CN117470373A - Rotary grating spectrometer and control method thereof - Google Patents

Rotary grating spectrometer and control method thereof Download PDF

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Publication number
CN117470373A
CN117470373A CN202311412418.9A CN202311412418A CN117470373A CN 117470373 A CN117470373 A CN 117470373A CN 202311412418 A CN202311412418 A CN 202311412418A CN 117470373 A CN117470373 A CN 117470373A
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CN
China
Prior art keywords
grating
working environment
turntable
air pressure
temperature
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CN202311412418.9A
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Chinese (zh)
Inventor
刘鸿飞
林志斌
洪恒远
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Optosky Xiamen Optoelectronic Co ltd
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Optosky Xiamen Optoelectronic Co ltd
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Priority to CN202311412418.9A priority Critical patent/CN117470373A/en
Publication of CN117470373A publication Critical patent/CN117470373A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0202—Mechanical elements; Supports for optical elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0278—Control or determination of height or angle information for sensors or receivers
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
    • G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

The invention relates to a rotary grating spectrometer and a control method thereof, wherein a grating turntable is provided with a grating. The power device is connected with the grating turntable and drives the grating turntable to rotate. The detection device is connected with the power device and is used for detecting the angle position of the grating turntable. The controller controls the driving of the power device to the grating turntable based on the angle position of the grating turntable detected by the detection device. The air pressure control device can be used to keep the air pressure in the working environment constant. Therefore, the problem that the thermal expansion coefficient of the material changes due to the change of the air pressure in the working environment can be avoided. The temperature control device can be used to keep the temperature in the working environment constant. Therefore, the problem of thermal expansion and cold contraction of materials caused by temperature change in the working environment can be avoided. Therefore, the power device, the grating turntable and the detection device can be prevented from generating dimensional deformation, the dimensional stability is ensured, the deviation is avoided, and the detection precision is improved.

Description

Rotary grating spectrometer and control method thereof
Technical Field
The invention relates to the field of optical detection, in particular to a rotary grating spectrometer and a control method thereof.
Background
The grating is used as an important spectroscope, and the selection and performance of the grating directly influence the performance of the whole system. The optical path principle of the spectrometer is that incident light is received by the detector after being reflected by the collimating reflector, the grating and the focusing reflector in sequence. After the grating rotates by an angle, the spectral range of the position of the detector can be changed. Therefore, the grating is made into a rotatable scheme, so that the spectrometer can realize a wider spectrum working range.
Conventional spectrometers use only a single fixed grating, which places certain limitations on the parameters of the spectrometer (e.g., operating range, resolution, etc.). Currently, some solutions using a rotating grating are available in the market, so that the parameters of the spectrometer can be changed along with the rotation of the grating, i.e. the spectrometer of the rotating grating solution, although with a wider working range, and variable parameters. However, the rotation precision of the grating can be influenced by the processing and assembling precision of the turntable, the thermal expansion coefficient of the material, the rotation control precision and the like, so that the detection precision of the spectrometer is influenced, and the problem that the detection precision of the spectrometer of the rotary grating is poorer than that of a conventional spectrometer is caused.
Disclosure of Invention
The invention aims to provide a rotary grating spectrometer so as to improve the detection precision of the rotary grating spectrometer.
The invention also aims to provide a control method of the rotary grating spectrometer, so as to improve the detection precision when the rotary grating spectrometer is used.
In order to solve the technical problems, the invention adopts the following technical scheme.
