CN115541016A - Monochromator - Google Patents

Abstract

The invention discloses a monochromator, which comprises a composite light source, an optical fiber coupler, a spectrum confocal measuring head and a movable reflecting unit, wherein the optical fiber coupler is arranged on the composite light source; the optical fiber coupler is used for transmitting the composite light emitted by the composite light source to the spectrum confocal measuring head; the spectrum confocal measuring head is used for dispersing light focuses with different wavelengths in the composite light at different positions of an optical axis; the movable reflection unit is arranged at the light focus and used for reflecting monochromatic light with corresponding wavelength at the light focus to the optical fiber coupler for output. The monochromator is based on a spectrum confocal principle, and disperses light focuses with different wavelengths in composite light at different positions of an optical axis by using a spectrum confocal measuring head, and then reflects monochromatic light with corresponding wavelengths at the light focuses to an optical fiber coupler for output by using a movable reflection unit. Compared with a monochromator for splitting light by using an adjusting grating, the monochromator has the advantages of simple structure, easiness in processing and debugging, capability of outputting a spectrum quickly and accurately and easiness in maintenance.

Description

Monochromatic instrument

Technical Field

The invention discloses a monochromator, and belongs to the technical field of spectral instruments.

Background

Monochromators are devices used to study and analyze substance spectra, and are currently widely used in various fields such as military, industry, agriculture, medical care, and scientific research. Among them, monochromators, which can control spectral output, are the most common measuring instruments.

In the prior art, a monochromator splits light by adjusting a grating, and then outputs a specific spectrum. The monochromator using the grating has a complex structure, is difficult to process and debug and is difficult to maintain.

Disclosure of Invention

An object of the application is to provide a monochromator, especially a monochromator based on spectrum confocal to solve the technical problems that the monochromator in the prior art is more complicated in structure, large in processing and debugging difficulty and not easy to maintain.

The invention provides a monochrometer in a first aspect, which comprises a composite light source, an optical fiber coupler, a spectrum confocal measuring head and a movable reflecting unit;

the optical fiber coupler is used for transmitting the composite light emitted by the composite light source to the spectrum confocal measuring head;

the spectrum confocal measuring head is used for dispersing light focuses with different wavelengths in the composite light at different positions of an optical axis;

the movable reflection unit is arranged at the light focus and used for reflecting monochromatic light with the corresponding wavelength at the light focus to the optical fiber coupler for output.

Preferably, the movable reflection unit includes a linear movement mechanism and a reflection mirror assembly provided on the linear movement mechanism;

the reflector assembly is arranged at the light focus and used for reflecting monochromatic light with the corresponding wavelength at the light focus to the optical fiber coupler for outputting;

the linear motion mechanism is used for driving the reflector component to do linear motion along the optical axis of the composite light.

Preferably, the linear motion mechanism comprises a mounting seat, a motor, a linear slide rail and a sliding table arranged on the linear slide rail;

the linear slide rail extends along the optical axis direction of the composite light, and is arranged on the mounting seat;

the motor is fixedly arranged on the mounting seat, and an output shaft of the motor is connected with the sliding table and used for driving the sliding table to slide on the linear sliding rail;

the reflector assembly is arranged on the sliding table.

Preferably, the linear motion mechanism further comprises a scale grating and a grating reading head matched with the scale grating;

the scale grating is arranged on the side wall of the linear sliding rail;

the grating reading head is arranged on the mounting seat.

Preferably, the mirror assembly comprises a support and a mirror disposed on the support;

the support is fixedly arranged on the sliding table.

Preferably, an electrical controller is also included;

and the electric controller is connected with the motor and the grating reading head and is used for controlling the motor according to the reading of the grating reading head.

Preferably, the electrical controller is further connected to the composite light source for adjusting the luminous intensity of the composite light source.

Preferably, the device further comprises a bottom plate;

the composite light source, the optical fiber coupler, the spectrum confocal measuring head and the movable reflection unit are all fixedly arranged on the bottom plate;

the optical fiber coupler is a Y-shaped optical fiber coupler.

Compared with the prior art, the monochromator provided by the invention has the following beneficial effects:

the monochromator is based on a spectrum confocal principle, and disperses light focuses with different wavelengths in composite light at different positions of an optical axis by using a spectrum confocal measuring head, and then reflects monochromatic light with corresponding wavelengths at the light focuses to an optical fiber coupler for output by using a movable reflection unit. Compared with a monochromator for splitting light by using an adjusting grating, the spectrometer has the advantages of simple structure, easiness in processing and debugging, capability of outputting a spectrum quickly and accurately and easiness in maintenance.

