JPH08195714A - Optical alarm input device - Google Patents

Abstract

PURPOSE: To obtain an economical monitor system by making a mirror act so as to set an optical axis vertically on the notification of an alarm, and reflect light to be returned to an optical fiber, and detecting the reflected light as an alarm input on the monitor side. CONSTITUTION: A light emitting diode 2 of a monitor 1 emits a reference light 4 to an optical fiber 5 via a half mirror 3. Then a reflected light 8 is returned to the optical fiber 5 from a monitored device 6 which faces a mirror 7 to a vertical plane with respect to the optical axis when any of monitored items is faulty. The monitor 1 uses a half mirror 3 to separate the reflected light 8, which is led to a photo transistor 9, where photoelectric conversion is conducted and an electric alarm signal is obtained from a terminal 10. That is, when any of the monitored items is faulty, a fuse 11 corresponding to the faulty item is blown out, the mirror 7 is turned by a spring 12 and the mirror 7 and a connector 14 face with each other in the vertical plane with respect to the optical axis direction of the optical connector 14 so as to align the optical axes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm input, and more particularly, to an alarm input of a monitoring device for converting mechanical or physical information of a terminal to optical information after optical transmission to a monitoring side and collecting the alarm.

[0002]

2. Description of the Related Art Conventional alarm input is input by opening and closing electrical contacts such as relays and switches as terminal devices on the monitored side. That is, as shown in FIG. 4, the circuit power supply 102 and the transistor receiving end circuit 1 are provided on the monitoring side.
In addition to 09, a surge arrester 111 and a noise reduction circuit 110 for noise suppression are provided as a surge and noise suppression for the wiring connecting the monitoring side and the monitored side.

On the monitored side, there is a terminal device having a contact 107 of a relay or a switch, and information is input by the operation of the terminal device. The transistor receiving end circuit 109 may be a relay circuit.

In such an electric alarm input circuit, it is necessary to use a protection circuit or a special relay as described above in order to eliminate the influence of noise and lightning which are external influences on wiring from high voltage and high electric field. In addition, a dedicated power supply device is required as an alarm input means from the monitored side. For these reasons, the conventional alarm input device using the electric circuit system is expensive and large in size.

[0005]

In the above-mentioned conventional alarm input device using relays and switches, information is electrically transmitted, so that cable is wired from the monitoring side to the monitored side terminal device, and the monitored side is also connected. A dedicated power supply device was required as an alarm input means from the side. For this reason, in order to avoid the influence of external noise, lightning, etc., the above-mentioned special parts and protection circuit are required, and there is a problem that the equipment cost is large and the size is large.

An object of the present invention is to provide an optical alarm input circuit having an optical fiber and a light reflecting means, etc., and to prevent an external influence such as a high voltage and a high electric field, thereby making it possible to provide an inexpensive and compact optical signal. It is to provide an alarm input method.

[0007]

In order to achieve the above object, an optical alarm input device of the present invention comprises an optical fiber connecting an alarm input end on the monitoring side and an alarm output end on the monitored side, and the monitoring side. A light source device for sending light to the optical fiber, a terminal device having a light reflecting means for reflecting and injecting the light from the light source into the optical fiber at the alarm output end at the time of alarm output, and the alarm input end. In, a light separating device for separating the light from the light source transmitted from the monitoring side to the monitored side and the reflected light transmitted from the monitored side to the monitoring side, and a light detection device for detecting the reflected light It includes and.

The light source device preferably comprises a light emitting diode.

The light separating device may be a half mirror.

The photodetector may be a phototransistor.

Further, in the terminal device, when the mercury of the thermometer rises and reaches the set temperature scale, the scale portion may become a mirror and the reflected light may be incident to return to the optical fiber.

The terminal device may be composed of a magnetic needle and an optical connector, and when the optical connector portion is at a detection position corresponding to the magnetic needle, the reflected light of the magnetic needle may be incident to return to the optical fiber.

Further, the terminal device is composed of a movable monitored body to which a mirror is attached and an optical connector, and when the mirror position is at the detection position corresponding to the optical connector, the reflected light of the mirror is made incident back to the optical fiber. You can also

[0014]

The optical alarm input device configured as described above always sends light to the optical fiber, and the light from the optical fiber remains unchanged on the monitored side, but the optical axis is sent to the optical axis when the alarm is issued. The mirror is actuated vertically so that it reflects light back into the optical fiber. On the monitoring side, the reflected light is detected and used as an alarm input.

The terminal device reflects light and is applied to a mercury thermometer of a mirror, a magnetic needle, a movable monitored object having a mirror attached thereto, or the like to set a temperature, a north direction, or a horizontal direction of the monitored object, respectively. Acts to detect.

[0016]

The present invention will be described below with reference to the drawings. FIG. 1 is an embodiment of the present invention, FIG. 1A is a configuration diagram, and FIG. 1B is an operation explanatory diagram of a failure detection mirror.
In the monitoring device 1, the light emitting diode 2 sends out the reference light 4 to the optical fiber 5 via the half mirror 3. Next, in the monitored device 6, when any of the monitored items is abnormal, the mirror 7
Is incident on the optical fiber 5 so that the reflected light 8 is directed to the optical fiber 5 in a plane perpendicular to the optical axis of the fiber 5. In the monitoring device 1, the reflected light 8 is separated by the half mirror 3 and introduced into the phototransistor 9 to perform photoelectric conversion to obtain an electrical alarm signal from the terminal 10.

