JPS60207065A - Optical fiber transmitting type anemoscope - Google Patents

Abstract

PURPOSE:To transmit a high reliability signal to a receiver, by converting the signal from an absolute type rotary encoder as a sensor to an optical signal before transmitting the same to the receiver by one optical fiber. CONSTITUTION:Emitted parallel light from the light emitting element 4 in an anemoscope rotating along with a rotary shaft 2 is incident to a rotary encoder plate 1 and only the light transmitted through the slits 3 thereof is received by a light receiving element 5 while the other parallel light is blocked by the encoder plate 1 to obtain a combination of transmitted parallel light and blocked parallel light. This combination is uniquely determined by the rotary angle of the rotary encoder plate 1, that is, the rotary angle of the anemoscope and, therefore, transmitted to a receiver 9 as a signal to judge a wind direction.

Description

[Detailed description of the invention] This invention converts a wind direction signal from a wind direction signal into an optical signal,
The present invention relates to an optical fiber transmission type wind vane that transmits the optical signal to a receiver through an optical fiber and determines the wind direction at the receiver.

As shown in Figure 1, in a conventional wind vane, when the tail T of the aircraft body model Δ with a rotatable propeller receives the wind, the fuselage F faces directly in the wind direction and is linked to the rotation axis X of the model Δ. The variation in electrical resistance of the potentiometer P coupled in this way is converted into the wind direction. The conversion method is to apply a DC voltage (usually around DCIV) to both ends A and B of the potentiometer P from the receiver to the metallic cable or electric wire M,
A voltage signal from a potentiometer P depending on the wind direction is transmitted to the receiver R by a metallic cable or electric wire M'. If such a wind vane is installed near a power transmission line located in the Yama 1 river, the signal transmission line M' will be affected by power line opening/closing surges, lightning surges, etc., and the reliability of the signal will deteriorate. Not only this, but accidents have also occurred in which the signal transmission line is dropped, resulting in damage not only to the wind vane but also to the receiver and electrical equipment installed around the receiver. Also, the transmitted signal is an electrical signal, so it is 500
Conventional wind vanes have the above-mentioned drawbacks because they use metallic cables or electric wires as signal transmission paths, such as being able to transmit signals only over a distance of about 300 m. Also potentiometer P
There were the following drawbacks due to the use of That is, the wind direction value changes due to aging of the potentiometer P serving as the sensor section.

Power consumption is large. Also, both ends A of the potentiometer P,
Fluctuations in the voltage applied to B become a source of signal error.

This invention employs an abunlute rotary encoder as a sensor, converts the signal from the sensor into a serial signal, and further converts this signal into an optical signal and transmits it to a receiver through a single optical fiber. The object of the present invention is to provide an optical fiber transmission type wind vane which can eliminate the various drawbacks mentioned above in the wind vane.

The gist of the invention lies in the structure of the optical fiber transmission type wind vane described in the claims above.

Hereinafter, the present invention will be explained in detail with reference to the drawings showing embodiments thereof. Fig. 2 is a perspective view showing the wind direction detecting section (wind direction sensor section). To the external model of an aircraft fuselage that rotates due to changes in wind direction (
The rotary encoder plate 1 is a rotating shaft of the rotary encoder plate 1 (see FIG. 1), and is fixedly fixed through the center of the rotary encoder plate 1 at right angles, and the rotary encoder plate 1 is formed to rotate integrally with the rotary shaft 2. The encoder plate 1 has many concentric slits 3-
As shown in the figure, one slit 3 with a length of half a circumference is bored on the innermost concentric circle, and then on the second concentric circle of -1, In L. Two slits 3 having a length of 24 circumferences are alternately bored with parts of the same length without slits 3. In the next three concentric circles - L, 2B = 8
Four circumferential slits 3 are drilled in the same manner as above, alternating with areas without slits, and similarly, on the nth concentric circle, 2+1 slits 3 of U circumference are provided in 2n-1 pieces. It will be done. A light emitting element 4 that passes through the intersection of a certain reference diameter and each concentric circle in the encoder plate 1 formed in this manner and is placed on a line at right angles to the encoder plate 1 with the encoder plate 1 in between, and has a lens and emits parallel light rays. , and light-receiving elements 5, which receive the parallel light beams emitted by the light-emitting elements 4, are arranged to face each other. FIG. 3(a) is a sectional view of the encoder plate 1 at the position where the light emitting elements 4 and the light receiving elements 5 are arranged as explained above. In Figure (b), the - light emitting element 4 is all the light receiving element -5.
A large lens 4'' is attached to the light-emitting element 4 to serve as a light source for the light-emitting element 4 so that parallel light rays reach all the light-receiving elements 5. The light is received by the light-receiving elements 5... It goes without saying that all parallel light rays are only those that pass through the slit 3 in the rotary encoder plate IK.Although the light emitting element 4- and the beam are powered by the direct wire 4' to emit light, the entire circuit Since it is not necessary to emit light continuously due to the nature of reducing power consumption and measuring wind direction, it is not shown in the drawing that it emits light intermittently and cyclically for 10011 seconds per second as shown in Figure 4. A circuit is incorporated in the power supply circuit of the light emitting element, and a solar cell power supply system, which is not shown in the drawings, is used as a power source.Light emitting element 4.