Drawings

FIG. 1 is a schematic perspective view of a monochromator according to an embodiment of the present invention;

FIG. 2 is a top view of a monochromator according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a linear motion mechanism in an embodiment of the present invention.

FIG. 1 shows a base plate; 2 is a composite light source; 3 is an optical fiber coupler; 4 is a measuring head support; 5, a spectrum confocal measuring head; 6 is a reflector; 7 is a support; 8 is a linear motion mechanism; 9 is an electric controller; 10 is a sliding table; 11 is a motor; 12 is a linear slide rail; 13 is a scale grating; 14 is a grating reading head; and 15 is a mounting seat.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

As shown in fig. 1, the monochromator according to the embodiment of the present invention includes a composite light source 2, an optical fiber coupler 3, a spectral confocal measuring head 5, and a movable reflection unit;

the optical fiber coupler 3 is used for transmitting the composite light emitted by the composite light source 2 to the spectrum confocal measuring head 5;

the spectrum confocal measuring head 5 is used for dispersing light focuses with different wavelengths in the composite light at different positions of an optical axis;

the movable reflection unit is arranged at the light focus and used for reflecting monochromatic light with corresponding wavelength at the light focus to the optical fiber coupler 3 for output. The distance between the movable reflection unit and the spectrum confocal measuring head 5 can be adjusted.

The monochromator is based on a spectrum confocal principle, and disperses light focuses with different wavelengths in composite light at different positions of an optical axis by using a spectrum confocal measuring head, and then reflects monochromatic light with corresponding wavelengths at the light focuses to an optical fiber coupler for output by using a movable reflection unit. Compared with a monochromator for splitting light by using an adjusting grating, the spectrometer has the advantages of simple structure, easiness in processing and debugging, capability of outputting a spectrum quickly and accurately and easiness in maintenance.

The principle of spectrum confocal is that a compound light source emits a beam of compound light with a wide spectrum, after dispersion, light focuses with different wavelengths are dispersed at different positions of an optical axis, and the purpose is to establish the corresponding relation between the distance and the wavelength. The measured light is emitted to the surface of an object and is reflected back, the light intensity is sensed to be the maximum by the spectrometer after passing through the small hole only if the monochromatic light meeting the confocal condition, and the reflection position can be restored by processing an emergent signal detected by the spectrometer and extracting the peak wavelength of the emergent signal. When the measured object moves up and down, the displacement of the measured object can be obtained by measuring the wavelength of the reflected light.

In order to ensure that the monochromator of the present invention can output an accurate spectrum, the movable reflection unit of the embodiment of the present invention includes a linear motion mechanism 8 and a mirror assembly provided on the linear motion mechanism 8;

the reflector component is arranged at the light focus and used for reflecting monochromatic light with corresponding wavelength at the light focus to the optical fiber coupler 3 for outputting;

the linear motion mechanism 8 is used for driving the reflector component to do linear motion along the optical axis of the compound light.

The invention adopts a mechanical structure to drive the reflector component to do linear motion, and can ensure that the monochromator can output accurate spectrum.

Further, the linear motion mechanism 8 of the embodiment of the present invention includes a mounting seat 15, a motor 11, a linear slide rail 12, and a sliding table 10 disposed on the linear slide rail 12;

the linear slide rail 12 extends along the optical axis direction of the compound light, and the linear slide rail 12 is arranged on the mounting seat 15;

the motor 11 is fixedly arranged on the mounting seat 15, and an output shaft of the motor 11 is connected with the sliding table 10 and used for driving the sliding table 10 to slide on the linear sliding rail 12;

the mirror assembly is disposed on the slide table 10.

The reflector assembly comprises a support 7 and a reflector 6 arranged on the support 7; the support 7 is fixedly arranged on the sliding table 10, and the reflector 6 is a plane reflector.

In order to ensure the adjustment precision of the motor 11, the linear motion mechanism 8 of the embodiment of the invention further comprises a scale grating 13 and a grating reading head 14 matched with the scale grating 13;

wherein the scale grating 13 is arranged on the side wall of the linear slide rail 12;

the grating reader 14 is disposed on the mounting base 15.

