CN116678497A - Automatic calibration device and method for spectrometer - Google Patents
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Abstract
The invention discloses an automatic calibration device and method of a spectrometer, which relate to the technical field of spectrometers and comprise the following steps: after the light beam is incident to the collimator, controlling the action of the incident angle rotating motor according to the appointed incident angle, so that the light beam is incident to the grating from the collimator at the appointed incident angle; the action of the grating rotating motor is controlled to enable the grating to split the incident light beam; controlling the action of the emergent angle rotating motor according to the specified emergent angle, enabling the split light beam to enter the imager at the specified emergent angle, and obtaining a light source spectrum at the specified imaging distance; and comparing the light source spectrum with the calibration spectrum, and controlling the action of the driver in a feedback mode according to the comparison result. The adjustment accuracy is improved, the human intervention is reduced, and the automatic calibration is realized.
Description
Technical Field
The invention relates to the technical field of spectrometers, in particular to an automatic calibration device and method for a spectrometer.
Background
The spectrometer is an instrument for measuring the spectral distribution of light, and is widely applied to the fields of optical research, spectral analysis, astronomy, optical fiber communication, spectral imaging, spectral medicine, spectral sensing, material analysis, environmental monitoring, food safety, drug research and development and the like. By measuring the spectrum of light absorbed, emitted or scattered by the sample, the composition, structure and property information of the sample can be obtained; can help to understand the nature of light in depth and study the mechanism of interaction of light and substances; by analyzing the spectrum of the star, the information of the composition, the temperature, the speed, the distance and the like of the star can be determined; the spectrum analysis can be carried out on the optical signal, so that the performance and the reliability of the optical fiber communication system can be optimized; the spectrometer can be combined with an imaging technology to perform spectral imaging, namely, complete spectral information is acquired on each pixel point, and early cancer detection, hemoglobin concentration measurement and the like can be realized by measuring spectral characteristics in tissues or blood.
To ensure accuracy and reliability of the spectrometer, it is necessary to conduct calibration tests periodically. The traditional spectrometer calibration test generally needs manual intervention, consumes a great deal of time and energy, is easy to influence by the technical level of operators, requires complex operation flow and professional knowledge, has high requirements on users, and operators need to have sufficient training and experience to perform calibration correctly.
Furthermore, the performance of spectrometers drift over time and with changing conditions of use, and conventional calibration methods often fail to track and correct such drift in real time, resulting in instability and inaccuracy of the calibration results.
In summary, the existing spectrometer calibration method has the disadvantages of high complexity, high time and labor cost, variability problem, insufficient flexibility and adaptability, and the like.
Disclosure of Invention
In order to solve the problems, the invention provides an automatic calibration device and an automatic calibration method for a spectrometer, which are used for determining an incident angle and an emergent angle through a specified wavelength range and converting the adjusted angle into a movement distance of a motor, so that the adjustment accuracy is improved, the human intervention is reduced, and the automatic calibration is realized.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides an automatic calibration device for a spectrometer, comprising: the device comprises a light emitter, a collimator, an incident angle rotating platform, a grating rotating seat, an emergent angle rotating platform, an imager, a driver and a controller;
the illuminator is used for generating a light beam with a specified wavelength range and is incident to the collimator;
the collimator is connected with the incident angle rotating platform, and the incident angle rotating platform is driven by the driver to rotate so that the light beam is incident to the grating from the collimator at a specified incident angle;
the grating is arranged on the grating rotating seat, and the grating rotating seat is driven by the driver to rotate so as to split an incident light beam;
the emergent angle rotating platform is connected with the incident angle rotating platform, and the emergent angle rotating platform rotates under the drive of the driver, so that the split light beam is incident to the imager at a specified emergent angle;
the imager is used for receiving the emergent light beam at a specified imaging distance and imaging;
the controller is connected with the imager and is used for comparing the light source spectrum obtained after imaging with the calibration spectrum and controlling the action of the driver in a feedback mode according to the comparison result.
As an alternative embodiment, the light emitter includes a light source, a diaphragm, an optical fiber, and a wavelength division multiplexer; the light beam emitted by the light source enters the optical fiber through the fan-shaped light passing area on the diaphragm, and the light entering the optical fiber enters the collimator through the wavelength division multiplexer.
