチ4の光束(ビー
ム)の透過度が良くなるために、光電スイッチ4の感度
を低くしないと、被測定物を検知することができない。
従って、光電スイッチ4の感度は、被測定物を検知する
が、金網コンベア2の金属素線を検知しない範囲の中間
程度の感度に設定されることが必要であった。(Problems to be Solved by the Invention) However, the photoelectric switch 4 has a problem that the sensitivity is lowered because the elements 4A and 4B are deteriorated or dust adheres to the lens surfaces thereof. In general, the sensitivity of the photoelectric switch 4 varies depending on the conditions under which the object to be measured can be reliably detected, that is, the thickness and material of the object to be measured. For example, the thinner or the higher the transparency, the better the transmittance of the light beam (beam) of the photoelectric switch 4. Therefore, the object to be measured cannot be detected unless the sensitivity of the photoelectric switch 4 is reduced.
Therefore, the sensitivity of the photoelectric switch 4 needs to be set to an intermediate level between the range in which the object to be measured is detected but the metal wire of the wire mesh conveyor 2 is not detected.
また、光電スイッチ4は、受光素子4Bの受光量によつ
て検知回路がオン・オフするから、発光素子4Aおよび受
光素子4Bのレンズ面に埃が堆積したり、光軸がすれてい
ると、受光量が減少して感度が低下したと同様の状態と
なり、透過度が被測定物より遥かによい金網コンベア2
の金属素線を検知する恐れがあった。従って、この光電
スイッチ4の被測定物検知信号は、ランドリモニタ1の
測定動作において、各種のタイミングをとるためのトリ
ガーとして使用されるから、この金網コンベア2の金属
素線を検知することによって、ランドリモニタ1に誤動
作を与えるという解決すべき重要な課題があった。Further, since the detection circuit of the photoelectric switch 4 is turned on / off according to the amount of light received by the light receiving element 4B, if dust accumulates on the lens surfaces of the light emitting element 4A and the light receiving element 4B or the optical axis is shifted, The same condition as when the amount of received light is reduced and the sensitivity is reduced, and the wire mesh conveyor 2 whose transmittance is much better than that of the object to be measured.
There was a risk of detecting the metal element wire. Therefore, the object detection signal of the photoelectric switch 4 is used as a trigger for setting various timings in the measurement operation of the land re-monitor 1, and by detecting the metal element wire of the wire mesh conveyor 2, There is an important problem to be solved in that the land re-monitor 1 may malfunction.
本発明は、上述の点に鑑み、従来技術の問題点を有効
に解決し、被測定物を検知する光電スイッチの感度低下
による誤動作が検知され、その信頼性が向上するランド
リモニタを提供することを目的とする。The present invention has been made in consideration of the above circumstances, and provides a land re-monitor that effectively solves the problems of the related art, detects a malfunction due to a decrease in sensitivity of a photoelectric switch that detects an object to be measured, and improves the reliability thereof. With the goal.
(課題を解決するための手段) このような目的を達成するために、本発明は、金網コ
ンベアに対向して設けられ前記金網コンベアにより搬入
される被測定物の放射能汚染を測定する放射線検出器
と、所要の感度範囲内で前記被測定物の搬入を検知する
光電スイッチとを有するランドリモニタにおいて、前記
光電スイッチの出力信号が入力されるゲート回路と、前
記被測定物による出力信号のパルス長さより短い前記金
網コンベアの素線によるパルス長さに制御したゲート信
号を前記ゲート回路に出力するゲート制御回路とからな
り、前記光電スイッチの感度が低下して前記出力信号の
パルス長が前記金網コンベアの素線検知に対応する前記
ゲート信号のパルス長以下で警報信号を出力する光電ス
イッチ感度検知回路を備えることを特徴とする。(Means for Solving the Problems) In order to achieve such an object, the present invention provides a radiation detection apparatus which is provided to face a wire mesh conveyor and measures radioactive contamination of an object to be measured carried in by the wire mesh conveyor. And a gate circuit to which an output signal of the photoelectric switch is input, and a pulse of an output signal by the object to be measured. A gate control circuit that outputs a gate signal controlled to a pulse length by the element wire of the wire mesh conveyor shorter than the length to the gate circuit, the sensitivity of the photoelectric switch is reduced, and the pulse length of the output signal is reduced by the wire mesh. It is provided with a photoelectric switch sensitivity detection circuit that outputs an alarm signal at a pulse length of the gate signal or less corresponding to the detection of a strand of a conveyor. .