Or, in the case of Fig. 3 (1)), one light emitting element 4 sends parallel light rays to all the attached light receiving elements 5, but these lights are transmitted through the slit 3 or transmitted through the rotary encoder. Since the combination of signals blocked by the plate 1 is obtained as a parallel electric signal by the light receiving element 5, this signal is transmitted to the light receiving element 5 as shown in FIG.
・They are each led to a parallel/serial converter 6 through lead wires 5' and converted into a serial electrical signal, and the serial electrical signals are further led to an electrical/optical conversion element 7 through a lead wire 6' to be converted into a serial optical signal. The signal is then transmitted to a receiver 9 through a single optical fiber 8, and the receiver 9 converts the transmitted serial optical signal into an electrical signal to display the wind direction.

Since this invention has the above structure, only the parallel light beams emitted from the light emitting element in the wind vane that have passed through the slit of the low-return encoder plate are received by the light receiving element, and the other parallel light beams are received by the encoder plate. A combination of the parallel rays that are blocked and transmitted and the parallel rays that are blocked is obtained, and this combination is uniquely determined by the rotation angle of the row encoder plate, that is, the rotation angle of the wind vane, so this combination can be used as a signal. transmit to the receiver,
If the signal is converted into an electrical signal in the receiver, the combination can be immediately resolved to determine the angle of rotation of the wind vane, ie the wind direction.

This invention has the structure and operation described above.According to this invention, since the signal is transmitted to the receiver as an optical signal using an optical fiber, the signal transmission path is affected by power line opening/closing surges and lightning. A highly reliable signal can be transmitted to the receiver without noise being mixed in with the signal, such as surges, etc. Therefore, highly reliable wind direction information can be obtained, and optical fiber can be used as the signal transmission path. Because of this, even if an error occurs in the signal transmission path, the wind vane, receiver, and surrounding electrical equipment will not be damaged, and the signal is transmitted as an optical signal using optical fiber. Therefore, signals can be transmitted over long distances without repeating, and furthermore, although the lifespan of the sensor section in this invention depends on the lifespan of the light emitting element and the light receiving element, the lifespan of the pixel element is generally long. The sensor part can withstand long-term use, and because it uses a rotary encoder plate, the measured value does not fluctuate due to temperature changes, and the power to the light emitting element can be supplied cyclically intermittently for short periods of time. This reduces power consumption and makes it possible to use solar cells as a power source.Also, since the parallel signal from the sensor section is converted into a serial signal and the serial signal is transmitted to the receiver via an optical fiber, it is possible to use a -striped optical fiber. The excellent industrial, economical, and safety and maintenance effects of wind vanes, such as the ability to transmit wind direction information, are extremely remarkable.

Furthermore, the present invention can be suitably used when installed on a transmission line tower, etc., where noise is likely to get onto the signal transmission path, or when installed in a mountainous area, etc., where signal transmission over a long distance is required. can.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining a conventional wind vane, FIG. 2 is a perspective view for explaining the wind detection section of the wind vane according to the present invention, and FIGS. 3(a) and (b) are light emitting elements in FIG. 2. 4 is a diagram illustrating the light emitting interval of the light emitting element in FIG. 2, and FIG. FIG. 2 is a schematic diagram of main parts for explaining a transmission path for transmitting data to a receiver. ■... Absolute type rotary encoder, 2... Wind vane rotation axis, 3... Slit, 4... Light emitting element, 4'
・・Lead wire for light emitting element, 4″・Large lens for light emitting device, 5・Light receiving element, 5′・・Lead wire for light receiving device, 6 Parallel/serial signal converter, 6′・For electrical/optical signal converter device Lead wire, 7-electrical/optical signal conversion element, 8-optical fiber, 9-receiver.

Claims (2)

[Claims] (1) An absolute type rotary encoder plate with the rotating shaft fixed in the center through the plate at right angles so as to rotate integrally with the rotary shaft of the wind vane, and the reference diameter of the rotary encoder plate and the rotary encoder plate. slits drilled in the encoder plate, and lines perpendicular to the rotary encoder plate passing through respective intersections with the concentric circles formed by the slits bored in the encoder plate, and facing each other by the number of concentric circles with the rotary encoder plate sandwiched therebetween. A light-emitting element each equipped with a lens so as to emit parallel light, a light-receiving element that receives average light emitted from the light-emitting element, and a parallel/serial element that converts the parallel electrical signal from the light-receiving element into a serial electrical signal. a converting device, an element that converts a serial electric signal transmitted from the converting device into an optical signal, a line of optical fiber that transmits the serial optical signal to a receiver, and a solar cell that intermittently causes light emission from the light emitting device. What is claimed is: 1. An optical fiber transmission type wind vane, characterized by comprising: (2) Claim 1, wherein the number of light emitting elements is one, and the light emitted from the light emitting element becomes parallel light beams through one large lens, and serves as a light source for each light receiving element. Fiber optic transmission type wind vane.