As an alternative implementation mode, the collimator is fixedly connected to the incident angle rotating platform through the collimator fixing frame, the incident angle rotating platform is not contacted with the grating rotating seat, the incident angle rotating platform is connected with the emergent angle rotating platform through the fixing rod, the emergent angle rotating platform drives the incident angle rotating platform to rotate together, but the collimator cannot rotate along with the emergent angle rotating platform, and the incident angle rotating platform can only drive the collimator to rotate through the collimator fixing frame.
As an alternative embodiment, the specified angle of incidence is derived from a specified wavelength range, the specified angle of incidence being the angle of incidence of the center wavelength, in particular: obtaining a central wavelength according to the maximum wavelength and the minimum wavelength in the specified wavelength range, wherein the incident angle of the central wavelength is equal to the exit angle of the central wavelength; thereby, the incidence angle of the center wavelength is obtained by the center wavelength and the grating constant：/>The method comprises the steps of carrying out a first treatment on the surface of the Wherein d is a grating constant, m is a diffraction order, < ->Is the center wavelength.
Alternatively, the specified exit angle is obtained from a specified wavelength rangeSpecifically:
wherein ,emergence angle for maximum wavelength, +.>An exit angle of the minimum wavelength, d is a grating constant, m is a diffraction order, +.>Maximum wavelength, +.>Is the minimum wavelength, +.>To specify the angle of incidence.
As an alternative embodiment, the driver includes an incident angle rotating motor for driving the incident angle rotating platform to rotate, an exiting angle rotating motor for driving the exiting angle rotating platform to rotate, and a grating rotating motor for driving the grating rotating seat to rotate.
Alternatively, the distance of movement of the incident angle rotating electrical machine is obtained from a specified incident angleRotating electrical machine by controlling incident angle according to +.>Performing actions so as to drive the incident angle rotating platform to rotate;
wherein the incident angle is the movement distance of the rotating motorThe method comprises the following steps: />，/>To specify the angle of incidence +.>The radius of rotation of the platform is rotated for the angle of incidence.
Alternatively, the exit angle is obtained from a specified exit angleDistance of movement of the angular-outgoing rotating electrical machineBy controlling the emergence angle the rotating electrical machine is according to +.>Performing actions so as to drive the emergent angle rotating platform to rotate;
wherein the movement distance of the emergence angle rotating motorThe method comprises the following steps: />；/>For the specified emergence angle->The radius of rotation of the platform is rotated for the exit angle.
As an alternative embodiment, the imager includes a focusing lens, a focusing lens holder, an X-axis displacement stage, an X-axis displacement motor, a detector rotation stage, an XYZ-axis displacement stage, an X-axis motor, a Y-axis motor, and a Z-axis motor;
the focusing lens is used for receiving the split light beam which is incident at the specified exit angle, and is fixed on the X-axis displacement platform through the focusing lens fixing frame, and the X-axis displacement platform moves under the drive of the X-axis displacement motor;
the detector is arranged on the detector rotating platform and is driven by the detector rotating platform to rotate; the detector rotating platform is arranged on the XYZ-axis displacement platform, and the detector is driven by the X-axis motor, the Y-axis motor and the Z-axis motor to move along the X-axis, the Y-axis or the Z-axis by the detector rotating platform;
thereby adjusting the distance between the focusing lens and the detector to image on the detector and obtain the light source spectrum.
Alternatively, the adjusting the distance between the focusing lens and the detector may include:
according to the specified wavelengthEmergence angle of maximum wavelength->Emergence angle of minimum wavelength->And focusing lens focal length +.>Obtaining the length of the imaging detector camera pixel>：
Length of camera pixel of imaging detectorAnd the actual detector camera element length +.>And (3) making the difference:
wherein ,is the difference;
to be used forThe minimum is to adjust the focus lens focal length for the adjustment target, and the final imaging detector camera pixel length is determined according to the final determined focus lens focal length, so as to adjust the positions of the focus lens and the detector.
