Optical system of spectrum divider for ir-area of spectrum

FIELD: physics.

SUBSTANCE: optical system of spectrum divider for IR-area of spectrum comprising flat-parallel plate with spectrum-dividing coat installed at the angle of 45 degrees to optical axis differs by the fact that plate is located in convergent bundle of beams in space for objective image, downstream compensator of aberrations is installed comprising two lenses: the first one located along with beams travel is positive with convex first surface and cylindrical second surface, the second one is plano-concave that it inverted with its concavity to image and displaced in meridional plane along with direction perpendicular to optical axis.

EFFECT: creation of optical system of spectrum divider for instruments that operate simultaneously in two different ranges of spectrum IR-area with simultaneous increase of aberrations correction quality and reduction of instrument dimensions.

3 dwg, 4 tbl

 

The invention relates to optical systems and can be used as a nozzle, separating beams for different ranges of the infrared region of the spectrum in the infrared imaging devices.

In known optical circuits "SU-15 and SU-16" (Vaganov, Londres. Optika microscopes. Leningrad, 1976, page 317-323), designed to separate light in the visible spectrum, are used splitters made in the form of a cube prisms. However, in the infrared region of the spectrum, the application of these splitters is not feasible due to the lack of glue, transparent in this area.

In the patent of Russian Federation No 2.187.138, IPC G02B 23/12, F41G 1/40, the filing date 27.07.2000, in order to separate rays spectra used prismatic block, which transmits the rays in the visible spectrum and reflects the infrared rays. Use this block in devices operating with two channels on two different bands of the infrared spectrum, it is not possible.

The closest analogue to the claimed technical solution and selected as the prototype is U.S. patent No 5.022.723, IPC G02B 23/04, G02B 23/08, publ. 11.06.1991, in order to spectroline used hatchback spectrometrically plate, located in the parallel beam of rays. Spectrometrically plate transmits rays in the infrared region of the spectrum and reflects the visible rays. The disadvantages of this spectrometrically systems which are obligatory presence of a plate with a large luminous diameter and the necessity of using two separate lenses, leading to the increase of the dimensions of the device as a whole.

The invention solves the problem of generating optical system spectrochemical for devices operating simultaneously in two different bands of the IR spectrum with simultaneous quality improvement aberration correction and reduction of the dimensions of the device.

The technical result due to the specified task is achieved by the creation of an optical system spectrochemical for the infrared spectral region, comprising a plane-parallel plate with spectrometrically floors, located in a convergent bundle of rays in the image space of the lens and set at an angle of 45 degrees to the optical axis, and installed it the aberration compensator consisting of two lenses, the first as the rays of which is positive with a convex first surface, the second surface of which is cylindrical, the second compensator lens-concave, facing concavity to the image and shifted in the meridional plane in the direction perpendicular to the optical axis.

The claimed technical effect is explained as follows. Inclined plate with spectrometrically coating performs the function of separating beams for different ranges of the infrared region of the spectrum and its location in the converging beam enables the use of only a single lens for DV the x channel, which leads to the reduction of the dimensions of the device. The aberration compensator of decentering made located in a convergent beam inclined plate, performed as advertised, eliminates astigmatism and coma. In addition, to reduce chromatic aberration all optical parts made of material with a low dispersion in the specified spectral range, for example Germany.

The invention is illustrated by drawings and tables, in which figure 1 shows an optical diagram of the inventive system, in tables 1-4 presents the design parameters and the values of the aberrations of the options proposed optical system, figure 2 and figure 3 presents the frequency-contrast characteristics of these options.

Optical diagram of the inventive system consists of an inclined angle of 45 degrees to the plane-parallel plate 1 with spectrometrically floors, located in a convergent bundle of rays in the image space of the lens and the aberration compensator consisting of two lenses. The first lens 2 of them with positive convex first surface, the second surface of which is cylindrical; the second lens 3-concave, facing concavity to the image and shifted in the meridional plane in the direction perpendicular to the optical axis.

Operation of the proposed scheme is revealed in this way. The infrared rays, roselie the last lens surface, get on the first flat surface of the plate 1. This surface reflects the rays of a certain range of the infrared region and ignores the rest of the rays of the infrared range, for example, reflects the rays in the range of 3-5 μm and transmits rays in the range of 8-14 μm. The reflected rays to create an image of A1B1(see figure 1) object on the sensitive surface of the first receiver, and missed the rays pass through the turn of the lenses 2, 3 and create the image And2In2object on the sensitive surface of the second receiver.

Table 1 shows the design parameters of the system spectrochemical for the first variant, where the transmitting range of the plate 3-5 μm, the plate is located at an angle of 45 degrees to the optical axis and the lens has the following characteristics:

- Value image y'=5 mm

- Numerical aperture in image space A'=0.25

- The last portion of the lens s'=59 mm

Table 2 shows the aberration of the rays emanating from the axial (No. 0) and extreme (No. 1) bundles on the subject of the first option. Column NLU specifies the number of rays in the beam. The column W(0) indicates the corresponding wave aberration.

Table 3 shows the design parameters of the system spectrochemical for the second option, where a transmissive range of the plate 8 to 14 μm, and the lens has the following characteristics:

- The value of the image is agenia y'=5 mm

- Numerical aperture in image space A'=0.25

- The last portion of the lens s'=50 mm

Table 4 shows the aberration of the rays emanating from the axial (No. 0) and extreme (No. 1) bundles on the subject of the second option.

Figure 2 shows graphs of the frequency-contrast characteristics (MTF) of the first variant of the system. On the x-axis is the spatial frequency N mm-1referred to the image plane of the lens, and on the y - axis transfer coefficients of the contrast T in relative units, and the curve I shows the MTF in the sagittal surface, and curve II in Meridian.

