CN115876726A - Automatic peak searching method of laser, storage medium and gas concentration detection system - Google Patents
Automatic peak searching method of laser, storage medium and gas concentration detection system Download PDFInfo
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- CN115876726A CN115876726A CN202310051131.1A CN202310051131A CN115876726A CN 115876726 A CN115876726 A CN 115876726A CN 202310051131 A CN202310051131 A CN 202310051131A CN 115876726 A CN115876726 A CN 115876726A
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Abstract
The invention discloses an automatic peak searching method of a laser, a storage medium and a gas concentration detection system. The method is applied to a gas concentration detection system, the gas concentration detection system comprises a laser, a gas absorption cell and a photoelectric detector, a laser signal emitted by the laser passes through the gas absorption cell to the photoelectric detector, and the method comprises the following steps: initializing the working temperature of the laser; collecting absorption waveform data detected by the photoelectric detector, and judging whether an absorption peak exists according to the absorption waveform data; if so, calculating a difference value between the position of the absorption peak and the central position of the absorption waveform data; and adjusting the bias current and/or the working temperature of the laser according to the difference, and returning to the step of collecting the absorption waveform data detected by the photoelectric detector until the difference is smaller than a preset difference threshold. The method does not need manual operation, can realize automatic peak searching, and has high peak searching accuracy.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to an automatic peak searching method of a laser, a storage medium and a gas concentration detection system.
Background
In a gas sensor based on a tunable diode laser absorption spectrum technology, finding a gas absorption peak is a very important link in a production calibration process, and meanwhile, because the influence of the working temperature change of a distributed feedback Bragg grating laser on the wavelength is larger than that of an injection current, the working temperature of the laser is generally changed to approximately find the gas absorption peak in the peak finding process, and then the driving current range is adjusted to enable the peak position to be exactly in the middle of a scanning line, so that the subsequent concentration calculation and the concentration measurement accuracy are convenient to ensure. In the related art, a hardware PID (proportional-integral-derivative) is proposed to control the temperature of the laser, so as to achieve the purposes of changing the working temperature of the laser and searching for an absorption peak.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the first purpose of the invention is to provide an automatic peak searching method of a laser. The method does not need manual operation, can realize automatic peak searching, and has high peak searching accuracy.
A second object of the invention is to propose a computer-readable storage medium.
A third object of the present invention is to provide a gas concentration detection system.
In order to achieve the above object, an automatic peak searching method for a laser according to an embodiment of a first aspect of the present invention is applied to a gas concentration detection system, where the gas concentration detection system includes a laser, a gas absorption cell, and a photodetector, and a laser signal emitted by the laser passes through the gas absorption cell to the photodetector, and the method includes: initializing the working temperature of the laser; collecting absorption waveform data detected by the photoelectric detector, and judging whether an absorption peak exists according to the absorption waveform data; if yes, calculating a difference value between the position of an absorption peak and the central position of the absorption waveform data; and adjusting the bias current and/or the working temperature of the laser according to the difference, and returning to the step of collecting the absorption waveform data detected by the photoelectric detector until the difference is smaller than a preset difference threshold.
In addition, the automatic peak searching method of the laser device in the embodiment of the invention can also have the following additional technical characteristics:
according to an embodiment of the invention, the method further comprises: and if no absorption peak exists, adjusting the working temperature of the laser, and returning to the step of collecting the absorption waveform data detected by the photoelectric detector.
According to an embodiment of the invention, said adjusting the operating temperature of said laser comprises: if the initialization temperature is the minimum temperature in the effective working temperature range, increasing the working temperature of the laser by a preset temperature; and if the initialization temperature is the maximum temperature in the effective working temperature range, reducing the working temperature of the laser by a preset temperature.
According to one embodiment of the invention, the preset temperature is determined according to a temperature tuning rate, a current tuning rate and a current tuning range of the laser.
According to an embodiment of the invention, said adjusting the bias current and/or the operating temperature of said laser according to said difference comprises: if the difference is less than 0, increasing the bias current of the laser, and/or reducing the working temperature of the laser; if the difference is greater than 0, reducing the bias current of the laser, and/or increasing the working temperature of the laser.
According to an embodiment of the invention, the amount of increase or decrease of the bias current and/or the amount of increase or decrease of the operating temperature is obtained by PID-adjusting the difference value.
To achieve the above object, a computer-readable storage medium is provided in an embodiment of the second aspect of the present invention, on which a computer program is stored, and the computer program, when executed by a processor, implements the automatic peak-finding method for a gas detection laser according to an embodiment of the first aspect of the present invention.
