JPS61182517A - Measuring instrument of azimuth - Google Patents

Abstract

PURPOSE:To display an azimuth and an elevation angle to a projector forming the 1st and 2nd optical fibers, a magnetic field detecting element tightly adhered to these fibers, the 1st and 2nd detectors, a means for detecting the size of a magnetic field, and a storage. CONSTITUTION:Light projected from a light source 11 is detected by a detector 17 through an optical fiber 14. On the other hand, light coupled with the optical fiber 15 side is transmitted through the optical fiber 15 wound around a magnetic distortion element 18 and detected by a detector 19. A phase difference corresponding to the size of a magnetic field in the X direction which corresponds to the distortion of a magnetic distortion element 18 is generated between the light rays detected by the detectors 17, 19. The output signals of the detectors 17, 19 are inputted to a signal processing circuit 4, which detects the phase difference between both the output signals and the size of the magnetic field component in the X axis direction. Similarly, the size of the magnetic field components in the Y and Z axis directions is detected by signal processing circuits 5, 6 respectively. The data of the size of the magnetic fields in respective directions in a space previously stored in a storage 8 are compared with data outputted from the signal processors 4-6 by a comparator 7 to display the azimuth and elevation angle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an azimuth measuring device that measures the direction of a magnetic field, such as earth's magnetism, and displays the azimuth.

[Technical background of the invention and its problems]

Conventionally, in portable flying vehicles, a person searching for a target and a person who launches the projectile are paired together, and after the person searching for the target searches for the target, the launcher directs the projectile toward the target. In this conventional method, the launcher cannot know the elevation angle and azimuth angle.1 For example, even if the target is detected by a central radar device and the target position is detected, the launcher directs the projectile in the requested direction. That was difficult. For the launcher, it is necessary to be able to grasp the pointing direction of the projectile in order to be able to accurately point the projectile in the direction in which the projectile is directed.0 [Object of the invention] Non-invention This was made in consideration of the above-mentioned circumstances, and the purpose is to provide an azimuth measuring device that can display the ten-man position and elevation angle during launch. [Summary of the Invention] The azimuth measuring device according to the present invention is , the stress generated in the magnetostrictive element in response to the magnitude of the magnetic field is transmitted to the original phino(), and the phase difference between the output light of the optical fiber and the output light of the optical fiber, which is not affected by the magnetic field, is detected and the magnetic field is In addition to detecting the magnitude of the magnetic field and comparing the magnitude of the magnetic field measured in advance in each direction of the space with the magnitude of the detected magnetic field, the direction of the magnetic field is detected and the direction is displayed0 [Invention Embodiment] Hereinafter, an embodiment of the direction measuring device according to the present invention will be described with reference to the drawings. FIG. 1 is a circuit configuration diagram illustrating an embodiment of the direction measuring device according to the present invention. In the configuration shown in Figure 1, the X axis,
An X-axis 41 output circuit (1), a YM@output circuit f2), and a Z-axis ff output circuit (3) are provided to detect the magnitude of the magnetic field in each of the three directions of the X-axis and Z-axis. X-axis detection circuit (1), X-axis detection circuit (2), Z-axis detection circuit (3)
), the magnetostrictive elements are arranged orthogonal to each other, but the other configurations are the same, so we will explain the X-axis detection circuit (1) and omit the explanation of the X- and Z-axes.The 0 light source αυ is , this light source σ is for example a laser diode.
The light from υ passes through the optical fiber α2 to the optical distribution means (1
For example, the zero light distribution means Q3 guided to 3 dBB10 separates the light from the optical fiber μ2 into light transmitted to the optical fiber I side and light coupled to the optical fiber uS side. Terminal ue is a non-reflection terminal. The light transmitted to the optical fiber α side is detected by the detector (17). The source coupled to the optical fiber ttS side is the magnetostrictive element (wound around The transmitted light propagates through the magnetostrictive element (15) and is detected by the detector (towards). Strain occurs in response to the magnitude of the magnetic field. The optical fiber (jl!19) The magnetostrictive element (18) is tightly wound around the α frame so as to expand and contract in response to the strain of the element (18). Therefore, the light propagating through the optical fiber (19) follows an optical path corresponding to the magnitude of the magnetic field in the X-axis direction. The optical fibers 7 and 9, which undergo phase changes due to changes in length, are each set to a length K such that their output lights are in phase when the magnetic field is zero. When the position measuring device is placed in a magnetic field, the magnetostrictive element αQ is distorted in response to the magnitude of the magnetic field in the X-axis direction.In response to this distortion, the light propagating through the optical fiber (Is) undergoes a phase change. detector u
A phase difference occurs between the light detected by the light and the light detected by the detector tll, which corresponds to the strain, that is, the magnitude of the magnetic field.
The signal processing circuit (4) receives the signal from the detector αη and the detector (0 which is supplied with the old output signal and detects the phase difference between the two output signals to detect the magnitude of the magnetic field component in the X-axis direction). The processing circuits (5) and (6) detect the magnitude of the magnetic field components in the X-axis direction and the Z-axis direction, respectively.
ilal path (4), 15), (6) 7) X axis,
Y@.