Alternatively, the process of comparing the light source spectrum with the calibration spectrum includes: if the light source spectrum and the light with the same wavelength in the calibration spectrum appear on the same pixel of the detector, the light source spectrum and the light with the same wavelength in the calibration spectrum are consistent, and the spectrometer has no offset error; otherwise, the spectrometer is inconsistent, and when the drift error exceeds the error allowable range, judging whether the driver moves to a specified distance, and continuing to adjust and calibrate until the drift error meets the error allowable range.
In a second aspect, the present invention provides a method for automatically calibrating a spectrometer, using the device for automatically calibrating a spectrometer according to the first aspect, comprising:
after the generated light beam is incident to the collimator, the movement distance of the incident angle rotating motor is obtained according to the appointed incident angle, so that the incident angle rotating platform is driven to rotate by controlling the action of the incident angle rotating motor, and the light beam is incident to the grating from the collimator at the appointed incident angle;
the grating rotating seat is driven to rotate by controlling the action of the grating rotating motor, so that the grating splits the incident light beam;
obtaining the movement distance of the emergent angle rotating motor according to the appointed emergent angle, so that the emergent angle rotating platform is driven to rotate by controlling the action of the emergent angle rotating motor, the split light beam is made to enter the imager at the appointed emergent angle, and the light source spectrum is obtained at the appointed imaging distance;
and comparing the light source spectrum with the calibration spectrum, and controlling the action of the driver in a feedback mode according to the comparison result.
Compared with the prior art, the invention has the beneficial effects that:
conventional spectrometer calibration methods require calibration of parameters of the light source, such as wavelength, intensity and position, and related parameters of the spectrometer to achieve accurate calibration. The invention is different from other calibration methods requiring complex operation, the incidence angle and the emergence angle are determined by the appointed wavelength, and then the adjusted angle is converted into the movement distance of the motor, thereby improving the adjustment accuracy, reducing the human intervention and realizing the automatic calibration.
Because the performance of the spectrometer drifts with time and use conditions, conventional calibration methods cannot track and correct drift in real time, resulting in instability and inaccuracy of the calibration results. According to the invention, the drift of the spectrometer is judged through the feedback of the motor, the drift and the deviation of the spectrometer are monitored in real time, and the adjustment is automatically carried out after the drift exceeds the error allowable range, so that the spectrometer is ensured to be in an optimal working state at all times.
The invention provides an automatic calibration device and method for a spectrometer, which realize a rapid and continuous calibration process, monitor drift and deviation of the spectrometer in real time, correct the spectrometer according to a preset standard, and maintain stability and accuracy of the spectrometer and improve long-term stability through real-time tracking and correction.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a front view of an automatic calibration device for a spectrometer according to embodiment 1 of the present invention;
FIG. 2 is a perspective view of an automatic calibration device for a spectrometer according to embodiment 1 of the present invention;
fig. 3 is a schematic view of an aperture stop provided in embodiment 1 of the present invention;
fig. 4 is a schematic diagram showing the movement distance of the incident angle rotating electrical machine according to embodiment 1 of the present invention;
fig. 5 is a schematic diagram of a movement distance of an exit angle rotating motor according to embodiment 1 of the present invention;
FIG. 6 is a schematic diagram of the distance between the focusing lens and the grating and the detector according to embodiment 1 of the present invention;
wherein, 1, collimator, 2, collimator fixing frame, 3, incidence angle rotating motor, 4, incidence angle rotating platform, 5, grating rotating motor, 6, focusing lens, 7, focusing lens fixing frame, 8, CCD detector, 9, detector rotating platform, 10, Z axis motor, 11, X axis motor, 12, an XYZ axis displacement platform, 13, a Y axis motor, 14, an X axis displacement motor, 15, an X axis displacement platform, 16, an emergence angle rotating motor, 17, an emergence angle rotating platform, 18, a grating rotating seat, 19, a fixed rod, 20, a diaphragm, 21, a control motor, 22, a wavelength division multiplexer, 23 and a grating.
