JPS59202067A - Acceleration detecting apparatus - Google Patents

Abstract

PURPOSE:To simplify the constitution of a three-axial direction acceleration detecting apparatus of a rolling axis, a pitching axis and a yawing axis, by optically detecting the projection image movement of a light nontransmittable sphere freely supported in a light transmittable hollow container in respective axial directions. CONSTITUTION:A light nontransmittable sphere 11 is freely supported in a light transmittable hollow container 9 by a support mechanism 12 such as a spring. The movement of a projection image corresponding to the acceleration of said sphere 11 is optically detected by a light source 13 supported by a yawing axis, a slit 17 equipped with a pinhole, a cylindrical lens 20 and a photoelectric converter element array 23. Detection due to optical systems supported by a rolling axis and a pitching axis is similarily performed. Therefore, a three-axial direction acceleration detecting apparatus of the rolling axis, the pitching axis and the yawing axis is brought to simple constitution using one accelerometer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an acceleration detection device that detects all the accelerated motion of an artificial satellite or the like.

First, a conventional acceleration detection device will be briefly explained.

FIG. 1 is a block diagram of a conventional device of this type. In the figure (IJ
is the first coil, (21t;t second coil A=, +
The excitation circuit (4) sends an excitation signal to the 31U first coil via the cable (7), and the excitation circuit (4) serves as a detection mechanism to detect the induced electromotive force induced in the second coil (2) via the cable (7). The detection circuit (5) is inserted into the gap (8) between the first coil (1) and the second coil (2) and rotates around the shaft (6) as a support structure. The molecule is made of magnetic material and has a plate shape.

In this a-shaped configuration, a magnetic field is formed in the gap (8) formed between the first coil (υ and the second coil (2)) by the excitation signal sent by f@magnetic path 3. ing. This magnetic field is then detected by the second coil (2) and input to the detection circuit via the cable (7).

When an acceleration motion is applied to the acceleration detection device, the movement element (5
) A habitual force is generated that rotates around the entire axis (6).

ffi! Mover (5) rotates within #j gap (8).

At this time, the magnetic permeability of the gap (8) changes, so the power induced in the second coil (2) changes. Therefore, by detecting the induced power of the second coil (2) with the detection circuit (4), the intensity of the acceleration can be detected, so that it is widely used as an acceleration detection device for artificial satellites.

In addition, although a magnetic detection type example has been described here, a capacitance detection type that detects the displacement of the movable member (5) as a change in electrostatic capacity may also be used. In general, a servo mechanism is attached to the above-mentioned Kayo element (5), and the servo type detects all the servo motor drive power necessary to hold the Kayo element (5) at a constant position in response to changes in total acceleration. Acceleration detection devices are also used.

However, since the conventional acceleration detection device uses the amount of displacement of the Fi oscillator (5) in one direction, it is only possible to detect acceleration in one direction.
3 when trying to detect each direction component of pitch axis and yaw axis
There are problems in that the weight of the platform increases and the structure is complicated, making it difficult to meet the strict demands of weight management.

This invention solves the problems with conventional acceleration detection devices, has a simple configuration, and can handle three axes: roll, pitch, and yaw.
The present invention provides an acceleration detection device that detects acceleration in the axial direction, and will be described in detail below with reference to the drawings. Fig. 2 shows the components of an embodiment of the present invention, Fig. 3 is a plan view of the acceleration detection mechanism, Fig. 4 is an elevational view of the acceleration detection mechanism, and Fig. 5 is a configuration diagram of the photoelectric conversion element. It is.

In the figure, (9) is a hollow container configured with a light-transmissive plate to form an inter-wall GO) inside, and (11) is the space α.
A support mechanism that supports the light-impermeable sphere OD placed in the hollow container (9) inside the hollow container (9), for example, a spring f: supports the sphere aIJ and the hollow container (9) in six directions.
) so that the attached spheres αυ are pulled together with equal force.

0'' is a light source of 2'1 that projects light 06) in the direction of the roll axis Second light source.

05) is the 2nd and 3rd light source that projects light (161) in the direction of the yaw axis Z in FIG. 2, and 07 is the first light source Q31, 1
The screen is composed of an opaque plate having a hint mark uW in the center to give spatial coherence to the light 061 generated from the light source (14+) and the third light source (15). )9 is installed between each of the second light source 0Φ and the third optical image 0ω and the hollow container (9). (19) is the first light source a3), the second light component α
In order to receive the light (16) emitted from the light source 4 and the third light source 05) and to project the shadow of the spherical circle, a first light source made of a translucent plate is attached and attached to the hollow container (9). light receiving plate, (20+ is the light emitted from the first light source (131)
1 (il 'i first cylindrical lens that focuses light, (211
The second cylindrical lens condenses the light 116J\C emitted from the second light source α, and the 23 cylindrical lens condenses the light tJB)f emitted from the third light source a9.