According to one object of the present invention, there is provided a rotary grating spectrometer comprising: a grating turntable on which a grating is mounted; the power device is connected with the grating turntable and drives the grating turntable to rotate; the detection device is connected with the power device and is used for detecting the angle position of the grating turntable; a controller for controlling the driving of the grating turntable by the power device based on the angular position of the grating turntable detected by the detection device; the air pressure control device comprises an air pressure detector, a pressurizing assembly and a pressure relief assembly, wherein the air pressure detector is used for detecting air pressure of the grating turntable, the power device and the working environment where the detecting device is located, the pressurizing assembly is used for pressurizing the working environment, and the pressure relief assembly is used for depressurizing the working environment so that the air pressure control device can be used for keeping the air pressure in the working environment constant; the temperature control device comprises a temperature detector, a heating component and a refrigerating component, wherein the temperature detector is used for detecting the temperature of the working environment, the heating component is used for heating the working environment, and the refrigerating component is used for cooling the working environment, so that the temperature control device can be used for keeping the temperature in the working environment constant.
In some embodiments of the present application, the rotary grating spectrometer further comprises a case; the grating turntable, the power device and the detection device are all arranged in the box body; the air pressure control device can be used for keeping the air pressure in the box constant; the temperature control device can be used to keep the temperature within the tank constant.
In some embodiments of the present application, the rotary grating spectrometer further includes a dust removing device and a dehumidifying device; the dust removing device is used for filtering particulate matters in the air in the box body; the dehumidifying device is used for removing moisture in the air in the box body.
According to some embodiments of the present application, a plurality of gratings are mounted on the grating turntable and are arranged around the rotation direction of the grating turntable, and the number of lines of each grating is different.
In some embodiments of the present application, the power plant includes a drive shaft; the grating turntable is assembled on the driving shaft by interference fit; the detection device is assembled on the driving shaft in an interference fit mode.
According to another object of the present invention, there is also provided a method for controlling a rotary grating spectrometer, the rotary grating spectrometer employing the rotary grating spectrometer according to any of the above embodiments, the method comprising: the pressurizing assembly starts to work to pressurize the working environment when the air pressure detector detects the air pressure decrease of the working environment, and to depressurize the working environment when the air pressure detector detects the air pressure increase of the working environment so as to keep the air pressure constant in the working environment; when the temperature detector detects that the temperature of the working environment is reduced, the heating component starts to work to heat the working environment, and when the temperature detector detects that the temperature of the working environment is increased, the refrigerating component starts to work to cool the working environment so as to keep the temperature in the working environment constant; the controller controls the driving of the power device to the grating turntable based on the angular position of the grating turntable detected by the detection device.
In some embodiments of the present application, a reference zero point is set at a rotation position of the grating turntable; when the position of the grating turntable is switched, the power device drives the grating turntable to rotate to the position of the reference zero point, and after the grating turntable stays for a period of time, the grating turntable is driven to rotate from the position of the reference zero point to the position to be adjusted.
In some embodiments of the present application, the controller is configured to: and after the power device drives the grating turntable to rotate to a position to be adjusted, the grating turntable is further driven to continuously rotate to a fine adjustment position.
In some embodiments of the present application, the process of driving the grating turntable by the power device includes an acceleration stage and a deceleration stage, and on a v-t image with time as an abscissa and speed as an ordinate, a track of the acceleration stage and a track of the deceleration stage are mirror images of each other.
In some embodiments of the present application, the acceleration phase is uniform acceleration motion, and the deceleration phase is uniform deceleration motion.
As can be seen from the technical scheme, the embodiment of the invention has at least the following advantages and positive effects:
in the rotary grating spectrometer provided by the embodiment of the invention, the power device can drive the grating turntable to rotate so as to change the spectrum range of the position of the detector of the spectrometer, so that the spectrometer can realize a wider spectrum working range. The power device is connected with the grating turntable, and the detection device is connected with the power device, so that the problem that the detection precision is poor due to the fact that the mutual position relation of the grating turntable, the power device and the power device generates fine deviation to influence the rotation precision due to the fact that the size changes when the manufacturing materials of the grating turntable, the power device and the power device generate thermal expansion and cold contraction phenomena is solved. The air pressure control device is used for keeping the air pressure in the working environment where the grating turntable, the power device and the detection device are positioned constant, so that the problem that the thermal expansion coefficient of the material changes due to the change of the air pressure in the working environment can be avoided. Meanwhile, the temperature control device is used for keeping the temperature of the grating turntable, the power device and the detection device in the working environment constant, so that the problem of thermal expansion and cold contraction of materials caused by temperature change in the working environment can be avoided. Therefore, the pneumatic control device is matched with the temperature control device, so that the power device, the grating turntable and the detection device can be prevented from being deformed in size, the stability of the power device, the grating turntable and the detection device in size is ensured not to deviate, and the detection precision of the rotary grating spectrometer is improved.
