RU2641514C1 - Solar radiation simulator - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: simulator contains an arc light source around which the same channels are evenly set, each of which contains a condenser with an aperture diaphragm, a mirror set at an angle to the optical axis, a field diaphragm, and a collimating lens. The axis of the arc light source is located parallel to the optical axis of the collimating lens. The following relations are performed: D_c≤D_m.m.-D_con.m.;

Δy_con.max.≥d_f.d., where D_c - the diameter of the collimating lens; D_m.m., D_con.m. - the diameters of the main and secondary mirrors of the test mirror-lens objective; N_ch - the number of channels in the simulator; Δy_con.max - the value of the transverse spherical aberration of the condenser at the maximum value of the aperture diaphragm; d_f.d. - the diameter of the field diaphragm.

EFFECT: reduction of the diameter of the collimating lens while maintaining a uniform brightness distribution over the field of the test lens, the possibility of measuring large-sized mirror-lens objectives.

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Description

The present invention relates to the field of optoelectronic technology, and the patented solar radiation simulator can be used as a focal plane illuminator for photometric calibration of large-sized optoelectronic channels of space satellites.

The well-known solar simulator IS-100 (manufactured by LOMO FOTONIKA LLC, St. Petersburg, Chugunnaya St., 20), using a xenon lamp and mirror optics. The IS-100 contains a condenser - an ellipsoidal mirror, in one of the foci of which a xenon lamp is located, and which projects an enlarged image of the luminous plasma into the plane of the diaphragm located in the second focus of the ellipsoidal mirror and acting as the exit pupil of the simulator. The focus of the off-axis paraboloidal mirror is also located in the plane of the diaphragm, which creates a parallel beam of rays, which is used to irradiate the optical system under test. To increase the uniformity of illumination, a spherical mirror is located on the side opposite from the ellipsoidal mirror from the xenon lamp.

The disadvantage of this simulator of the Sun is the small diameter of a parallel beam of rays (100 mm) and the use of two aspherical surfaces

The closest in technical essence is the simulator of the Sun (copyright certificate No. 339464, publ. 05.24.1972), which contains a xenon arc lamp, which is displayed on the field diaphragm mounted in the front focus of the collimator lens using a condenser. To align the brightness along the field of the arc of the light source from the side opposite the condenser, a spherical reflector is installed, projecting its inverted image onto the arc. In addition, to align and create a symmetric distribution of the brightness of the arc image on the diaphragm, a mirror system is installed between the diaphragm and the condenser, consisting of three mirrors, two of which are located at an angle to the optical axis, and the third parallel to it. This mirror system is driven by a drive.

The disadvantage of this simulator of the Sun is the presence of rotating optical mirrors, as well as the required large diameter collimator lens for use in conjunction with a large calibrated optical system (Cassegrain, Ritchie-Chretien systems with diameters of the main mirror of ~ 1 m or more).

The objective of the present invention is the elimination of rotating optical elements, reducing the diameter of the collimating lens while maintaining a uniform distribution of brightness across the field of the tested lens and with the ability to measure large-sized mirror lenses.

The technical result due to the task is achieved by the fact that in a solar radiation simulator consisting of an arc light source, a condenser, a mirror mounted at an angle to the optical axis, a field diaphragm and a collimating lens, in contrast to the known one, the condenser contains an aperture diaphragm, axis the arc light source is parallel to the optical axis of the collimating lens, and the same channels are uniformly installed around the arc light source, each of which contains a capacitor with an aperture diaphragm, a mirror mounted at an angle to the optical axis, a field diaphragm and a collimating lens, moreover, in the solar radiation simulator, there are relations:

;

;

;

;

,

,

where D _to - the diameter of the collimating lens channel simulator of solar radiation;

D _hl - the diameter of the main mirror of the test mirror lens;

D _counter - the diameter of the secondary mirror of the test mirror-lens;

N _to - the number of channels in the simulator of solar radiation;

Δy _con.max. - the magnitude of the transverse spherical aberration of the condenser at the maximum value of the aperture diaphragm d _ad.max ;

d _p.p. - diameter of the field diaphragm.