(C) is a first photoelectric conversion element array (such as a CCD) that is placed near the focal point of the cylindrical lens □□□ and receives the condensed light 06) and converts it into electricity. A second photoelectric conversion element array (c) placed near the focal point of the second cylindrical lens Q]J receives and photoelectrically converts the condensed light 06), is placed near the focal point of the third cylindrical lens (22J). A third photoelectric conversion element array (of course) Fi which receives and photoelectrically converts the condensed light 06) placed in
9) is the drive circuit connected, @ is the data processing circuit connected to this drive circuit l) with a cable, c! 8+ is the first light source [131], the second light source (141 and the third light source)
The power supply connected to the light source α5) via the cable @, ■ is the photoelectric conversion element of the above-mentioned photoelectric conversion element array L23), the second photoelectric conversion element array (to), and the third photoelectric conversion element array) , al) is an image of the sphere (II).

Next, the operation will be explained. In FIG. 2, a sphere (lit) is supported with a degree of freedom in all directions by a support mechanism (121) inside the hollow container (9).
When it moves, relative fj: advances due to the sphere and inertia). On the other hand, the light (161) emitted from the first light source 03) reaches the screen αη.
Since the light +161 is provided with a pinhole (1 & b), the light +161 is given spatial coherence by the pinhole & and enters the hollow container (9). The light incident on (9) (+61ij: is backlit by the sphere 0υ and forms an image on the light receiving plate (19). This image is focused by the cylindrical lens (20) and is directed onto the first photoelectric conversion element array (23). image (31) as shown in Figure 5.
make.

The image information of the first photoelectric conversion element array is read out by the drive circuit □□□j in FIG. 2, edited by the data processing circuit, and sent out as acceleration detection data. Now, in Figures 3 and 4, when the two spheres move three-dimensionally in any direction, the roll axis X and the pitch l7ill
The amount of deviation in the IY direction is compressed by the cylindrical lens (20),
The amount of deviation in the yaw axis Z direction is detected as the amount of movement of the image (3).Therefore, the photoelectric conversion elements t301 of the first photoelectric conversion element array c!3) do not need to be arranged in multiple rows. A single 9-near array would be sufficient. Therefore, data acquisition can be speeded up.

Since the above operation is the same for the directions of the pitch axis Y and the yaw axis Z, the image (31) in FIG. 5 is also projected on the second photoelectric conversion element array 2 and the third photoelectric conversion element array That will happen. fc, the photoelectric conversion element array □□□) of above 'A'1), the second photoelectric conversion element array (
2) By reading the position of the image f3'IJ from each of the third photoelectric conversion element array 1.25+, all accelerations in each direction of the roll axis X, pitch axis Y, and '3-axis Z are detected and a three-dimensional acceleration vector is obtained. can be detected.

As explained above, according to the present invention, it is possible to detect one three-dimensional acceleration vector with an acceleration detection device, which was conventionally detected using three accelerations Jt, and the weight is reduced by 2 (compared to 40f~ (It used to be 80F, but it becomes about 201.) It has been made into a J-type (conventionally, one piece was 30-X 40 +,
Although it was a fake, it is about 30 pieces x 30 pieces) It can be used for various applications. For example, if this acceleration detection device is used to monitor the partial movement of a solar array paddle of an artificial satellite, a three-dimensional acceleration vector can be detected at the same position, and the situation of partial movement can be accurately grasped. Since it is roughly i@, it is difficult to apply disturbance factors to the drive, so it is possible to achieve a high degree of a.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a conventional acceleration detection mechanism, FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is a plan view of the acceleration detection mechanism, and FIG. 4 is an elevation view of the acceleration detection mechanism. FIG. 5 is a block diagram of a photoelectric conversion element. In the figure, fl) is the first coil, (2) is the second coil,
(3) is the excitation circuit, (4) is the detection circuit, (5) is the vibrator, and (6) is the shaft. (7) is cable, (8) is gap, +91rri
A medium container, not is a space, Oj) is a sphere, (121
is the support mechanism, 03) is the first light DL (14Iu3-2
O photoelectric, (H+li'i73) photoelectric (161U
light. Q71 is a screen (I~ is a vinyl pole, a9) is a light receiving plate. (20) is the first cylindrical lens, (2D second cylindrical lens. @Fi third cylindrical lens, (23+ is the first photoelectric conversion element array, 1241 is the second photoelectric conversion element array 1.
(c) is the third photoelectric conversion element array, G) is the drive circuit, data processing circuit is shown, (support) j is the power supply, (5)) is the cable, A is the photoelectric conversion element, (3D is the image) In addition, the same reference numerals are attached to the middle parts or equivalent parts in Figure 1. Figure U Figure 2 Figure 3

Claims (1)

[Claims] In an acceleration detection device, a vibrator is mounted on an object that performs accelerated motion using a support mechanism, and is equipped with a detection mechanism that detects the movement of the vibrator, wherein the vibrator is composed of a light-impermeable sphere, a hollow container formed with a light-transmitting plate and having a space therein; a support mechanism that freely supports the sphere in all directions within the space of the hollow container; and a roll axis and a pitch perpendicular to each other of the hollow container. a light source that projects light on the axes of the axis and the yaw axis; a screen that receives the light projected from the light source and is configured with a semitransparent plate having a pinhole;
A light receiving plate consisting of a translucent plate attached to the side of the hollow container facing the screen, a cylindrical lens facing the light receiving plate, and a cylindrical lens placed near the focal point of the cylindrical lens. A photoelectric conversion probe array is provided, and the amount of deviation of the sphere in the three orthogonal directions is detected as the amount of movement of the image of the sphere, thereby detecting the three-dimensional vector of the acceleration motion. An acceleration detection device that detects