Drawings
Various objects, features and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the invention, when taken in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the invention and are not necessarily drawn to scale. In the drawings, like reference numerals refer to the same or similar parts throughout.
Wherein:
fig. 1 is a schematic diagram of a rotary grating spectrometer according to an embodiment of the present invention.
Fig. 2 is a schematic view of the structure of fig. 1 at another angle with the housing, air pressure control device and temperature control device removed.
Fig. 3 is a cross-sectional view of fig. 2 at another angle.
FIG. 4 is a schematic diagram of the connection of a rotary grating spectrometer according to an embodiment of the present invention.
Fig. 5 is a v-t image of the rotation of the grating turret.
FIG. 6 is an a-t image of the rotation of the grating turret.
Fig. 7 is an explanatory view of angular position adjustment of the grating turntable.
The reference numerals are explained as follows: 1. a grating turntable; 2. a power device; 21. a drive shaft; 22. a motor; 23. a speed reducer; 24. a transmission gear; 3. a detection device; 31. an encoder stator; 32. an encoder rotor; 4. an air pressure control device; 5. a temperature control device; 6. a case;
Detailed Description
While this invention is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to that as illustrated.
Thus, rather than implying that each embodiment of the present invention must have the characteristics described, one of the characteristics indicated in this specification will be used to describe one embodiment of the present invention. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
Referring to fig. 1 to 4, an embodiment of the present invention provides a rotary grating spectrometer, which includes a grating turntable 1, a power device 2, a detection device 3, a controller, an air pressure control device 4 and a temperature control device 5.
The grating turntable 1 is provided with a grating. The power device 2 is connected with the grating rotary table 1, and the power device 2 drives the grating rotary table 1 to rotate. The detection device 3 is connected with the power device 2, and the detection device 3 is used for detecting the angle position of the grating rotary table 1. The controller controls the driving of the grating turntable 1 by the power unit 2 based on the angular position of the grating turntable 1 detected by the detection unit 3.
The air pressure control device 4 comprises an air pressure detector, a pressurizing component and a pressure relief component, wherein the air pressure detector is used for detecting air pressure of the working environment where the grating turntable 1, the power device 2 and the detecting device 3 are located, the pressurizing component is used for pressurizing the working environment, and the pressure relief component is used for depressurizing the working environment, so that the air pressure control device 4 can be used for keeping the air pressure in the working environment constant.
Specifically, when the air pressure detector detects a decrease in the air pressure of the working environment in which the grating turntable 1, the power unit 2, and the detection unit 3 are located, the pressurizing assembly starts to operate to pressurize the working environment. When the air pressure detector detects that the air pressure of the working environment where the grating turntable 1, the power device 2 and the detection device 3 are positioned is increased, the pressure relief assembly starts to work to relieve the pressure of the working environment. Therefore, the air pressure in the working environment can be kept constant through the air pressure detector, the pressurizing assembly and the pressure relief assembly.
The temperature control device 5 comprises a temperature detector, a heating component and a refrigerating component, wherein the temperature detector is used for detecting the temperature of the working environment, the heating component is used for heating the working environment, and the refrigerating component is used for cooling the working environment, so that the temperature control device 5 can be used for keeping the temperature in the working environment constant.