In order to achieve the above object, a gas concentration detecting system according to an embodiment of a third aspect of the present invention includes: the control device is respectively connected with the laser and the photoelectric detector and used for: initializing the working temperature of the laser; collecting absorption waveform data detected by the photoelectric detector, and judging whether an absorption peak exists according to the absorption waveform data; if yes, calculating a difference value between the position of an absorption peak and the central position of the absorption waveform data; and adjusting the bias current and/or the working temperature of the laser according to the difference, and returning to the step of collecting the absorption waveform data detected by the photoelectric detector until the difference is smaller than a preset difference threshold.
In addition, the gas concentration detection system of the embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the present invention, the control device includes: temperature control circuit, acquisition circuit, drive circuit, transconductance circuit and microprocessor, temperature control circuit, acquisition circuit and drive circuit equally divide do not with the laser with microprocessor connects, transconductance circuit respectively with photodetector with microprocessor connects, wherein, microprocessor is used for passing through acquisition circuit acquires the operating temperature of laser, through temperature control circuit adjusts the operating temperature of laser, through drive circuit adjusts the bias current of laser, through transconductance circuit will the photocurrent signal conversion that photodetector gathered obtains the absorption waveform data.
According to the automatic peak searching method of the laser, the storage medium and the gas concentration detection system, the bias current and/or the working temperature of the laser are/is expanded and adjusted according to the relation between the position of the absorption peak and the central position of the absorption waveform data, so that the difference value between the position of the absorption peak and the central position of the absorption waveform data is smaller than the preset difference value threshold, the automatic peak searching of the laser is realized, the peak searching method can avoid the problems of large peak searching error, unstable peak searching and the like caused by manual peak searching in the related technology, and the consistency of the peak searching and calibrating work of the laser is ensured.
Additional aspects and advantages 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 foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a gas concentration detection system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an automatic peak searching method for a laser according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of step S104 in the automatic peak searching method of the laser according to the embodiment of the invention;
FIG. 4 is a schematic illustration of laser operating temperature and bias current adjustment direction for one example of the present invention;
FIG. 5 is a schematic structural diagram of a computer-readable storage medium according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the gas concentration detection system of one embodiment of the present invention;
fig. 7 is a schematic structural diagram of a gas concentration detection system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An automatic peak finding method of a laser, a storage medium, and a gas concentration detection system according to embodiments of the present invention are described below with reference to the drawings.
It should be noted that the automatic peak searching method of the laser provided in the embodiment of the present invention is applied to a gas concentration detection system. As shown in fig. 1, a gas concentration detection system 100 according to an embodiment of the present invention includes a laser 102, a gas absorption cell 103, and a photodetector 104, where a laser signal emitted from the laser 102 passes through the gas absorption cell 103 to the photodetector 104.
Optionally, the Laser in the embodiment of the present invention is selected as a DFB (distributed feedback Laser), wherein the gas absorption cell 103 adopts an open design to ensure that the gas to be measured can flow freely in the gas cavity of the gas absorption cell 103, and two infrared reflection mirrors vertically arranged in opposite directions are arranged at the top of the gas absorption cell 103, so that the Laser radiation signal can be transmitted to the photodetector 104 through the gas absorption cell 103. It should be noted that, in the DFB laser used in this embodiment, the TEC cooling plate and the thermistor are packaged inside, and the center wavelength is near 1653.72 nm, such a laser 102 can change the position of the center wavelength by changing the temperature and the current, and for the embodiment of the present invention, the excitation wavelength can be tuned by adjusting the temperature and the current, so as to perform the automatic peak searching of the laser 102 in the embodiment of the present invention.
Optionally, the photodetector 104 used in the embodiment of the present invention may be a detector with a detection wavelength range of 900-1700 nm and an effective detection surface diameter of 1000 μm. It should be noted that the type of the photodetector 104 shown here is merely exemplary, and the specific application can be adapted according to the actual needs and application scenarios, and is not limited in the embodiments of the present invention.
Fig. 2 is a schematic flow chart of an automatic peak searching method of a laser according to an embodiment of the present invention.
As shown in fig. 2, in some embodiments, an automatic peak-finding method of a laser may include:
and S101, initializing the working temperature of the laser.
It should be understood that the initialization operating temperature of the laser here is determined by the effective operating temperature of the laser 102, that is, it is required to ensure that the laser 102 can normally emit the laser signal at the initialization operating temperature.
As a possible implementation, the initialization temperature of the laser is the maximum or minimum temperature within the range of the effective operating temperature of the laser 102.
