KR102711005B1 - Apparatus and method for aligning hyperspectral reflection grating elements using optical elements - Google Patents

Abstract

A device according to an embodiment of the present invention comprises: a laser device emitting a laser with a primary mirror; the primary mirror reflecting the laser with a spectroscopic element and reflecting a plurality of lasers emitted from the spectroscopic element with an optical element; the spectroscopic element spectroscopically emitting the reflected laser and emitting the same to the primary mirror; the optical element indicating transmission positions corresponding to the reflected lasers; and a spectroscopic element aligner adjusting an angle of the spectroscopic element based on the transmission positions.

Description

{APPARATUS AND METHOD FOR ALIGNING HYPERSPECTRAL REFLECTION GRATING ELEMENTS USING OPTICAL ELEMENTS}

The present invention relates to a device and method for aligning a spectroscopic element using an optical element.

In the case of general hyperspectral optical system assembly and alignment, the central axis (0th order) is confirmed, and then the spectral elements and detectors are moved to align in the direction that improves spectral performance.

In general, optical systems were aligned by aligning and integrating the front optical system for viewing the image and the spectroscopic optical system for spectroscopic analysis, respectively, due to uncertainty in the position of the spectroscopic elements.

In this way, since the alignment is performed using two compensators for the spectrophotometer and the detector, there is a problem that the number of variables increases and the uncertainty in assembly and alignment increases.

The present invention provides a device and method for simplifying the assembly and alignment procedure of a spectroscopic element.

The present invention provides a device and method for optimizing the position of a spectroscopic element.

A device according to an embodiment of the present invention comprises: a laser device emitting a laser with a primary mirror; the primary mirror reflecting the laser with a spectroscopic element and reflecting a plurality of lasers emitted from the spectroscopic element with an optical element; the spectroscopic element spectroscopically emitting the reflected laser and emitting the same to the primary mirror; the optical element indicating transmission positions corresponding to the reflected lasers; and a spectroscopic element aligner adjusting an angle of the spectroscopic element based on the transmission positions.

A method according to an embodiment of the present invention comprises: a process of emitting a laser from a primary mirror in a laser device; a process of reflecting the laser from the primary mirror to a spectroscopic element; a process of spectroscopically emitting the reflected laser and emitting the spectroscopic element to the primary mirror; a process of reflecting a plurality of lasers emitted from the spectroscopic element from the primary mirror to an optical element; a process of displaying, in the optical element, transmission positions corresponding to the reflected lasers; and a process of adjusting, in a spectroscopic element aligner, an angle of the spectroscopic element based on the transmission positions.

The present invention can reduce assembly and alignment variables of an optical system by optimizing the angle of a spectroscopic element using an optical element.

The present invention can simplify the assembly and alignment procedures of a spectroscopic element.

The present invention enables accurate confirmation of the mounting position of a spectroscopic element.

The present invention can reduce variables for assembly and alignment.

FIG. 1 is an exemplary diagram of an alignment optical element according to an embodiment of the present invention.
FIG. 2 is an exemplary diagram showing a case where an aligned optical element is mounted on the detection surface of a reflective hyperspectral optical system according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a detector of an aligned optical element mounted on a detection surface of a reflective hyperspectral optical system according to an embodiment of the present invention.
FIG. 4 is a drawing showing an application photograph of an optical element for alignment according to an embodiment of the present invention.
FIG. 5 is a flowchart illustrating a method for aligning a spectroscopic element using an optical element according to an embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described with reference to the attached drawings. However, it should be understood that the technology described in the present invention is not limited to specific embodiments, but includes various modifications, equivalents, and/or alternatives of the embodiments of the present invention. In connection with the description of the drawings, similar reference numerals may be used for similar components.

In the present invention, expressions such as “have,” “can have,” “include,” or “may include” indicate the presence of a corresponding feature (e.g., a component such as a number, function, operation, or part), and do not exclude the presence of additional features.

In the present invention, the expressions "A or B", "at least one of A and/or B", or "one or more of A or/and B" can include all possible combinations of the listed items. For example, "A or B", "at least one of A and B", or "at least one of A or B" can all refer to cases where (1) at least one A is included, (2) at least one B is included, or (3) both at least one A and at least one B are included.