Specifically, when the temperature detector detects a decrease in the temperature of the working environment in which the grating turntable 1, the power unit 2, and the detection unit 3 are located, the heating assembly starts to operate to raise the temperature of the working environment. When the temperature detector detects that the temperature of the working environment where the grating turntable 1, the power device 2 and the detection device 3 are positioned is increased, the refrigeration component starts to work to cool the working environment. The temperature in the working environment can be kept constant through the temperature detector, the heating component and the refrigerating component.
Through the above structural design, the power device 2 can drive the grating turntable 1 to rotate so as to change the spectrum range of the position of the detector of the spectrometer, so that the spectrometer can realize a wider spectrum working range. The power device 2 is connected with the grating rotary table 1, the detection device 3 is connected with the power device 2, and in order to reduce the size change when the manufacturing materials of the grating rotary table 1, the power device 2 and the power device 2 are subjected to thermal expansion and contraction, the mutual position relation of the three is slightly shifted to influence the rotation precision, so that the problem of poor detection precision is solved. The air pressure control device 4 is used for keeping the air pressure in the working environments of the grating rotary table 1, the power device 2 and the detection device 3 constant, so that the problem that the thermal expansion coefficient of a material changes due to the change of the air pressure in the working environments can be avoided.
Meanwhile, the temperature control device 5 is used for keeping the temperature of the grating turntable 1, the power device 2 and the detection device 3 in the working environment constant, so that the problem of thermal expansion and cold contraction of materials caused by temperature change in the working environment can be avoided. Therefore, the pneumatic control device 4 is matched with the temperature control device 5, so that the power device 2, the grating turntable 1 and the detection device 3 can be prevented from being deformed in size, the stability of the power device 2, the grating turntable 1 and the detection device 3 in size is ensured not to deviate, and the detection precision of the rotary grating spectrometer is improved.
The contact surfaces of the grating turntable 1, the power unit 2 and the power unit 2, and the rest structural members related to the three parts have differences in materials and sizes. When the air pressure of the working environment changes, the thermal expansion coefficient of the material is affected, and even if the thermal expansion coefficients of the grating turntable 1, the power device 2 and the power device 2 change at the same environmental temperature, the structural dimension changes, so that the detection accuracy is affected by the deviation. When the temperature of the working environment changes, the material can expand with heat and contract with cold, and the structural size can also change. In order to solve such problems, the working environment of the grating turret 1 of the embodiment needs to be stabilized by adding the air pressure control device 4 and the temperature control device 5 to the working environment air pressure and temperature of the grating turret 1, the power device 2 and the detection device 3.
The rotary grating spectrometer further comprises a housing 6. The grating turntable 1, the power device 2 and the detection device 3 are all arranged in the box body 6. The air pressure control device 4 can be used to keep the air pressure in the tank 6 constant. The temperature control device 5 can be used to keep the temperature inside the tank 6 constant. The box 6 provides a closed working environment for the grating turntable 1, the power device 2 and the detection device 3, so that the air pressure control device 4 can better keep the air pressure of the working environment constant, and the temperature control device 5 can better keep the temperature of the working environment constant.
A plurality of gratings are mounted on the grating turntable 1 and arranged around the rotation direction of the grating turntable 1, and the number of lines of each grating is different. Through installing a plurality of gratings with different line numbers, when the grating turntable 1 rotates, the gratings can be switched among different gratings, so that parameters such as resolution, sensitivity and the like of a spectrum can be adjusted, and the application range of the rotary grating spectrometer is improved.
The power plant 2 comprises a drive shaft 21. The grating rotary table 1 is assembled on the driving shaft 21 by interference fit, and the grating rotary table 1 is driven to rotate when the driving shaft 21 rotates. The detection device 3 is fitted to the drive shaft 21 with an interference fit. Through interference fit's form for the connection between grating revolving stage 1 and the power device 2 is more stable, and the connection between power device 2 and the detection device 3 is more stable, avoids grating revolving stage 1, power device 2 and detection device 3 three's positional relationship to take place the skew and influences the detection precision.