Figure 3 shows the MTF charts of the second variant of the system.

The proposed optical system spectrochemical for the IR spectral range is designed for devices running simultaneously with two separate receivers IR region of the spectrum, and provides a reduction of the dimensions of the device as a whole, through the use of a single lens, and has a high quality correction of aberrations in the respective angular field of the lens.

Currently tested optical system and the calculation of the elements of the optical system of spectrochemical, and investigated its characteristics.

It is expected the construction of the apparatus with the inventive optical scheme.

/tr> .810-3
Table 1
No. PAEThe radius of curvature (mm)Thickness (mm)MaterialThe refractive index for λ=4 μmLight diameter (mm)Move along the Y axis relative to optos (mm)
1*018The air140.50
202Germanium4.039357.60
3013.043The air1 56.70
4191.7162.8Germanium4.039323.30.251
5**Cylinder0.15The air122.80
602.8Germanium4.039322.60
7183.43125.30The air121.9-0.53
80The air1110.753
Note table 1:
"*" - Fixed surface and the last lens surface,
"**" - Cylindrical surface has a generatrix parallel to the vertical axis (the Y axis), and the following equation: x2- 19908.86z+z2=0.
Table 2
N BEAM=0
NLUMULAGC'GD'DN'DF'W(0)
000-.00870-.53-30.527-3
Y10.2500-0.2640.003160.00316-.0263
030.1770-0.1830.460-30.460-3.00266
X 6-0.17700.1820-.77-30.766-3-.0051
08-0.25000.2620-.00270.00265-.0344
900.250-.34-3-0.260.308-4-.27-3.272-3-.0727
11 00.177-.17-3-0.181-.32-4.00163.00163-.0568
410.1770.177-0.186-0.184.561-3.00163.00172-.0502
430.1250.125-0.129-0.128-.19-3.00169.00170-.0270
49-.177 0.1770.185-0.184-.30-3.00115.00119-.0517
51-0.1250.1250.129-0.128.262-6.00165.00165-.0307.
N BEAM=1
NLUMULAGC'GD'DN'DF'W(0)
000-.010304.9204.92
Y10.2500-0.2640.004930.00493-.0920
5.0030.1770-0.1830.001910.00191 -.0327
X6-0.17700.1820-.00350.00351-.0584
08-0.25000.2620-.00760.00760-0.158
900.250-.39-3-0.261-.47-3 -.0022.00223-.0126
1100.177-.19-3-0.181-.26-3.278-3.379-3-.0267
410.1770.177-0.187-0.185.00176-.20-3.00177-.0459
430.1250.125-0.130-0.128.522-3.964-3-.0273
49-0.1770.1770.185-0.184-.0036.540-3.00362-.0901
51-0.1250.1250.129-0.128-.0019.987-3.00212-.0446

Table 3
No. PAEThe radius of curvature (mm) MaterialThe refractive index for λ=10.6 µmLight diameter (mm)Move along the Y axis relative to opt. axis (mm)
1*020The air135.80
203Germanium4.00448.70
3013.071The air147.40
4210.3412.5 Germanium4.00418.70.381
5**Cylinder0.15The air118.30
602.0Germanium4.00418.10
7205.9715.056The air120.4-1.415
80The air110 1.73
Note table 3:
"*" - Fixed surface and the last lens surface,
"**" - Cylindrical surface has a generatrix parallel to the vertical axis (the Y axis), and the following equation: x2-4672.7z+z2=0.
Table 4
N BEAM=0
NLUMULAGC'GD'DN'DF'W(0)
000-.02060-.00490 .00490
Y10.2500-0.2660.002050.00205-.0104
030.1770-0.1840.496-30.496-3-.0026
X6-0.17700.1820-.14-30.141-3
08-0.25000.2610.658-30.658-3-.0014
900.250-.82-3-0.257.657-5-.0046.00462-.0215
1100.177-.40-3-0.179-.71-4.00134.00135-.0292
410.1770.177-0.188-0.183-.0013-.62-3.00140-.0147
430.1250.125-0.130-0.127-.51-3.00171.00178-.0153
49-0.1770.1770.185-0.181.00253-.0014.00287-.0114/td>
51-0.1250.1250.129-0.126.600-3.00168.00179-.0162
N BEAM=1
NLUMULAGC'GD'DN'DF'W(0)
000-.020804.9004.90
Y10.2500-0.2660-.00170.001740.0237
5.0030.1770-0.1840-.00160.001590.0111
X6-0.17700.1820-.00130.00132-.0072
08-0.25000.2610-.00240.00238-.0201
900. 250-.81-3-0.257-.0012-.01000.01000.0406
1100.177-.40-3-0.179-.67-3-.0024.00248.00160
410.1770. 177-0.188-0.183-.0040-.0056.006860.0399
430.1250.125-0.130-0.127-.0020-.0015.00250.00919
49-0.1770.1770.185-0.182.604-3-.0037.00378.00389
51-0.1250.1250.129-0.126-.15-3-.30-3.335-3-.0053

Optical system spectrochemical for the infrared spectral region, comprising a plane-parallel plate with spectrometrically the floor, set at an angle of 45° to the optical axis, characterized in that the plate is located in a convergent bundle of rays in the image space of the lens, and it filled the aberration compensator consisting of two lenses, the first as the rays - positive with a convex first surface, a second surface which is cylindrical, the second lens compensator - - concave, facing concavity to the image, and offset in the meridional plane in the direction perpendicular to the optical axis.



 

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