(作用) このような技術手段により、本発明は、光電スイッチ
の出力信号が入力されるゲート回路および前記被測定物
による出力信号のパルス長さより短い金網コンベアの素
線によるパルス長さに制御したゲート信号を前記ゲート
回路に出力するゲート制御回路からなる光電スイッチ感
度検知回路によって、光電スイッチの感度が低下して出
力信号のパルス長が金網コンベアの金属素線検知に対応
する前記ゲート信号のパルス長以下になると警報信号を
出力することによって、ランドリモニタの誤動作が防止
され、その信頼性が向上する。(Operation) By such technical means, in the present invention, the pulse length is controlled by the wire circuit of the wire mesh conveyor, which is shorter than the pulse length of the output signal by the gate circuit to which the output signal of the photoelectric switch is input and the output signal by the device under test. A photoelectric switch sensitivity detection circuit comprising a gate control circuit that outputs a gate signal to the gate circuit reduces the sensitivity of the photoelectric switch, and the pulse length of the output signal corresponds to the metal wire detection of the wire mesh conveyor. By outputting an alarm signal when the length becomes shorter than the length, a malfunction of the land re-monitor is prevented, and the reliability thereof is improved.
(実施例) 次に、本発明の実施例を図面に基づき、詳細に説明す
る。(Example) Next, an example of the present invention will be described in detail with reference to the drawings.
第1図は本発明の一実施例の概略構成図を示し、
(A)はそのブロック図、(B)は(A)のゲート信号
の波形図である。図において光電スイッチ感度検知回路
8は、主としてゲート制御回路9およびゲート回路10か
ら構成される。光電スイッチ4の出力信号aは、ゲート
制御回路9およびゲート回路10に入力され、ゲート制御
回路9にて制御されたゲート信号bがゲート回路10に入
力される。出力信号aのパルス長さがゲート信号bのパ
ルス長さp以下の場合には、ゲート回路10から警報信号
cを出力する。反対に、パルス長さp以上の場合には、
被測定物検知信号dを出力する。FIG. 1 shows a schematic configuration diagram of one embodiment of the present invention,
(A) is a block diagram thereof, and (B) is a waveform diagram of the gate signal of (A). In the figure, a photoelectric switch sensitivity detection circuit 8 mainly includes a gate control circuit 9 and a gate circuit 10. The output signal a of the photoelectric switch 4 is input to the gate control circuit 9 and the gate circuit 10, and the gate signal b controlled by the gate control circuit 9 is input to the gate circuit 10. If the pulse length of the output signal a is less than or equal to the pulse length p of the gate signal b, the gate circuit 10 outputs an alarm signal c. Conversely, if the pulse length is longer than p,
An object-under-test detection signal d is output.
通常、被測定物の長さは最低でも100mm程度を有し、
金網コンベア2の金属素線の径は2mm以下であるから、
光電スイッチ4の被測定物検知信号aのパルス長さは、
金属素線を検知した場合のパルス長さと大幅に異なる。
従って、検知信号aのパルス長さ(パルス時間)に注目
することにより、被測定物と金網コンベア2との判別が
可能となる。このために、ゲート制御回路9のゲート信
号bは、金網コンベア2の速度よび金属素線の径によっ
てそのパルス長さpが選定される。例えば、このパルス
長さpを0.5秒と仮定すれば、光電スイッチ4の感度低
下が確実に検知され、かつその誤動作が防止される。Usually, the length of the object to be measured has at least about 100 mm,
Since the diameter of the metal wire of the wire mesh conveyor 2 is 2 mm or less,
The pulse length of the DUT detection signal a of the photoelectric switch 4 is
Significantly different from the pulse length when a metal strand is detected.
Therefore, by paying attention to the pulse length (pulse time) of the detection signal “a”, it is possible to determine the object to be measured and the wire mesh conveyor 2. For this purpose, the pulse length p of the gate signal b of the gate control circuit 9 is selected according to the speed of the wire mesh conveyor 2 and the diameter of the metal element wire. For example, assuming that the pulse length p is 0.5 seconds, a decrease in the sensitivity of the photoelectric switch 4 is reliably detected, and its malfunction is prevented.