The power plant 2 further comprises an electric motor 22 and a reduction gear 23. The output end of the motor 22 is connected with the input end of the speed reducer 23, and the output end of the speed reducer 23 is connected with the driving shaft 21. The speed reducer 23 reduces the output rotation speed, increases the torque, and improves the load capacity, thereby achieving the ideal transmission effect and meeting the working requirements.
The control accuracy of the power device 2 needs to meet the requirement of minimum rotation accuracy of the grating turret 1, and a device comprising a motor 22 and a speed reducer 23 is used. The detection precision of the detection device 3 also needs to meet the requirement of the minimum rotation precision of the grating turntable 1, and devices such as an encoder, an angle sensor and the like can be adopted. The controller controls the grating turntable 1 to precisely rotate to the position set by the user by combining the angle position of the grating turntable 1 set by the user and the detection position of the detection device 3.
In this embodiment, the power plant 2 further comprises a transmission gear 24. The output end of the speed reducer 23 is in transmission connection with a transmission gear 24, and the transmission gear 24 is in transmission connection with the driving shaft 21. The detecting device 3 employs an encoder including an encoder stator 31 and an encoder rotor 32 rotatably fitted within the encoder stator 31. The grating turret 1 is fitted to the drive shaft 21 with an interference fit, and the encoder rotor 32 is fitted to the drive shaft 21 with an interference fit.
The installation form of interference fit can be, offer the connecting hole respectively at grating revolving stage 1 and detection device 3, cool down to the drive shaft 21, the connecting piece shrinkage, insert the drive shaft 21 after the low temperature cooling and establish to grating revolving stage 1 and detection device 3 in the connecting hole of each, the interference fit is in grating revolving stage 1 and detection device 3 in each connecting hole after the connecting piece intensification expansion. Of course, the assembly may be accomplished in a low temperature environment. When the encoder is used for the detection device 3, the encoder rotor 32 is self-fixed to the connection hole, and no hole is required.
The installation form of interference fit can also be that the grating turntable 1 and the detection device 3 are respectively provided with a connecting hole, the temperature of the grating turntable 1 and the detection device 3 is raised to expand the connecting holes, a connecting piece is inserted into the connecting holes of the grating turntable 1 and the detection device 3, and the connecting piece is assembled in the connecting holes of the grating turntable 1 and the detection device 3 in an interference mode after the temperature is reduced.
Of course, the same processing technique can be realized by adopting excessive or clearance fit, adding and smearing materials greatly affected by temperature change on the contact surface of the driving shaft 21 and the connecting hole and utilizing the principle of thermal expansion and cold contraction.
It should be noted that the detecting device 3 may directly detect the angular position of the grating rotary table 1, or may be a structural member having a linkage relationship with the grating rotary table 1.
The rotary grating spectrometer also comprises a dust removing device and a dehumidifying device. The dust removing device is used for filtering particulate matters in the air in the box body 6 so as to keep the air in the box body 6 clean and avoid dust falling at the rotating connection part of the power device 2, thereby influencing the rotating precision. The dehumidifying device is used for removing moisture in the air in the box 6, so that the influence of the moisture on the optical element is avoided.
When the air pressure detector detects that the air pressure in the case 6 is too low, the pressurizing assembly is started to suck air from the outside. The external air firstly passes through a dust removing device and a dehumidifying device to remove the particulate matters and moisture of the air.
When the air pressure detector detects that the air pressure in the box body 6 is too high, the pressure relief assembly can outwards release certain air to reduce the air pressure in the box body 6, and meanwhile, the pressurizing assembly is closed to stop sucking external air until the air pressure is stabilized at an ideal value. When the air pressure is stabilized at an ideal value, the pressurizing assembly stops working, and the pressure relief assembly does not relieve pressure any more.