Detailed Description
The invention is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms also are intended to include the plural forms, and furthermore, it is to be understood that the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions, such as, for example, processes, methods, systems, products or devices that comprise a series of steps or units, are not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or inherent to such processes, methods, products or devices.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1
The embodiment provides an automatic calibration device for a spectrometer, comprising: the device comprises a light emitter, a collimator, an incident angle rotating platform, a grating rotating seat, an emergent angle rotating platform, an imager, a driver and a controller;
the illuminator is used for generating a light beam with a specified wavelength range and is incident to the collimator;
the collimator is connected with the incident angle rotating platform, and the incident angle rotating platform is driven by the driver to rotate so that the light beam is incident to the grating from the collimator at a specified incident angle;
the grating is arranged on the grating rotating seat, and the grating rotating seat is driven by the driver to rotate so as to split an incident light beam;
the emergent angle rotating platform is connected with the incident angle rotating platform, and the emergent angle rotating platform rotates under the drive of the driver, so that the split light beam is incident to the imager at a specified emergent angle;
the imager is used for receiving the emergent light beam at a specified imaging distance and imaging;
the controller is connected with the imager and is used for comparing the light source spectrum obtained after imaging with the calibration spectrum and controlling the action of the driver in a feedback mode according to the comparison result.
As shown in fig. 1-2, in this embodiment, the light emitter includes a light source, a diaphragm 20, an optical fiber, a control motor 21, and a wavelength division multiplexer 22;
wherein the light source comprises a light source for a given wavelength range and a calibration light source for a calibration lamp, the light source being selected by controlling the motor 21;
as shown in fig. 3, the diaphragm 20 has the function of limiting the light beam to pass through, and the light beam emitted by the light source enters the optical fiber through the fan-shaped light passing area on the diaphragm 20; the light entering the optical fibers then passes through a wavelength division multiplexer 22, and after combining light from two different optical fibers into one beam, enters the collimator 1.
As an alternative embodiment, the collimator 1 is a reflective collimator.
In this embodiment, the collimator 1 is fixedly connected to the incident angle rotating platform 4 through the collimator fixing frame 2, the incident angle rotating platform 4 and the grating rotating seat 18 are not in contact with each other, the incident angle rotating platform 4 is connected to the exit angle rotating platform 17 through the fixing rod 19, the exit angle rotating platform 17 can drive the incident angle rotating platform 4 to rotate together, but the collimator 1 cannot rotate along with the exit angle rotating platform 17, and the incident angle rotating platform 4 can only drive the collimator 1 to rotate through the collimator fixing frame 2.
In this embodiment, the driver includes an incident angle rotating motor 3 for driving the incident angle rotating platform 4 to rotate, an exit angle rotating motor 16 for driving the exit angle rotating platform 17 to rotate, and a grating rotating motor 5 for driving the grating rotating base 18 to rotate.
In the present embodiment, after the light beam is incident on the collimator, the light beam is irradiated according to a specified wavelength range,/>]Obtain a specified incident angle->And specify the emergence angle->；
The specified incident angleIncident angle +.>Specifically:
wherein d is a grating constant; m is a diffraction order number, and takes + -1;n is the number of grating lines and is a specified fixed value;for the center wavelength +.>Maximum wavelength, +.>Is the minimum wavelength; />Is the exit angle of the center wavelength.
The specified emergence angleThe method comprises the following steps:
wherein ,emergence angle for maximum wavelength, +.>Is the exit angle of the smallest wavelength.
In this embodiment, after the light beam enters the grating 23 at a specified incident angle through the collimator 1, the grating rotating motor 5 drives the grating rotating seat 18 to rotate, so that the light beam passing through the grating is divided into light with different wavelengths.
As shown in FIG. 4, according to the specified incident angleObtaining the movement distance of the incident angle rotating motor>Rotating electrical machine by controlling incident angle according to +.>The action is carried out, so that the incident angle rotating platform is driven to rotate, and finally, the light beam is incident to the grating from the collimator at a specified incident angle;
specifically:
；
；
wherein ,is the angle of incidence of the light beam; />The radius of rotation of the platform is rotated for the angle of incidence.
As shown in FIG. 5, according to the specified exit angleObtain the movement distance of the emergence angle rotating motor>By controlling the emergence angle the rotating electrical machine is according to +.>The action is carried out, so that the emergent angle rotating platform is driven to rotate, and finally the split light beam is incident to the imager at a specified emergent angle;
specifically:
；
；
wherein ,an exit angle of the split light beam; />The radius of rotation of the platform is rotated for the exit angle.