Illustratively, for the DFB laser, the effective operating temperature is 10 ℃ to 50 ℃, so when step S101 is executed, the initialization temperature of the laser can be set to 10 ℃ as the minimum temperature, or 50 ℃ as the maximum temperature, to ensure that the DFB laser can normally emit the laser signal at the corresponding initialization temperature.
S102, collecting absorption waveform data detected by the photoelectric detector, and judging whether an absorption peak exists according to the absorption waveform data.
It should be understood that, after detecting the laser signal emitted by the laser 102, the photodetector 104 may collect and convert the laser signal into a photocurrent signal, and further convert the photocurrent signal into a voltage signal, and collect the voltage signal to obtain the absorption waveform data in the embodiment of the present invention.
In some embodiments, when it is determined whether there is an absorption peak according to the absorption waveform data, it may be observed whether there is a position in all data correspondingly collected in the absorption waveform data, and whether voltage values of all data on the left and right sides of the position are both smaller than a voltage value corresponding to the position, if so, it is determined that there is an absorption peak in the absorption waveform data, and if not, it is determined that there is no absorption peak in the absorption waveform data. It should be noted that the method for determining whether there is an absorption peak in the absorption waveform data shown above is merely an example, and other determination manners may be selected according to historical experience or actual needs in specific applications, and are not limited in the embodiment of the present invention.
S103, if yes, calculating a difference between the absorption peak position and the center position of the absorption waveform data.
Specifically, since the absorption waveform data includes a plurality of sets of data corresponding to a plurality of acquired positions, when it is determined that an absorption peak exists in the absorption waveform data, it is necessary to determine a relationship between the position of the absorption peak and the central position of the absorption waveform data, and determine a difference between the position of the absorption peak and the central position of the absorption waveform data, so as to facilitate subsequent corresponding adjustment according to the difference.
And S104, adjusting the bias current and/or the working temperature of the laser according to the difference, and returning to the step of collecting the absorption waveform data detected by the photoelectric detector until the difference is smaller than a preset difference threshold.
Specifically, after determining the difference between the absorption peak position and the center position of the absorption waveform data, it may be determined whether the difference is smaller than a preset difference threshold, and if the difference is larger than the preset difference threshold, the bias current and/or the operating temperature of the laser 102 may be adjusted according to the difference to reduce the difference between the absorption peak position and the center position of the absorption waveform data, so that the laser may automatically find the peak even if the absorption peak position is continuously close to the center position of the absorption waveform data.
The preset difference threshold may be selected according to actual conditions, and is not particularly limited in the embodiment of the present invention. For example, if the acquired absorption waveform data includes 100 acquisition points, and the center position of the absorption waveform data is a position corresponding to 50 points, if the preset difference threshold is 2, when it is determined that the absorption peak position is within the 48 th point to the 52 th point in the absorption waveform data, it can be regarded that the difference between the absorption peak position and the center position of the absorption waveform data is smaller than the preset threshold.
Compared with the peak searching method through manual operation and manual observation in the related art, the automatic peak searching method for the laser provided by the embodiment of the invention can be used for performing expansion adjustment on the bias current and/or the working temperature of the laser 102 according to the relation between the position of the absorption peak and the central position of the absorption waveform data, so that the difference between the position of the absorption peak and the central position of the absorption waveform data is smaller than the preset difference threshold, and the automatic peak searching of the laser is realized. The peak searching method can avoid the problems of large peak searching error, unstable peak searching and the like caused by manual peak searching in the related technology, and ensure the consistency of the peak searching and calibrating work of the laser.
Further, in other embodiments of the present invention, if it is determined that there is no absorption peak in the absorption waveform data, the automatic peak searching method for a laser in this embodiment may further include:
and S105, if the absorption peak does not exist, adjusting the working temperature of the laser, and returning to the step of collecting the absorption waveform data detected by the photoelectric detector.
Specifically, when it is determined from the absorption waveform data that no absorption peak exists therein, since the absorption waveform data is derived from the waveform signal emitted by the laser 102, adjustment can be made for the laser 102 so that an absorption peak exists in the absorption waveform data detected by the photodetector 104. Optionally, since the wavelength of the laser signal emitted by the laser 102 is related to the operating temperature, the operating temperature of the laser 102 is adjusted to change the output wavelength of the laser 102, so that the adjustment of the operating temperature of the laser 102 can be stopped when an absorption peak exists in the collected absorption waveform data.
As a possible implementation, when no absorption peak is present in the absorption waveform data, the operating temperature of the laser 102 needs to be adjusted so that an absorption peak appears in the absorption waveform data. Optionally, if the initialization temperature is the minimum temperature within the effective operating temperature range, increasing the operating temperature of the laser 102 by a preset temperature; if the initialization temperature is the maximum temperature within the effective operating temperature range, the operating temperature of the laser 102 is reduced by a preset temperature.