When the temperature detector detects that the temperature in the box 6 is too low, the heating assembly is started to heat the air. When the temperature detector detects that the temperature inside the box 6 is too high, the refrigerating assembly is started to cool the air. When the temperature is stabilized at the ideal value, the heating component stops heating, and the refrigerating component does not refrigerate any more.
The gas inside the box 6 can also circulate back and forth between the heating assembly and the refrigerating assembly, and the temperature inside the box 6 is regulated in real time.
The embodiment of the invention also provides a control method of the rotary grating spectrometer, which is used for controlling the rotary grating spectrometer provided by the embodiment, and the control method of the rotary grating spectrometer comprises the following steps.
When the air pressure detector detects that the air pressure of the working environment is reduced, the pressurizing assembly starts to work to pressurize the working environment, and when the air pressure detector detects that the air pressure of the working environment is increased, the pressurizing assembly starts to work to depressurize the working environment so as to keep the air pressure in the working environment constant.
When the temperature detector detects that the temperature of the working environment is reduced, the heating assembly starts to work to heat the working environment, and when the temperature detector detects that the temperature of the working environment is increased, the refrigerating assembly starts to work to cool the working environment so as to keep the temperature in the working environment constant.
The controller controls the driving of the grating turntable 1 by the power unit 2 based on the angular position of the grating turntable 1 detected by the detection unit 3.
By the control method, the air pressure and the temperature in the working environments of the grating rotary table 1, the power device 2 and the detection device 3 can be kept constant, the power device 2, the grating rotary table 1 and the detection device 3 are prevented from being deformed in size due to expansion caused by heat and contraction caused by cold, the stable size of the power device 2, the grating rotary table 1 and the detection device 3 is ensured, the deviation is avoided, and the detection precision of the rotary grating spectrometer is improved.
The air pressure control device 4 and the temperature control device 5 can be connected to a controller and controlled by the controller, or can be provided with independent control systems respectively.
Referring to fig. 5, the process of driving the grating turntable 1 by the power device 2 includes an acceleration stage and a deceleration stage, and on a v-t image with time as an abscissa and speed as an ordinate, the track of the acceleration stage and the track of the deceleration stage are mirror images of each other. Therefore, fine offset generated at the structural connection parts of the grating turntable 1, the power device 2 and the detection device 3 caused by inertia force in an acceleration stage and a deceleration stage can be reduced to the greatest extent, and the detection precision is further improved.
Referring to fig. 6, in an embodiment, the acceleration stage is uniform acceleration motion, i.e., the track of the acceleration stage is a straight line, and the deceleration stage is uniform deceleration motion, i.e., the track of the deceleration stage is a straight line. And the acceleration of uniform acceleration is equal to the absolute value of the acceleration of uniform deceleration, so that the rotation process of the grating turntable 1 is smoother.
In other embodiments, the track of the acceleration phase and the track of the deceleration phase may be S-shaped curves or arcs, etc., which are not intended to be exhaustive.
Referring to fig. 7, the control method further includes setting a reference zero point at the rotation position of the grating turntable 1. When the position of the grating rotary table 1 is switched, the power device 2 drives the grating rotary table 1 to rotate to the position of the reference zero point, and after the grating rotary table stays for a period of time, the grating rotary table 1 is driven to rotate from the position of the reference zero point to the position to be adjusted. Specifically, with the O point in fig. 3 as the reference zero point, the grating turntable 1 is at the position of the a point, when the positions of the grating turntable 1 to the B point need to be adjusted, the grating turntable 1 is driven to rotate to the O point, and after a period of time, the grating turntable 1 is driven to rotate to the B point. Therefore, the minimum difference of the rotating travel of the grating rotary table 1 is ensured each time the grating rotary table 1 rotates to a required position, so that the detection precision is improved.
The controller is configured to: after the power device 2 drives the grating turntable 1 to rotate to a position to be adjusted, the grating turntable 1 is further driven to continuously rotate to a fine adjustment position, and the accuracy of the rotation precision is further ensured.