In the present embodiment, the imager includes a focusing lens 6, a focusing lens holder 7, an X-axis displacement stage 15, an X-axis displacement motor 14, a CCD detector 8, a detector rotation stage 9, an XYZ-axis displacement stage 12, an X-axis motor 11, a Y-axis motor 13, and a Z-axis motor 10;
the focusing lens 6 is used for receiving the split light beam which is incident at a specified exit angle, the focusing lens 6 is fixed on the X-axis displacement platform 15 through the focusing lens fixing frame 7, and the X-axis displacement platform 15 is driven by the X-axis displacement motor 14 to move;
the CCD detector 8 is arranged on the detector rotating platform 9 and is driven by the detector rotating platform 9 to rotate;
the detector rotating platform 9 is arranged on the XYZ-axis displacement platform 12, and the CCD detector 8 is driven by the X-axis motor 11, the Y-axis motor 13 and the Z-axis motor 10 to move along the X-axis, the Y-axis or the Z-axis through the detector rotating platform 9;
the distance L between the focusing lens 6 and the CCD detector 8 is adjusted by the above structure imag Ensuring that the focusing lens 6 has the correct working distance and the correct imaging distance; as shown in FIG. 6, wherein L cf Is the distance between the focusing lens 6 and the grating; finally, imaging is performed on the CCD detector 8, thereby obtaining a light source spectrum.
In the present embodiment, the process of adjusting the distance between the focusing lens 6 and the CCD detector 8 includes:
according to the specified wavelengthEmergence angle of maximum wavelength->Emergence angle of minimum wavelength->And focusing lens focal length +.>Calculating to obtain the length of the imaging detector camera pixel>：
Then, for the length of the imaging detector camera pixelAnd the actual detector camera element length +.>And (3) making the difference:
wherein ,is the difference between the imaging detector camera pixel length and the actual detector camera pixel length;
to be used forMinimum as adjustment target, by adjusting focus lens focal length +.>To find the smallest +.>Finally, the optimal solution of the imaging target area is realized;
finally, according to the determined focal length of the focusing lensDetermining the final imaging detector camera pixel length +.>And (2) combination->The positions of the focusing lens 6 and the CCD detector 8 are adjusted.
In this embodiment, after spectral imaging of the light source in the given wavelength range is completed, the motor is controlled to close the diaphragm so as to block the light from the light source, and simultaneously the motor is controlled to open the other diaphragm so as to select the calibration light beam incident on the calibration light source, and the calibration spectrum of the calibration light source is obtained by detection of the CCD detector.
Comparing the light source spectrum with the calibration spectrum, if the light with the same wavelength in the light source spectrum and the calibration spectrum appears on the same pixel of the CCD detector (error allows + -2 pixels), the light source spectrum and the calibration spectrum are consistent, and the spectrometer has no offset error; otherwise, the spectrometer is inconsistent, and when the drift error exceeds the error allowable range, judging whether the driver moves to a specified distance, and continuing to adjust and calibrate until the drift error meets the error allowable range.
Example 2
The present embodiment provides an automatic calibration method for a spectrometer, which adopts the automatic calibration device for a spectrometer described in embodiment 1, and includes:
after the generated light beam is incident to the collimator, the movement distance of the incident angle rotating motor is obtained according to the appointed incident angle, so that the incident angle rotating platform is driven to rotate by controlling the action of the incident angle rotating motor, and the light beam is incident to the grating from the collimator at the appointed incident angle;
the grating rotating seat is driven to rotate by controlling the action of the grating rotating motor, so that the grating splits the incident light beam;
obtaining the movement distance of the emergent angle rotating motor according to the appointed emergent angle, so that the emergent angle rotating platform is driven to rotate by controlling the action of the emergent angle rotating motor, the split light beam is made to enter the imager at the appointed emergent angle, and the light source spectrum is obtained at the appointed imaging distance;
and comparing the light source spectrum with the calibration spectrum, and controlling the action of the driver in a feedback mode according to the comparison result.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (10)
1. An automatic calibration device for a spectrometer, comprising: the device comprises a light emitter, a collimator, an incident angle rotating platform, a grating rotating seat, an emergent angle rotating platform, an imager, a driver and a controller;
the illuminator is used for generating a light beam with a specified wavelength range and is incident to the collimator;
the collimator is connected with the incident angle rotating platform, and the incident angle rotating platform is driven by the driver to rotate so that the light beam is incident to the grating from the collimator at a specified incident angle;
the grating is arranged on the grating rotating seat, and the grating rotating seat is driven by the driver to rotate so as to split an incident light beam;
the emergent angle rotating platform is connected with the incident angle rotating platform, and the emergent angle rotating platform rotates under the drive of the driver, so that the split light beam is incident to the imager at a specified emergent angle;
the imager is used for receiving the emergent light beam at a specified imaging distance and imaging;
the controller is connected with the imager and is used for comparing the light source spectrum obtained after imaging with the calibration spectrum and controlling the action of the driver in a feedback mode according to the comparison result.