Further, the monochromator of the embodiment of the present invention further includes an electrical controller 9;

the electric controller 9 is connected with the motor 11 and the grating reading head 14 and is used for controlling the motor 11 according to data of the grating reading head 14, so that the output of the motor 11 is accurately controlled.

The electrical controller 9 in the embodiment of the present invention is further connected to the composite light source 2, and is configured to adjust the light emitting intensity of the composite light source 2 to ensure the intensity of the output spectrum.

In order to make the structure of the monochromator of the embodiment of the invention compact, the monochromator of the embodiment of the invention also comprises a bottom plate 1;

the composite light source 2, the optical fiber coupler 3, the spectrum confocal measuring head 5 and the movable reflection unit are fixedly arranged on the bottom plate 1; the optical fiber coupler 3 is a Y-shaped optical fiber coupler 3, one end of the Y-shaped optical fiber coupler 3 is connected with the composite light source 2, one end outputs monochromatic light, and the other end is connected with the spectrum confocal measuring head 5. The Y-shaped optical fiber coupler 3 can realize the change of the optical path, so that the structure of the monochromator is compact.

The spectral confocal measuring head 5 in the embodiment of the invention is arranged on the bottom plate 1 through the measuring head support 4.

The working principle of the monochromator of the embodiment of the invention is as follows:

1. the composite light source 2 enters a spectrum confocal measuring head 5 through an optical fiber coupler 3 to generate spectrum dispersion, and light focuses with different wavelengths are dispersed at different positions of an optical axis;

2. the light with the focal point on the plane mirror 6 is reflected back into the fiber coupler 3;

3. one end of the optical fiber coupler 3 outputs monochromatic light;

4. calibrating spectral peak values corresponding to different positions by using a spectrometer, and finding out a one-to-one correspondence relationship; after calibration is completed, monochromatic light with any number of wavelengths in the range can be output by controlling the position of the reflector 6 through the linear motion mechanism 8.

The monochromator has simple structure and easy processing and debugging, thereby being capable of outputting the spectrum quickly and accurately and being easy to maintain.

Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.

Claims (8)

1. A monochromator is characterized by comprising a composite light source, an optical fiber coupler, a spectrum confocal measuring head and a movable reflecting unit;

the optical fiber coupler is used for transmitting the composite light emitted by the composite light source to the spectrum confocal measuring head;

the spectrum confocal measuring head is used for dispersing light focuses with different wavelengths in the composite light at different positions of an optical axis;

the movable reflection unit is arranged at the light focus and used for reflecting monochromatic light with the corresponding wavelength at the light focus to the optical fiber coupler for output.

2. The monochromator of claim 1, wherein the moveable reflective unit comprises a linear motion mechanism and a mirror assembly disposed on the linear motion mechanism;

the reflector assembly is arranged at the light focus and used for reflecting monochromatic light with the corresponding wavelength at the light focus to the optical fiber coupler for outputting;

the linear motion mechanism is used for driving the reflector component to do linear motion along the optical axis of the compound light.

3. The monochromator of claim 2, wherein the linear motion mechanism comprises a mounting base, a motor, a linear slide rail and a sliding table arranged on the linear slide rail;

the linear slide rail extends along the optical axis direction of the compound light, and is arranged on the mounting seat;

the motor is fixedly arranged on the mounting seat, and an output shaft of the motor is connected with the sliding table and used for driving the sliding table to slide on the linear sliding rail;

the reflector assembly is arranged on the sliding table.

4. The monochromator of claim 3, wherein the linear motion mechanism further comprises a scale grating and a grating readhead cooperating with the scale grating;

the scale grating is arranged on the side wall of the linear slide rail;

the grating reading head is arranged on the mounting seat.

5. The monochromator of claim 3, wherein the mirror assembly comprises a mount and a mirror disposed on the mount;

the support is fixedly arranged on the sliding table.

6. The monochromator of claim 3, further comprising an electrical controller;

and the electric controller is connected with the motor and the grating reading head and is used for controlling the motor according to the reading of the grating reading head.

7. The monochromator of claim 6, wherein the electrical controller is further connected to the composite light source for adjusting the luminous intensity of the composite light source.

8. The monochromator of claim 1, further comprising a base plate;

the composite light source, the optical fiber coupler, the spectrum confocal measuring head and the movable reflection unit are all fixedly arranged on the bottom plate;

the optical fiber coupler is a Y-shaped optical fiber coupler.

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