A diagram of one of the channels of the simulator of solar radiation is shown in figure 1.

The channel of the solar radiation simulator consists in the direction of the rays from the arc light source 1, the condenser 2, the aperture diaphragm 3, the inclined mirror 4, the field diaphragm 5 and the collimating lens 6.

The design data of a variant of the channel simulator of solar radiation in the reverse path of the rays are shown in table 1.

In the drawing of FIG. 2 shows the relative position of two oppositely located channels of the solar radiation simulator 7, 8 and the test lens of large diameter 9.

In the drawing of FIG. 3 shows the relative position of ten channels of the solar radiation simulator 10 evenly spaced around the circumference and a large diameter test lens 9.

In the drawing of FIG. 4 shows the image spreads of the arc light source 1 in each of the channels of the simulator of solar radiation and the distribution of the pupils of the channels of the simulator along the annular entrance pupil of the large specular mirror lens under test.

The principle of operation of the simulator of solar radiation is as follows.

The axis of the arc light source 1 is parallel to the optical axis of the collimating lens 6 (Fig. 1), and the same channels 7 are uniformly installed around the arc light source (Fig. 2, Fig. 3), while the collimating lenses 6 fill the annular entrance pupil of the test large-sized mirror the lens 9 is uniform in circumference and the ratio is:

In each channel, the luminescence region of the xenon arc lamp 1 with the help of a condenser 2 (Fig. 1) is displayed on the field diaphragm 5 mounted in the front focus of the collimating lens 6, while the number of channels is selected from the ratio:

The alignment of brightness along the field of the arc of the light source 1 and the creation of a symmetric distribution of the brightness of the image of the arc is carried out in the focal plane of the test lens 9 by superimposing on each other the images of the arc 1 'by each channel, while the image of the arc 1' from each of the subsequent channels is deployed relative to the image G from each of the previous channels, respectively, to the angles of the rotation of the channels relative to each other (Fig. 4), as well as due to the increased spherical aberration of the condensers 2, while wearing:

Δy _con.max. ≥d _pa

The diameter of the field diaphragm 5 forms the angular size of the sun.

When changing the diameter of the aperture diaphragm 3, the energy of the illuminated focal plane of the test lens 9 is changed.

Thus, the parameters of the embodiment of the simulator of solar radiation can be as follows:

Schemes for constructing measurable lenses Cassegren, Ritchie-Chretien et al. Diameter of the entrance pupil of the lenses ~ 1 m or more. Spectral composition of radiation It is close to the spectrum of radiation from the sun. Focal plane irregularity 5%, no more.

Thus, a solar radiation simulator containing a set of channels with small diameter collimating lenses compared to the diameter of the main mirror of the test lens allows one to reduce the complexity and manufacturing cost of the simulator optics in comparison with the classical collimator requiring a collimating lens with a diameter equal to the diameter of the test mirror lens, while maintaining the uniformity of irradiation of the focal plane of the test lens and without the use of rotating optics elements.

Claims (10)

A solar radiation simulator consisting of an arc light source, a condenser, a mirror mounted at an angle to the optical axis, a field diaphragm and a collimating lens, characterized in that the condenser contains an aperture diaphragm, the axis of the arc light source is parallel to the optical axis of the collimating lens, and around the arc equal channels are uniformly installed in the light source, each of which contains a condenser with an aperture diaphragm, a mirror mounted at an angle to the optical axis, a field diaphragm Ragmu and a collimating lens, and in the simulator of solar radiation, the following relationships take place:

where D _to - the diameter of the collimating lens channel simulator of solar radiation; D _hl - the diameter of the main mirror of the test mirror lens; D _counter - the diameter of the secondary mirror of the test mirror-lens; N _to - the number of channels in the simulator of solar radiation; _{Δу con.max} - the value of the transverse spherical aberration of the condenser at the maximum aperture diaphragm; d _p.p. - diameter of the field diaphragm.

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