2. The automatic calibration device of a spectrometer of claim 1, wherein the illuminator comprises a light source, a diaphragm, an optical fiber, and a wavelength division multiplexer; the light beam emitted by the light source enters the optical fiber through a fan-shaped light passing area on the diaphragm, and the light entering the optical fiber enters the collimator through the wavelength division multiplexer;
the collimator passes through collimator mount fixed connection on the rotatory platform of angle of incidence, and the rotatory platform of angle of incidence is contactless with the grating roating seat, and the rotatory platform of angle of incidence passes through the dead lever and connects the rotatory platform of emergence angle, and the rotatory platform of emergence angle drives the rotatory platform of angle of incidence and rotates together, but the collimator can not rotate along with the rotatory platform of emergence angle, and the rotatory platform of angle of incidence can only drive the collimator rotatory through the collimator mount.
3. A spectrometer auto-calibration device according to claim 1, wherein the specified angle of incidence is derived from a specified wavelength range, said specified angle of incidence being the angle of incidence of the central wavelength, in particular: obtaining a central wavelength according to the maximum wavelength and the minimum wavelength in the specified wavelength range, wherein the incident angle of the central wavelength is equal to the exit angle of the central wavelength; thereby, the incidence angle of the center wavelength is obtained by the center wavelength and the grating constant：/>The method comprises the steps of carrying out a first treatment on the surface of the Wherein d is a grating constant, m is a diffraction order, < ->Is the center wavelength.
4. An automatic calibration device for a spectrometer according to claim 1, wherein the specified exit angle is obtained from a specified wavelength rangeSpecifically:
wherein ,emergence angle for maximum wavelength, +.>An exit angle of the minimum wavelength, d is a grating constant, m is a diffraction order, +.>Maximum wavelength, +.>Is the minimum wavelength, +.>To specify the angle of incidence.
5. The automatic calibration device of claim 1, wherein the driver comprises an incident angle rotating motor for driving the incident angle rotating platform to rotate, an emergent angle rotating motor for driving the emergent angle rotating platform to rotate, and a grating rotating motor for driving the grating rotating seat to rotate.
6. An automatic calibration device for a spectrometer, as claimed in claim 5,
obtaining the movement distance of the incident angle rotating motor according to the designated incident angleRotating electrical machine by controlling incident angle according to +.>Performing actions so as to drive the incident angle rotating platform to rotate;
wherein the incident angle is the movement distance of the rotating motorThe method comprises the following steps: />，/>To specify the angle of incidence +.>Rotating a radius of rotation of the platform for an angle of incidence;
obtaining the movement distance of the angle-of-departure rotating electric machine according to the specified angle of departureBy controlling the emergence angle the rotating electrical machine is according to +.>Performing actions so as to drive the emergent angle rotating platform to rotate;
wherein the movement distance of the emergence angle rotating motorThe method comprises the following steps: />，/>For the specified emergence angle->The radius of rotation of the platform is rotated for the exit angle.