The rotation precision can be further improved by combining a control method that the track in the acceleration stage and the track in the deceleration stage are mirror images of each other.
While the invention has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A rotary grating spectrometer, comprising:
a grating turntable on which a grating is mounted;
the power device is connected with the grating turntable and drives the grating turntable to rotate;
the detection device is connected with the power device and is used for detecting the angle position of the grating turntable;
a controller for controlling the driving of the grating turntable by the power device based on the angular position of the grating turntable detected by the detection device;
the air pressure control device comprises an air pressure detector, a pressurizing assembly and a pressure relief assembly, wherein the air pressure detector is used for detecting air pressure of the grating turntable, the power device and the working environment where the detecting device is located, the pressurizing assembly is used for pressurizing the working environment, and the pressure relief assembly is used for depressurizing the working environment so that the air pressure control device can be used for keeping the air pressure in the working environment constant;
the temperature control device comprises a temperature detector, a heating component and a refrigerating component, wherein the temperature detector is used for detecting the temperature of the working environment, the heating component is used for heating the working environment, and the refrigerating component is used for cooling the working environment, so that the temperature control device can be used for keeping the temperature in the working environment constant.
2. The rotary grating spectrometer of claim 1, further comprising a housing;
the grating turntable, the power device and the detection device are all arranged in the box body;
the air pressure control device can be used for keeping the air pressure in the box constant;
the temperature control device can be used to keep the temperature within the tank constant.
3. The rotary grating spectrometer of claim 2, further comprising a dust removal device and a dehumidification device;
the dust removing device is used for filtering particulate matters in the air in the box body;
the dehumidifying device is used for removing moisture in the air in the box body.
4. The rotary grating spectrometer according to claim 1, wherein a plurality of gratings are mounted on the grating turntable, the number of lines of each grating being different, the gratings being arranged around the rotation direction of the grating turntable.
5. The rotary grating spectrometer of claim 1, wherein the power device comprises a drive shaft;
the grating turntable is assembled on the driving shaft by interference fit;
the detection device is assembled on the driving shaft in an interference fit mode.
6. A control method of a rotary grating spectrometer, wherein the rotary grating spectrometer employs the rotary grating spectrometer of any one of claims 1-5, the control method comprising:
the pressurizing assembly starts to work to pressurize the working environment when the air pressure detector detects the air pressure decrease of the working environment, and to depressurize the working environment when the air pressure detector detects the air pressure increase of the working environment so as to keep the air pressure constant in the working environment;
when the temperature detector detects that the temperature of the working environment is reduced, the heating component starts to work to heat the working environment, and when the temperature detector detects that the temperature of the working environment is increased, the refrigerating component starts to work to cool the working environment so as to keep the temperature in the working environment constant;
the controller controls the driving of the power device to the grating turntable based on the angular position of the grating turntable detected by the detection device.
7. The method of claim 6, wherein a reference zero is set at a rotation position of the grating turntable;
when the position of the grating turntable is switched, the power device drives the grating turntable to rotate to the position of the reference zero point, and after the grating turntable stays for a period of time, the grating turntable is driven to rotate from the position of the reference zero point to the position to be adjusted.
8. The method of claim 7, wherein the controller is configured to: and after the power device drives the grating turntable to rotate to a position to be adjusted, the grating turntable is further driven to continuously rotate to a fine adjustment position.
9. The method according to claim 6, wherein the process of driving the grating turntable by the power unit includes an acceleration stage and a deceleration stage, and the trajectory of the acceleration stage and the trajectory of the deceleration stage are mirror images of each other on a v-t image with time as an abscissa and speed as an ordinate.
10. The method of claim 9, wherein the acceleration phase is a uniform acceleration motion and the deceleration phase is a uniform deceleration motion.
CN202311412418.9A 2023-10-27 2023-10-27 Rotary grating spectrometer and control method thereof Pending CN117470373A (en)

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