Sun attitude pickup

FIELD: measuring equipment, applicable for determination of the Sun angular coordinates in the spacecraft coordinate system.

SUBSTANCE: the Sun attitude pickup has an optical system made in the form of a wide-angle lens including an inlet and outlet plano-convex lenses with a diaphragm placed between them, an optical element is positioned in its holes, matrix photodetector, and a unit for processing of information and computation of coordinates. The refractive indices of the optical components are selected proceeding from the relation: n1≥n2<n3, where n1 - the refractive index of the inlet plano-convex lens; n2 - the refractive index of the optical element; n3 - the refractive index of the outlet plano-convex lens.

EFFECT: obtained information in a wide angular field with a high precision.

3 cl, 1 dwg

 

The invention relates to the field of measurement technology and can be used to determine the angular coordinates of the luminous reference point and, in particular, to determine the direction of the Sun in the coordinate system of the spacecraft.

The prior art devices of optical tracking in one way or another astronomical object, including the Sun, which determines the deviation of its coordinates relative to the base coordinate system, such as: U.S. patent No. 3638621 And, CPP 250-203R, publ. 25.01.77,, A.S. No. 1779931, CL G01C 21/24, publ. 92,, patent RU No. 2104493 C1, CL G01C 21/24, publ. 10.02.98,, patent RU No. 2131587 C1, CL G01C 21/24, publ. 10.06.99, These devices mainly contain optical system, photodetector, scanning the host computing device and the Executive block.

The disadvantage of these sensors is the low reliability and accuracy due to the presence of mobile elements in the links of the gimbal, and, as a consequence, the errors due to friction, backlash, inaccurate reading information from the angle sensors, etc. made with these elements in the operation of the device.

This disadvantage is eliminated in the position sensors radiation performed on the matrix radiation detector, by eliminating moving parts tracking systems for measuring axes, which are described in the sources: patent FR No. 9601813, to the. G01J 1/20, publ. 02.14.96 G., US patent No. 4792245, CL G01J 1/20, (NPK 250/203), publ. 27.12.88 G., US patent No. 6853445 B2, CL G01J 1/00 (CDD 356/121), publ. 02.08.05. These devices provide control of the orientation of an orbiting Earth satellite (spacecraft) and consist of cameras, made with an input box, for example, in the form of a slit or slits or with an input box, which has the simplest optical element, the matrix of the radiation receiver and the electronic unit generating signals representing the angle at which the radiation falls on the sensor.

The disadvantage of these sensors is the limited field of view associated with the design of the input window and the optical properties of the matrix. At large angles (>68°) photometric loses sensitivity and stops working.

Closest to the claimed object to the technical essence is the sensor patent RU No. 2020419, CL G01C 21/24, publ. 30.09.94, the Sensor includes an optical system made in the form of a wide-angle lens type fisheye, including input and output convex lens, placed between them, the field diaphragm, the matrix photodetector (mppw), attached to the outer surface of the exit lens, and the processing unit, and calculating the angular coordinates.

The disadvantage of the prototype is limited information content related to the fact that the rays of the light flux at large angles of incidence, after passing through the input lens, get on the aperture made in the form of an air gap, for example, in fractions of a micron, resulting in their total internal reflection and the rays do not fall on the output lens and, as a consequence, there is no information about the angular position of the Sun. In addition, the shape matrix of the receiver repeats the shape of the output lens and rigidly attached to it, which makes it impossible to install an optical filter in front of the photodetector and to reduce chromatic aberration, which lead to a deterioration of accuracy, and making this type of sensor is expensive and ethnologica.

The objective of the invention is to provide a sensor of angular position of the Sun, providing information in a wide angular field of view with high accuracy for determining the angular coordinates of the radiation source.

The technical result of the invention is expressed in the increase in the volume of information received at large angles of incidence of the light flux by eliminating the effect of total internal reflection, in obtaining high accuracy characteristics and manufacturability of the device.

This result of the proposed solutions is achieved by the fact that in the known device containing the optical system, made in the form of a wide-angle lens that includes input and output pleskovic the s lenses, located between the aperture matrix photodetector and processing unit of the information and calculations of the angular coordinates in the aperture are placed optical element and the refractive indices of the input convex lens n1optical element n2and output convex lens n3selected based on the ratio

n1≤n2<n3.

Thus, before a photodetector matrix installed the filter and aperture are placed optical element. It is located on the optical axis at the center of curvature of the output PLANO-convex lens made in the form of a hemisphere.

A causal relationship between the set of essential features and achieve the result is that the added optical element mounted in the aperture, and the ratio of the refractive indices provide a signal from the radiation source (the Sun) on mfpu within more than 180° without distortion and large losses of luminous flux, because it excludes the effect of total internal reflection. Moreover, if necessary, to reduce chromatic aberration is set to filter, and using mfpu flat type makes the device cheap and high-tech.

The device proposed sensor posna the tsya drawing.

Shown in the drawing are shown: input PLANO-convex lens 1, is optically coupled through the optical element 2'is placed in the aperture 2, the output convex lens 3 and the optical filter 4 with mfpu 5, the output of which is connected to the input of the processing unit and calculate the angular coordinates 6. Between the lenses 1 and 3, a diaphragm 2 made in the form of a light-tight cover with a hole in the center.

The inventive device operates as follows. Luminous flux from the Sun S1or S2(depending on the position of the radiation source) passes through the PLANO-convex lens 1 of the optical element 2'mounted in the diaphragm 2, the lens 3, the optical filter 4 and is projected on the surface of mfpu 5. If the Sun is located on the optical axis of the sensor (see S1), the radiation is focused in the centre of mfpu 5, when the deviation of the Sun from the vertical (see S2), for example, it is located at an angle of 90° to the optical axis of the device, the radiation is focused on the sensitive element of mfpu 5, located on the edge of it, with the angular coordinate of the Sun is associated with the room lit sensitive element mfpu 5, the signal of which is supplied to the processing unit and calculate the angular coordinates 6. All calculations are performed on pre-defined algorithms defined is in accordance with the programme of work of the sensor. The obtained information is transmitted to the Executive system, which is rigidly connected the claimed device.

When implementing the proposed sensor lenses can be made, for example, from an optical material such as HF and LC, as mfpu it is advisable to use multi-element matrix photodetector type LM 9638, the diaphragm is made by drawing on a flat surface of one of the lenses of chromium, followed by etching of the holes needed (volume). As an optical element, disposed in the displacement of the diaphragm, it is possible to use polymers or compositions based on them (optical adhesive), and the processing unit and calculate the angular coordinates can be implemented on microprocessors, for example, "lack Fin" firms receiver analong Devices.

Thus, the proposed solution meets all the necessary requirements for this type of devices, namely:

- has a large field of view (π and more);

- high accuracy under all operating conditions;

- small weight and size characteristics;

- high reliability;

- relatively low cost;

technology in the manufacture.

1. The sensor of angular position of the Sun, containing the input and output convex lens, located between the aperture matrix is otobrannoe device and the processing unit, and calculating the angular coordinates, characterized in that the aperture is placed optical element; and the refractive indices of the input convex lens n1optical element n2and output convex lens n3selected based on the ratio

n1<n2<n3.

2. The sensor according to claim 1, characterized in that before a photodetector matrix installed the filter.

3. The sensor according to claim 1, characterized in that the aperture diaphragm is placed coaxially with the optical axis at the center of curvature of the output PLANO-convex lens made in the form of a hemisphere.



 

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