The operation of the mirror 7 of this embodiment is shown in FIG. That is, when any of the monitoring items is abnormal, the fuse 11 corresponding to the item is blown and the spring 12 rotates the mirror 7 so that the mirror 7 and the connector 14 face each other in a plane perpendicular to the optical axis direction of the optical connector 14. The optical axes are matched.

FIG. 2 shows an application example of a terminal unit for detecting an abnormality monitoring item. That is, FIG. 2A is an external view of the alarm thermometer, and FIG. 2B is an explanatory view thereof.

When the glass of the thermometer is made of a material having good light transmittance and reflectivity, when the mercury rises and reaches the set temperature scale, that is, the set position of the optical fiber, the glass surface of the thermometer becomes a mirror shape and the optical fiber The rise in temperature is alarmed by reflecting the light emitted from and making it enter the optical fiber so as to return to it.

In the prior art, in order to achieve the above-mentioned object, a bimetal, a temperature resistor (platinum) or the like is used for electrical processing.

FIG. 3 (a) is an explanatory diagram of a north detector using the same principle, and FIG. 3 (b) is an explanatory diagram of a horizontal detector. That is, it is a method of making a magnetic needle into a mirror shape, or attaching a mirror to a movable monitoring target, and obtaining reflected light to give an alarm when at the detection position. The north north detector is provided with a surface treatment for reflecting a magnetic needle like a mirror, and one end of the fiber is provided so as to face this needle portion. If you return it, you can detect Shinhoku.

Similarly to the above, if the object to be monitored is made to reflect light when it reaches a horizontal position, the horizontal position can be detected. Further, it is possible to detect a certain predetermined angle of the monitored object by appropriately adjusting the position of the optical fiber.

[0023]

As described above, according to the present invention, a monitoring item can be input by using an optical fiber for an alarm input device and using an electric circuit having no input circuit and no parts. Therefore, since it is not affected by high voltage and high electric field of power equipment and broadcasting equipment, when it is applied to the monitoring system used for the equipment, it is not necessary to consider the noise and interference of the wiring, and it is possible to avoid Since there is no need for a dedicated power source as the alarm input means, it is possible to construct an economical monitoring system.

[Brief description of drawings]

FIG. 1A is a configuration diagram of an optical alarm input device. (B) It is operation | movement explanatory drawing of the failure detection mirror of an optical alarm input device.

FIG. 2 (a) is an external view of an alarm thermometer. (B) It is a detailed explanatory view of an alarm thermometer.

FIG. 3A is an explanatory diagram of a north north detector. (B) It is explanatory drawing of a horizontal detector.

FIG. 4 is a configuration diagram of an alarm input device according to a conventional technique.

[Explanation of symbols]

 1 Monitoring Device 2 Light Emitting Diode 3 Half Mirror 4 Reference Light 5 Optical Fiber 6 Monitored Device 7 Mirror 8 Reflected Light 9 Phototransistor 10 Terminal 11 Fuse 12 Spring 14 Optical Connector 15 Magnetic Needle 16 Mirror 102 Power Terminal 105 Cable Wiring 107 Relay Contact or Switch contact 109 Transistor receiving circuit 110 Noise countermeasure section 111 Surge countermeasure section 112 Output terminal

Claims (7)

[Claims] 1. An optical fiber connecting an alarm input end on a monitoring side and an alarm output end on a monitored side, a light source device for sending light to the optical fiber on the monitoring side, and the alarm output when outputting an alarm. A terminal device having a light reflecting means for reflecting the light from the light source and returning the light from the light source to the optical fiber at the end; and the light from the light source transmitted from the monitoring side to the monitored side at the alarm input end. An optical alarm input device comprising: a light separating device for separating the reflected light transmitted from the monitored side to the monitoring side; and a light detecting device for detecting the reflected light. 2. The optical alarm input device according to claim 1, wherein the light source device comprises a light emitting diode. 3. The optical alarm input device according to claim 1, wherein the optical separation device is a half mirror. 4. The light alarm input device according to claim 1, wherein the light detection device comprises a phototransistor. 5. The terminal device is a thermometer, and when the mercury rises to reach a set temperature scale, the scale portion becomes a mirror shape and the reflected light is made incident to return to the optical fiber. The optical alarm input device according to claim 1. 6. The terminal device comprises a magnetic needle and an optical connector, and when the optical connector portion is at a detection position corresponding to the magnetic needle, the reflected light from the magnetic needle is made incident so as to return to the optical fiber. The optical alarm input device according to 1. 7. The terminal device comprises a movable monitored body to which a mirror is attached and an optical connector, and when the mirror position is at a detection position corresponding to the optical connector, the reflected light of the mirror is returned to the optical fiber. The optical alarm input device according to claim 1, which is configured to be incident.