(発明の効果) 以上に説明するように、本発明によれば、光電スイッ
チの出力信号が入力されるゲート回路と、前記被測定物
による出力信号のパルス長さより短い金網コンベアの金
属素線によるパルス長さに制御したゲート信号を前記ゲ
ート回路に出力するゲート制御回路とからなる光電スイ
ッチ感度検知回路を設けることにより、前記光電スイッ
チの感度が低下して前記出力信号のパルス長が前記金網
コンベアの金属素線検知に対応する前記ゲート信号のパ
ルス長以下で警報信号を出力するから、従来技術の問題
点が有効に解決され、光電スイッチの感度低下が容易に
検知され、その誤動作が防止され、その信頼性が向上す
る等の効果を奏する。(Effect of the Invention) As described above, according to the present invention, the gate circuit to which the output signal of the photoelectric switch is input and the metal wire of the wire mesh conveyor shorter than the pulse length of the output signal from the device under test are provided. By providing a photoelectric switch sensitivity detection circuit including a gate control circuit that outputs a gate signal controlled to a pulse length to the gate circuit, the sensitivity of the photoelectric switch is reduced and the pulse length of the output signal is reduced by the wire mesh conveyor. Since an alarm signal is output at a pulse length equal to or less than the gate signal corresponding to the detection of the metal element wire, the problems of the related art are effectively solved, a decrease in the sensitivity of the photoelectric switch is easily detected, and the malfunction thereof is prevented. This has the effect of improving the reliability.
第1図は本発明の一実施例の概略構成図を示し、同図
(A)はそのブロック図、同図(B)は同図(A)のゲ
ート信号の波形図、第2図は従来のランドリモニタの概
略構成図である。 4……光電スイッチ、 8……光電スイッチ感度検知回路、 9……ゲート制御回路、 10……ゲート回路、 a……出力信号、 b……ゲート信号、 c……警報信号、 d……被測定物検知信号。FIG. 1 is a schematic configuration diagram of one embodiment of the present invention, FIG. 1A is a block diagram thereof, FIG. 1B is a waveform diagram of the gate signal of FIG. 1A, and FIG. FIG. 3 is a schematic configuration diagram of a land re-monitor. 4 ... photoelectric switch, 8 ... photoelectric switch sensitivity detection circuit, 9 ... gate control circuit, 10 ... gate circuit, a ... output signal, b ... gate signal, c ... alarm signal, d ... Object detection signal.
Claims (1)
コンベアにより搬入される被測定物の放射能汚染を測定
する放射線検出器と、所要の感度範囲内で前記被測定物
の搬入を検知する光電スイッチとを有するランドリモニ
タにおいて、前記光電スイッチの出力信号が入力される
ゲート回路と、前記被測定物による出力信号のパルス長
さより短い前記金網コンベアの素線によるパルス長さに
制御したゲート信号を前記ゲート回路に出力するゲート
制御回路とからなり、前記光電スイッチの感度が低下し
て前記出力信号のパルス長が前記金網コンベアの素線検
知に対応する前記ゲート信号のパルス長以下で警報信号
を出力する光電スイッチ感度検知回路を備えたことを特
徴とするランドリモニタ。1. A radiation detector provided opposite to a wire mesh conveyor for measuring radioactive contamination of an object transported by the wire mesh conveyor, and detecting the transport of the object to be measured within a required sensitivity range. In a land re-monitor having a photoelectric switch, a gate circuit to which an output signal of the photoelectric switch is input, and a gate signal controlled to a pulse length by a wire of the wire mesh conveyor shorter than a pulse length of an output signal by the device under test. A gate control circuit that outputs a signal to the gate circuit, wherein the sensitivity of the photoelectric switch is reduced and the pulse length of the output signal is less than or equal to the pulse length of the gate signal corresponding to the wire detection of the wire mesh conveyor. A land re-monitor comprising a photoelectric switch sensitivity detection circuit that outputs a signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1162240A JP2576231B2 (en) | 1989-06-23 | 1989-06-23 | Landry Monitor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1162240A JP2576231B2 (en) | 1989-06-23 | 1989-06-23 | Landry Monitor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0326985A JPH0326985A (en) | 1991-02-05 |
JP2576231B2 true JP2576231B2 (en) | 1997-01-29 |
Family
ID=15750650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1162240A Expired - Fee Related JP2576231B2 (en) | 1989-06-23 | 1989-06-23 | Landry Monitor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2576231B2 (en) |
-
1989
- 1989-06-23 JP JP1162240A patent/JP2576231B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH0326985A (en) | 1991-02-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |