CN109342336B - Spectrometer system and device for deducting dark background in real time - Google Patents
Spectrometer system and device for deducting dark background in real time Download PDFInfo
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- CN109342336B CN109342336B CN201811504190.5A CN201811504190A CN109342336B CN 109342336 B CN109342336 B CN 109342336B CN 201811504190 A CN201811504190 A CN 201811504190A CN 109342336 B CN109342336 B CN 109342336B
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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Abstract
The invention discloses a spectrometer system for deducting a dark background in real time, which comprises a light shield, a motor, a controller, a spectrometer, a temperature sensor and an optical fiber port, wherein one end of the light shield is connected to a driving rod of the motor, the motor is connected with the controller through a lead, and the controller is connected with a computer through a lead. According to the invention, the temperature sensor is additionally arranged at the chip of the spectrometer, the temperature change of the chip is detected in real time, the proper temperature change threshold is set, when the temperature change exceeds the threshold, the system controls the light shield to turn over through the motor, the spectrometer collects the dark background spectrum and updates the existing dark background spectrum, therefore, when the temperature changes, the dark background spectrum also changes, the updated dark background spectrum is subtracted from the spectrum collected by the spectrometer, and the real material spectrum which does not change along with the temperature is obtained, so that the accurate detection of the material spectrum is realized, and the accuracy of material sorting is further improved; the invention has good social benefit and is suitable for popularization and use.
Description
Technical Field
The invention relates to a spectrometer system, in particular to a spectrometer system and a device for deducting dark background in real time, and belongs to the technical field of application of spectrometer systems.
Background
With the great application of color sorters in the grain and oil industry, the color sorter industry in China develops more and more mature, the variety specifications are more and more, the sorting application range is wider and wider from the initial sorting of rice and coarse cereals to the current plastic sorting, and from the chromaticity, color difference and shape sorting to the current spectrum sorting, and meanwhile, the requirement on detection equipment is higher and higher.
When materials such as plastics or fruits are sorted, the spectrum information of the materials is usually identified by using a spectrometer, the traditional fiber spectrometer is composed of a CCD detection chip, a focusing lens, a collimating lens, a grating, a slit and the like, different material spectrums are different, and the materials can be identified through the spectrum differences and then sorted.
The actual spectrum of the material is the spectrum of the spectrum obtained by a spectrometer with a dark background removed, the spectrum of the dark background is the spectrum obtained by the spectrometer without illumination, the largest factor influencing the spectrum of the dark background is the temperature, the current spectrum detection scheme of the material is that the spectrum of the dark background is obtained before the material is detected, the spectrum obtained by the spectrometer subtracts the fixed spectrum of the dark background, but the spectrum of the material is obtained as the ambient temperature changes along with the operation of the equipment, the temperature at the chip of the spectrometer is difficult to avoid fluctuation, the chip noise is greatly influenced by the temperature, the spectrum of the dark background is changed at the moment, and if the spectrum obtained by the spectrometer subtracts the fixed spectrum of the dark background as the spectrum of the material, the spectrum of the material is different from the spectrum of the real material, so that the subsequent spectrum processing is inaccurate, and the sorting accuracy is further influenced.
Disclosure of Invention
The invention aims to solve the problems that the current material spectrum detection scheme is to obtain the spectrum of a material by measuring a dark background spectrum before the material is detected and subtracting a fixed dark background spectrum from the spectrum measured by a spectrometer, the temperature of a spectrometer chip fluctuates along with the operation of equipment and the change of the environmental temperature, the chip noise is greatly influenced by the temperature, the dark background spectrum is changed definitely at the moment, if the fixed dark background spectrum is subtracted from the spectrum measured by the spectrometer as the material spectrum, the spectrum is different from the real material spectrum, the subsequent spectrum processing is inaccurate, and the sorting accuracy is influenced, and provides a spectrometer system for deducting the dark background in real time. When the temperature changes and exceeds the threshold value, the system controls the light shield to turn over, the spectrometer collects the dark background spectrum and updates the existing dark background spectrum, therefore, when the temperature changes, the dark background spectrum changes along with the change, the updated dark background spectrum is subtracted from the spectrum collected by the spectrometer, and the real material spectrum which does not change along with the temperature is obtained, so that the accurate detection of the material spectrum is realized, and the accuracy of material sorting is improved.
The purpose of the invention can be realized by the following technical scheme: a spectrometer system for deducting dark background in real time comprises a light shield, a motor, a controller, a spectrometer, a temperature sensor and an optical fiber port, wherein one end of the light shield is connected to a driving rod of the motor, the motor is connected with the controller through a lead, the controller is connected with a computer through a lead, and the computer is connected with the spectrometer through a lead;
a temperature sensor is arranged in the spectrometer, a spectrum signal sensor is electrically connected below the temperature sensor, and one end of the spectrometer is connected with an optical fiber port through an optical fiber;
the motor is used for controlling the horizontal or vertical turning of the light shield;
the controller is used for sending a signal to the motor;
the computer is used for receiving the temperature information transmitted by the temperature sensor;
the optical fiber is used for transmitting the spectrum signal into the spectrometer;
the optical fiber port is used for receiving optical spectrum signals.
The invention has further technical improvements that: the motor passes through actuating lever and light to keep off swing joint, and the controller passes through wire and motor communication connection.
The invention has further technical improvements that: the spectral signal sensor is used for processing material spectral signals.
The invention has further technical improvements that: the spectrometer is in communication connection with the optical fiber port through an optical fiber, and the computer is in communication connection with the controller through a wire.
The invention has further technical improvements that: the computer is in communication connection with the temperature sensor through a wire, and the temperature sensor transmits real-time temperature information to the computer.
The invention has further technical improvements that: the light shield is arranged on one side of the optical fiber port, a gap is formed between the light shield and the optical fiber port, the surface of the light shield is coated with a matte black plastic plate or metal plate, the light shield can be horizontally and vertically turned over, when the light shield is horizontally placed, the light shield covers the optical fiber port, external light cannot be received by the optical fiber, a collected dark background spectrum can be considered, and when the light shield is vertically placed, the optical fiber can receive the external light.
A spectrometer system for deducting dark background in real time specifically comprises the following steps:
the method comprises the following steps: the light shield is initially in a vertical state, the optical fiber port receives material spectrum signals at all times, the computer detects the temperature change of the temperature sensor at all times, when the temperature change exceeds a set threshold value, the computer sends a signal to the controller, the controller sends an instruction to the motor, the motor controls the light shield to turn over to be placed horizontally, at the moment, the optical fiber port receives a spectrum without material information, the spectrum is a dark background spectrum, and the dark background spectrum signals in the system are updated;
step two: after a spectrum acquisition period, the light shield is turned back to a vertical state, the optical fiber port continues to receive the spectrum of the material, at the moment, the real spectrum of the material is obtained by subtracting the just updated dark background spectrum from the acquired spectrum, the dark background spectrum is not updated before the temperature change does not exceed the threshold, and when the temperature change exceeds the threshold, the steps are carried out again, and the dark background is updated again.
The invention has the beneficial effects that: according to the invention, the temperature sensor is additionally arranged at the chip of the spectrometer, the temperature change of the chip is detected in real time, the proper temperature change threshold is set, when the temperature change exceeds the threshold, the system controls the light shield to turn over through the motor, the spectrometer collects the dark background spectrum and updates the existing dark background spectrum, therefore, when the temperature changes, the dark background spectrum also changes, the updated dark background spectrum is subtracted from the spectrum collected by the spectrometer, and the real material spectrum which does not change along with the temperature is obtained, so that the accurate detection of the material spectrum is realized, and the accuracy of material sorting is further improved; the invention has good social benefit and is suitable for popularization and use.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a connection diagram of the overall structure of the present invention.
Fig. 2 is a side view of the connection of the light shield and the motor of the present invention.
Fig. 3 is an overall working flow diagram of the present invention.
In the figure: 1. light blocking; 2. a motor; 3. a controller; 4. a computer; 5. a temperature sensor; 6. a spectral signal sensor; 7. a spectrometer; 8. an optical fiber; 9. a fiber port.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, a spectrometer system for real-time dark background subtraction includes a light shield 1, a motor 2, a controller 3, a spectrometer 7, a temperature sensor 5 and an optical fiber port 9, wherein one end of the light shield 1 is connected to a driving rod of the motor 2, the motor 2 is connected to the controller 3 through a wire, the controller 3 is connected to a computer 4 through a wire, and the computer 4 is connected to the spectrometer 7 through a wire;
a temperature sensor 5 is arranged in the spectrometer 7, a spectral signal sensor 6 is electrically connected below the temperature sensor 5, and one end of the spectrometer 7 is connected with an optical fiber port 9 through an optical fiber 8;
the motor 2 is used for controlling the horizontal or vertical turning of the light shield 1;
the controller 3 is used for sending signals to the motor 2;
the computer 4 is used for receiving the temperature information transmitted by the temperature sensor 5;
the optical fiber 8 is used for transmitting the spectrum signal into the spectrometer 7;
the fiber port 9 is used for receiving the spectral signal.
As a technical optimization scheme of the invention, the motor 2 is movably connected with the light shield 1 through the driving rod, and the controller 3 is in communication connection with the motor 2 through a wire.
As a technical optimization scheme of the invention, the spectral signal sensor 6 is used for processing material spectral signals.
As a technical optimization scheme of the invention, the spectrometer 7 is in communication connection with the optical fiber port 9 through the optical fiber 8, and the computer 4 is in communication connection with the controller 3 through a wire.
As a technical optimization scheme of the invention, the computer 4 is in communication connection with the temperature sensor 5 through a wire, and the temperature sensor 5 transmits real-time temperature information to the computer 4.
As a technical optimization scheme of the invention, the light shield 1 is arranged on one side of the optical fiber port 9, a gap is arranged between the light shield 1 and the optical fiber port 9, the light shield 1 is a plastic plate or a metal plate coated with matte black on the surface and can be horizontally and vertically turned, when the light shield is horizontally placed, the light shield is covered at the optical fiber port, the optical fiber cannot receive external light, the collected dark background spectrum can be considered, and when the light shield is vertically placed, the optical fiber can receive the external light.
A spectrometer system for deducting dark background in real time specifically comprises the following steps:
the method comprises the following steps: the light shield 1 is initially in a vertical state, the optical fiber port 9 receives material spectrum signals at all times, the computer 4 detects temperature change of the temperature sensor 5 at all times, when the temperature change exceeds a set threshold value, the computer 4 sends a signal to the controller 3, the controller 3 sends an instruction to the motor 2, the motor 2 controls the light shield 1 to be turned over to be placed horizontally, at the moment, the optical fiber port 9 receives a spectrum without material information, the spectrum is a dark background spectrum, and dark background spectrum signals in the system are updated;
step two: after a spectrum acquisition period, the light shield 1 is turned back to a vertical state, the optical fiber port 9 continues to receive the spectrum of the material, at this time, the real spectrum of the material is obtained by subtracting the just updated dark background spectrum from the acquired spectrum, the dark background spectrum is not updated until the temperature change does not exceed the threshold, and when the temperature change exceeds the threshold, the steps are carried out again, and the dark background is updated again.
The invention has the beneficial effects that: according to the invention, the temperature sensor 5 is additionally arranged at the chip of the spectrometer 7, the temperature change of the chip is detected in real time, and a proper temperature change threshold value is set, when the temperature change exceeds the threshold value, the system controls the light shield 1 to turn over through the motor 2, the spectrometer 7 collects a dark background spectrum and updates the existing dark background spectrum, so that when the temperature changes, the dark background spectrum changes along with the change, the updated dark background spectrum is subtracted from the spectrum collected by the spectrometer 7, and a real material spectrum which does not change along with the temperature is obtained, so that the accurate detection of the material spectrum is realized, and the accuracy of material sorting is further improved; the invention has good social benefit and is suitable for popularization and use.