The expressions "first", "second", "first", or "second" used in the present invention can describe various components, regardless of order and/or importance, and are only used to distinguish one component from another component, but do not limit the components. For example, a first user device and a second user device can represent different user devices, regardless of order or importance. For example, without departing from the scope of the rights described in the present invention, a first component can be named a second component, and similarly, a second component can also be renamed as a first component.

When it is stated that a component (e.g., a first component) is "(operatively or communicatively) coupled with/to" or "connected to" another component (e.g., a second component), it should be understood that said component can be directly coupled to the other component, or can be connected via another component (e.g., a third component). On the other hand, when it is stated that a component (e.g., a first component) is "directly coupled to" or "directly connected" to another component (e.g., a second component), it should be understood that no other component (e.g., a third component) exists between said component and the other component.

The expression "configured to" as used herein can be used interchangeably with, for example, "suitable for", "having the capacity to", "designed to", "adapted to", "made to", or "capable of", depending on the context. The term "configured to" does not necessarily mean only that which is "specifically designed to" in terms of hardware. Instead, in some contexts, the expression "a device configured to" may mean that the device is "capable of" doing something together with other devices or components. For example, the phrase "a processor configured (or set) to perform A, B, and C" can mean a dedicated processor (e.g., an embedded processor) for performing those operations, or a generic-purpose processor (e.g., a CPU or an application processor (AP)) that can perform those operations by executing one or more software programs stored in a memory device.

The terms used in the present invention are only used to describe specific embodiments and may not be intended to limit the scope of other embodiments. The singular expression may include the plural expression unless the context clearly indicates otherwise. The terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person having ordinary skill in the art described in the present invention. Among the terms used in the present invention, terms defined in general dictionaries may be interpreted as having the same or similar meaning as the meaning they have in the context of the related art, and shall not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention. In some cases, even if a term is defined in the present invention, it cannot be interpreted to exclude embodiments of the present invention.

Hyperspectral optics can acquire continuous wavelengths that are dispersed, and can measure spectral characteristics through the acquired data. In the case of hyperspectral optics, Dyson method, Czerny-turner method, and Offner method, which have simple structures and excellent optical performance, are mainly used.

An embodiment of the present invention relates to an optical element used for assembling and aligning a reflective hyperspectral optical system (Czerny-Turner method, Offner method) using a spectroscopic element. The Czerny-Turner method is a method that uses a reflective diffraction grating. Light from a light source passes through a slit, is reflected by a curved mirror, and is converted into parallel light, and the parallel light is incident on a reflective diffraction grating. The reflective diffraction grating disperses light by wavelength, and the dispersed light is reflected by the curved mirror to form a focus on a detector, and a spectrum is detected. The Offner method, similar to the Czerny-Turner method, is composed of a curved mirror and a reflective diffraction grating.

By using an optical element according to an embodiment of the present invention, it is possible to confirm the exact mounting position of a spectroscopic element. This allows for reducing variables related to assembly and alignment, and can be used for the purpose of fine assembly and alignment of a hyperspectral optical system.

A hyperspectral optical system according to an embodiment of the present invention must rotate the mechanical axis of a spectroscopic element as a method for improving spectroscopic performance by optical characteristics.

This means that the position where the spectroscopic element is mounted is located in a three-dimensional arbitrary space. In order to align this, the positions of the light sources of multiple orders of dispersion and the positions of each field of view must be confirmed, and when the optical element of the present invention is used, the spectroscopic element can be precisely positioned.

In addition, in the case of conventional technology, since the optical system is aligned individually and then integrated, there are limitations in size. If an optical element for alignment is utilized, it can be integrated and aligned at once, so it can be used for the purpose of miniaturizing the size of the hyperspectral optical system equipment.

FIG. 1 is an exemplary diagram of an alignment optical element according to an embodiment of the present invention.