7. The automatic calibration device of a spectrometer of claim 1, wherein the imager comprises a focusing lens, a focusing lens holder, an X-axis displacement stage, an X-axis displacement motor, a detector rotation stage, an XYZ-axis displacement stage, an X-axis motor, a Y-axis motor, and a Z-axis motor;
the focusing lens is used for receiving the split light beam which is incident at the specified exit angle, and is fixed on the X-axis displacement platform through the focusing lens fixing frame, and the X-axis displacement platform moves under the drive of the X-axis displacement motor;
the detector is arranged on the detector rotating platform and is driven by the detector rotating platform to rotate; the detector rotating platform is arranged on the XYZ-axis displacement platform, and the detector is driven by the X-axis motor, the Y-axis motor and the Z-axis motor to move along the X-axis, the Y-axis or the Z-axis by the detector rotating platform;
thereby adjusting the distance between the focusing lens and the detector to image on the detector and obtain the light source spectrum.
8. The automatic calibration device of claim 7, wherein adjusting the distance between the focusing lens and the detector comprises:
according to the specified wavelengthEmergence angle of maximum wavelength->Emergence angle of minimum wavelength->And focusing lens focal length +.>Obtaining the imaging detector camera pixelLength->：
Length of camera pixel of imaging detectorAnd the actual detector camera element length +.>And (3) making the difference:
wherein ,is the difference;
to be used forThe minimum is to adjust the focus lens focal length for the adjustment target, and the final imaging detector camera pixel length is determined according to the final determined focus lens focal length, so as to adjust the positions of the focus lens and the detector.
9. The automatic calibration device for a spectrometer of claim 1, wherein the process of comparing the light source spectrum with the calibration spectrum comprises: if the light source spectrum and the light with the same wavelength in the calibration spectrum appear on the same pixel of the detector, the light source spectrum and the light with the same wavelength in the calibration spectrum are consistent, and the spectrometer has no offset error; otherwise, the spectrometer is inconsistent, and when the drift error exceeds the error allowable range, judging whether the driver moves to a specified distance, and continuing to adjust and calibrate until the drift error meets the error allowable range.
10. A method for automatically calibrating a spectrometer, characterized in that it comprises the steps of:
after the generated light beam is incident to the collimator, the movement distance of the incident angle rotating motor is obtained according to the appointed incident angle, so that the incident angle rotating platform is driven to rotate by controlling the action of the incident angle rotating motor, and the light beam is incident to the grating from the collimator at the appointed incident angle;
the grating rotating seat is driven to rotate by controlling the action of the grating rotating motor, so that the grating splits the incident light beam;
obtaining the movement distance of the emergent angle rotating motor according to the appointed emergent angle, so that the emergent angle rotating platform is driven to rotate by controlling the action of the emergent angle rotating motor, the split light beam is made to enter the imager at the appointed emergent angle, and the light source spectrum is obtained at the appointed imaging distance;
and comparing the light source spectrum with the calibration spectrum, and controlling the action of the driver in a feedback mode according to the comparison result.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10218947A1 (en) * | 2002-04-22 | 2003-11-13 | Deutsch Zentr Luft & Raumfahrt | Spectral radiometer or optical instrument calibration device comprises a light source and displaceable mirror that can be used for deflecting a collimated calibration light beam onto the optical instrument |
| WO2012015264A2 (en) * | 2010-07-30 | 2012-02-02 | 경북대학교 산학협력단 | Full-range calibration apparatus for a spectrometer for analysis of the light spectrum, and method for acquiring information using the apparatus |
| CN108700461A (en) * | 2015-12-29 | 2018-10-23 | 欧克解析公司 | Compact optical spectrometer |
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2023
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10218947A1 (en) * | 2002-04-22 | 2003-11-13 | Deutsch Zentr Luft & Raumfahrt | Spectral radiometer or optical instrument calibration device comprises a light source and displaceable mirror that can be used for deflecting a collimated calibration light beam onto the optical instrument |
| WO2012015264A2 (en) * | 2010-07-30 | 2012-02-02 | 경북대학교 산학협력단 | Full-range calibration apparatus for a spectrometer for analysis of the light spectrum, and method for acquiring information using the apparatus |
| CN108700461A (en) * | 2015-12-29 | 2018-10-23 | 欧克解析公司 | Compact optical spectrometer |
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| Title |
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| 陈志伟等: "光纤光栅传感系统的信号解调", 光电技术应用, vol. 27, no. 2, pages 48 * |
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