The working principle is as follows: when the system is used, firstly, the safety of the system in use is checked, then, the light shield 1 is in an initial vertical state, the optical fiber port 9 receives a material spectrum signal at any time, the computer 4 detects the temperature change of the temperature sensor 5 at any time, when the temperature change exceeds a set threshold value, the computer 4 sends a signal to the controller 3, the controller 3 sends an instruction to the motor 2, the motor 2 controls the light shield 1 to turn over to be placed horizontally, the spectrum without material information is received by the optical fiber port 9 at the moment, the spectrum is considered as a dark background spectrum, and the dark background spectrum signal in the system is updated; after a spectrum acquisition period, the light shield 1 is turned back to a vertical state, the optical fiber port 9 continues to receive the spectrum of the material, at this time, the real spectrum of the material is obtained by subtracting the just updated dark background spectrum from the acquired spectrum, the dark background spectrum is not updated until the temperature change does not exceed the threshold, and when the temperature change exceeds the threshold, the steps are carried out again, and the dark background is updated again.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. A spectrometer device for real-time subtraction of dark background, comprising: the device comprises a light shield (1), a motor (2), a controller (3), a spectrometer (7), a temperature sensor (5) and an optical fiber port (9), wherein one end of the light shield (1) is connected to a driving rod of the motor (2), the motor (2) is connected with the controller (3) through a wire, the controller (3) is connected with a computer (4) through a wire, and the computer (4) is connected with the spectrometer (7) through a wire;
a temperature sensor (5) is arranged in the spectrometer (7), a spectrum signal sensor (6) is electrically connected below the temperature sensor (5), and one end of the spectrometer (7) is connected with an optical fiber port (9) through an optical fiber (8);
the motor (2) is used for controlling the horizontal or vertical turning of the light shield (1);
the controller (3) is used for sending a signal to the motor (2);
the computer (4) is used for receiving the temperature information transmitted by the temperature sensor (5);
the optical fiber (8) is used for transmitting the spectrum signal into the spectrometer (7);
the optical fiber port (9) is used for receiving optical spectrum signals.
2. A spectrometer arrangement for real-time dark background subtraction according to claim 1, wherein the motor (2) is movably connected to the light shield (1) by a driving rod, and the controller (3) is communicatively connected to the motor (2) by a wire.
3. A spectrometer arrangement for real-time subtraction of dark background as claimed in claim 1, characterized in that the spectral signal sensor (6) is arranged to process the material spectral signal.
4. A spectrometer arrangement for real-time dark background subtraction according to claim 1, wherein the spectrometer (7) is communicatively connected to the fiber port (9) via a fiber (8), and the computer (4) is communicatively connected to the controller (3) via a wire.
5. A spectrometer arrangement for real-time subtraction of dark background as claimed in claim 1, wherein the computer (4) is connected in communication with the temperature sensor (5) by wires.
6. A spectrometer arrangement for real-time dark background subtraction according to claim 1, characterized in that the light shield (1) is arranged at one side of the fiber port (9) and a gap is arranged between the light shield (1) and the fiber port (9).
7. A spectrometer system for real-time subtraction of dark background is characterized in that the working method of the system specifically comprises the following steps:
the method comprises the following steps: the light shield (1) is in an initial vertical state, the optical fiber port (9) receives material spectrum signals at all times, the computer (4) detects temperature change of the temperature sensor (5) at all times, when the temperature change exceeds a set threshold value, the computer (4) sends a signal to the controller (3), the controller (3) sends an instruction to the motor (2), the motor (2) controls the light shield (1) to turn over to be placed horizontally, at the moment, the optical fiber port (9) receives a spectrum without material information, the spectrum is a dark background spectrum, and dark background spectrum signals in the system are updated;
step two: after a spectrum acquisition period, the light shield (1) is turned back to a vertical state, the optical fiber port (9) continues to receive the spectrum of the material, at the moment, the real spectrum of the material is obtained by subtracting the just updated dark background spectrum from the acquired spectrum, the dark background spectrum is not updated before the temperature change does not exceed the threshold, and when the temperature change exceeds the threshold, the steps are carried out again, and the dark background is updated again.
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| CN112284535A (en) * | 2020-09-15 | 2021-01-29 | 中国科学院上海技术物理研究所 | Dark background removing method for progressive on-orbit push-scan type medium-short wave infrared imaging spectrometer |
| CN113552084A (en) * | 2021-07-29 | 2021-10-26 | 深圳市先亚生物科技有限公司 | System, method and device for eliminating interference of spectrum detection background signal |
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