Each output signal representing the magnetic field component in the Z-axis direction is supplied to a comparator circuit (7). The 0 comparator circuit (7) calculates the magnetic field components in each direction of the space stored in advance in the memory (8). Magnitude data and signal processing circuit (4).

15) and the data from (6) are compared, and if the C data matches, a signal indicating the direction is output.0 The data of the magnetic field in each direction of the space measured in advance is stored in ), but the data to be stored may be data measured using the direction measuring device shown in FIG. 1, for example. The indicator (9) is supplied with a signal indicating the direction from the comparator circuit (7), and the 0 direction display for indicating the direction may be numerically displayed.
Furthermore, this azimuth measuring device, which may be constructed in a vector diagram, is useful for use in portable flying objects. That is, this azimuth measuring device is mounted on a portable flying object, and the x@, y@ of the azimuth measuring device is adjusted so that the orientation (elevation angle, azimuth angle) of the flying object is displayed on the direction indicator.

Set the Z-axis o When the projectile changes the direction of the projectile, the detected magnetic field components of the X-axis, X-axis, and Z-axis will change accordingly, and each newly obtained magnetic field component and memory ) A new direction will be displayed on the direction indicator based on the data of It is better to make Man 1 in advance.

According to this azimuth measuring device, when the portable flying object is pointed in any direction during launch, that direction is displayed, so it is possible to easily follow direction instructions from the outside. .

Figure 2 shows a cylindrical magnetostrictive element u8.

For example, an optical fiber (19) made of a magnetic material such as nickel is wound tightly so that the deformation of the magnetostrictive element is well transmitted.
(to) is made of a magnetostrictive material, and even in such a configuration, the optical fiber expands and contracts in response to changes in the magnetic field, so it can be used as a magnetic field detection element.0 [Advantages of the Invention] ] As explained above, according to the direction measuring device according to the present invention, any direction in space can be easily displayed, so that, for example, the direction of a portable flying object can be accurately set according to direction instructions from the outside. The practical effect is a dog0

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram illustrating an embodiment of an azimuth measuring device according to the present invention, and FIGS. 2 and 3 are diagrams illustrating a magnetic field detection element. μυ...Light source, αL (14), C15... Original fiber, (13... Distribution means, α$... Magnetostrictive element, αη
, (11...Detector, (4). +5), C6)... Signal processing circuit, (7)... Comparison circuit, (8)... Memory device, (9)... Display device. 11廿一] “薯翿■ -”

Claims (1)

[Claims] A light source that outputs light, a distributing means that divides the light from the light source into two, a first optical fiber to which one of the lights distributed by the distributing means is guided, and the other light distributed by the distributing means. a second optical fiber to which the magnetic field is guided; a magnetic field detection element that generates a strain corresponding to the magnitude of the magnetic field and transmits the strain to the second optical fiber to expand and contract the second optical fiber; a first detector that detects the output light from the optical fiber; a second detector that detects the output light from the second optical fiber; and an output signal of the second detector and the first detector.
means for detecting the phase difference with the output signal of the detector to detect the magnitude of the magnetic field; a memory device for storing in advance the measured value of the magnitude of the magnetic field in each direction of space; means for detecting the direction of the space corresponding to the magnitude of the magnetic field by comparing the information obtained by the magnetic field with the magnitude of the magnetic field detected by the means; and a display means that is supplied with a signal from the means and displays the direction. A direction measuring device equipped with.