The alignment optical element according to an embodiment of the present invention is manufactured in a form in which it is coated on a transparent glass substrate. The size of the alignment optical element is determined according to the detector position and size, and the field of view of the optical system. In the case of an area with a transmittance of 80% or more, it is determined according to the position of the diffraction order and the field of view of the optical system, and in the case of the remaining area excluding this part, the coating is performed so that the transmittance is 10 to 30%. In order to confirm the position of each order, the area with a transmittance of 80% or more is set.

The tilt of the spectral element is aligned by the user. The tilt alignment of the spectral element is performed by the user using a hexapod (a precision-moving device). After setting a three-dimensional reference coordinate that takes into account the device mounting tolerance, the alignment is performed by controlling with high precision (0.001 mm, 0.001 degree). During the alignment, the position of the light source dispersed by the alignment optical element is checked and the alignment is performed.

As shown in reference number 110 of Fig. 1, when there is a light source (red circle) dispersed at the 0th position, it can be defined as a state in which the slope is not aligned or is not tilted compared to the reference plane.

However, when the slope of the spectral element is aligned, as in reference number 120 of Fig. 1, when the light source (red circle) is tilted upward, the slope of the spectral element can be defined as aligned.

The area of the spectral position of the detection surface has a transmittance of 80% or more, as shown in Fig. 1.

The area excluding the spectral position of the detection surface has a transmittance of 10 to 30%, as shown in Fig. 1.

An embodiment of the present invention is used for assembling and aligning a reflective hyperspectral optical system (Czerny-turner method, Offner method) using a spectroscopic element. The spectroscopic element has an incline to improve the performance of the optical system. For this reason, if it is not aligned at an accurate position, the optical performance deteriorates.

FIG. 2 is an exemplary diagram showing a case where an aligned optical element is mounted on the detection surface of a reflective hyperspectral optical system according to an embodiment of the present invention.

A device for aligning a spectroscopic element using an optical element according to an embodiment of the present invention of FIG. 2 may be configured to include a laser (210), a primary mirror (220), a spectroscopic element (230), an optical element (240), a spectroscopic element aligner, etc.

The laser (210) emits laser light to the primary mirror.

The primary mirror (220) reflects the laser (210) to a spectroscopic element (230) and reflects a plurality of lasers emitted from the spectroscopic element (230) to an optical element.

The spectrophotometer (230) spectra the reflected laser and emits it to the primary mirror (220).

The optical element (240) displays the transmission positions corresponding to the reflected lasers, as shown in Fig. 1.

The spectral element aligner adjusts the angle of the spectral element based on the above-described transmission positions.

As shown in Fig. 2, the alignment optical element is mounted on the detection surface (240) of the reflective hyperspectral optical system. The alignment optical element is coated on a glass substrate.

After a reference laser is incident on the primary mirror (220) so that it is aligned with the optical axis of the optical system, the position of the light source reflected by the spectroscopic element (230) and dispersed is checked through the 90% transmittance area of the alignment optical element. The 30% transmittance area is used to check when the position of the spectroscopic element (230) is not correct.

The area of the spectral position of the detection surface has a transmittance of 80% or more.

The area excluding the spectral position of the detection surface has a transmittance of 10 to 30%.

The alignment optical element is composed of a coating having a positional tolerance within the optical system assembly/alignment allowable tolerance range.

FIG. 3 is a cross-sectional view of a detector of an aligned optical element mounted on a detection surface of a reflective hyperspectral optical system according to an embodiment of the present invention.

Through the cross-sectional view of Fig. 3, the position, size, spacing, etc. of the detector of the optical element (310) can be known. The numbers described in Fig. 3 are an example and are not limited thereto.

FIG. 4 is a drawing showing an application photograph of an optical element for alignment according to an embodiment of the present invention.

Reference numeral 410 in Fig. 4 is the same as the alignment optical element in Fig. 1. The alignment optical element in Fig. 4 is in the form of a coating on a transparent glass substrate.

310 in Fig. 3 and 410 in Fig. 4 are the same.

FIG. 5 is a flowchart illustrating a method for aligning a spectroscopic element using an optical element according to an embodiment of the present invention.

The laser device emits a laser beam from the primary mirror at step 501.

At step 503 in the above-mentioned main mirror, the laser is reflected onto the spectrophotometer.

In step 505 of the above-described spectroscopic element, the reflected laser is spectroscopically divided and emitted to the primary mirror.

In the above main mirror, at step 507, a plurality of lasers emitted from the above spectroscopic element are reflected by an optical element.

In the above optical element, the transmission positions corresponding to the reflected lasers are indicated at step 509.

In step 511 of the spectroscopic element alignment device, the angle of the spectroscopic element is adjusted based on the above-mentioned transmission positions.

When indicating the transmission positions corresponding to the reflected lasers, the area of the spectral position of the optical element is coated to have a transmittance of 80% or more.

In addition, when indicating the transmission positions corresponding to the reflected lasers, the area excluding the spectral position of the optical element is coated to have a transmittance of 10 to 30%.

An alignment optical element according to an embodiment of the present invention is used for the purpose of assembling and aligning a reflective hyperspectral optical system, and through this, the position of the spectral element can be optimized and assembly and alignment variables can be reduced, thereby enabling easy assembly and alignment.

In addition, an embodiment of the present invention can perform integrated alignment by utilizing an alignment optical element, thereby simplifying the assembly/alignment procedure and enabling the design of an integrated optical system.

The above-described contents can be modified and changed by those skilled in the art in which the present invention belongs, without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention are not intended to limit the technical idea but to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the rights of the present invention.

Claims (6)

A laser device that emits a laser beam as a primary beam;
The primary mirror reflects the laser to a spectroscopic element and reflects a plurality of lasers emitted from the spectroscopic element to an optical element;
The above-mentioned spectroscopic element which spectroscopically divides the reflected laser and radiates it to the primary mirror;
The optical element indicating the transmission positions corresponding to the lasers reflected through the above spectroscopic element; and
A spectral element aligner for adjusting the angle of the spectral element based on the above-mentioned transmission positions is included.
The area of the spectral position of the above optical element is coated to have a transmittance of 80% or more,
The area excluding the spectral position of the above optical element is coated to have a transmittance of 10 to 30%,
A device for aligning a spectral element using an optical element, wherein the region of the spectral position of the optical element includes five orders indicating the transmission positions, and among the five orders, the +2nd order, the +1st order, the -1st order, and the +2nd order each consist of three circles, and among the five orders, the 0th order consists of three ellipses, and the 0th order aligns the inclination of the spectral element.
delete In the first paragraph,
The tilt alignment of the above spectral elements is achieved through a hexapod.
A device for aligning a spectroscopic element using an optical element, wherein the tilt alignment of the above spectroscopic element is performed by controlling with high precision (0.001 mm, 0.001 degree) after setting a three-dimensional reference coordinate that takes into account the mounting tolerance of the apparatus.
In a laser device, the process of emitting a laser toward a primary mirror;
In the above main mirror, the process of reflecting the laser onto a spectroscopic element;
In the above spectroscopic element, the process of spectroscopically emitting the reflected laser and emitting it to the primary mirror;
In the above main mirror, a process of reflecting a plurality of lasers emitted from the spectroscopic element onto an optical element;
In the above optical element, a process of displaying transmission positions corresponding to lasers reflected through the spectroscopic element; and
In a spectral element alignment device, a process of adjusting the angle of the spectral element based on the transmission positions is included.
The area of the spectral position of the above optical element is coated to have a transmittance of 80% or more,
The area excluding the spectral position of the above optical element is coated to have a transmittance of 10 to 30%,
A method for aligning a spectral element using an optical element, wherein the region of the spectral position of the optical element includes five orders indicating the transmission positions, and among the five orders, the +2nd order, the +1st order, the -1st order, and the +2nd order each consist of three circles, and among the five orders, the 0th order consists of three ellipses, and the 0th order aligns the inclination of the spectral element.
delete In paragraph 4,
The tilt alignment of the above spectral elements is achieved through a hexapod.
A method of aligning a spectroscopic element using an optical element, wherein the tilt alignment of the above spectroscopic element is performed by setting a three-dimensional reference coordinate that takes into account the mechanical mounting tolerance, and then controlling it with high precision (0.001 mm, 0.001 degree).

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