In particular, upon initializing the operating temperature of the laser 102, subsequent conditioning processes may be correspondingly different when the selected initialization temperature is different. It can be understood that, since the laser 102 emits the laser signal only when the laser 102 is within the corresponding operating temperature, if the initialization temperature of the laser 102 is the minimum temperature within the effective operating temperature range, the preset temperature needs to be increased on the basis of the minimum temperature when the adjustment operation is performed; if the laser 102 initialization temperature is the maximum temperature within the effective operating temperature range, the preset temperature needs to be reduced based on the maximum temperature during the adjustment operation.
It can be understood that, when the operating temperature of the laser 102 is adjusted, since the laser 102 according to the embodiment of the present invention has the thermistor enclosed therein, the operating temperature of the laser 102 can be determined according to the resistance of the thermistor. The mode of determining the operating temperature of the laser 102 according to the resistance value of the thermistor may be selected according to actual conditions in specific applications, and may be according to a table look-up method or a formula method, which is not limited in this embodiment of the present invention.
As a possible implementation, the preset temperature is determined according to the temperature tuning rate, the current tuning rate, and the current tuning range of the laser 102.
For example, if the initialization temperature of the laser in this embodiment is the minimum temperature within the effective operating temperature range, taking 10 ℃ as an example, since the general temperature tuning rate is 0.1 nm/° c, and the current tuning rate is 0.01 nm/mA, if the current tuning range is 20mA to 60mA, the current tuning range is equivalent to the operating temperature of the laser 102, which is equivalent to 4 ℃ of scanning, in order to avoid scanning omission, the temperature adjustment step size may be set to 4 ℃, that is, 4 ℃ is added on the basis of the initialization temperature of the laser 102 of 10 ℃, and then the process is cycled until an absorption peak appears in the absorption waveform collected at the corresponding temperature.
As shown in fig. 3, as a possible implementation manner, the adjusting the bias current and/or the operating temperature of the laser according to the difference in the automatic peak searching method of the laser according to the above embodiment may include:
and S201, if the difference is smaller than 0, increasing the bias current of the laser, and/or reducing the working temperature of the laser.
And S202, if the difference is larger than 0, reducing the bias current of the laser and/or increasing the working temperature of the laser.
Fig. 4 is a schematic diagram of laser operating temperature and bias current adjustment direction according to an example of the present invention. Referring to fig. 4, the abscissa is the number of collected points of the collected absorption waveform data, the ordinate is the photovoltaic voltage, in the figure, a and b are the positions of two absorption peaks, respectively, and c is the central position of the absorption waveform data, when the position of the absorption peak is a, that is, the position of the absorption peak is shifted to the left relative to the middle position, that is, when the difference between the position of the absorption peak and the central position of the absorption waveform data is less than 0, the position of the absorption peak can be adjusted toward the central position of the absorption waveform data by increasing the bias current of the laser 102 and/or decreasing the operating temperature of the laser 102; when the absorption peak position is b, that is, the absorption peak position is shifted to the right with respect to the middle position, that is, the difference between the absorption peak position and the center position of the absorption waveform data is greater than 0, the absorption peak position may be adjusted toward the center position of the absorption waveform data by decreasing the bias current of the laser 102 and/or increasing the operating temperature of the laser 102.
In the present embodiment, the increase/decrease amount of the bias current and/or the increase/decrease amount of the operating temperature are obtained by PID-adjusting the difference values.
Specifically, when the bias current and/or the operating temperature of the laser 102 are/is adjusted according to the difference between the absorption peak position and the center position of the absorption waveform data, the difference can be used as an error input, the required adjustment is calculated through incremental PID, the output quantity corresponds to the increase and decrease quantity of the bias current and/or the increase and decrease quantity of the operating temperature according to the embodiment of the present invention, and then the absorption waveform data are continuously collected until the difference between the absorption peak position and the center position of the absorption waveform data is smaller than the preset difference, so that the automatic peak searching of the laser is realized.
According to the automatic peak searching method of the laser, when no absorption peak exists in absorption waveform data, the working temperature of the laser 102 is adjusted, so that the absorption peak exists in the acquired absorption waveform data, after the absorption peak appears, the increase and decrease of the bias current and/or the working temperature of the laser 102 are determined according to the difference value between the position of the absorption peak and the central position of the absorption waveform data and PID adjustment, so that the position of the absorption peak is moved to the central position of the absorption waveform data, and the automatic peak searching is realized.
Further, an embodiment of the present invention provides a computer-readable storage medium.
As shown in fig. 5, a computer readable storage medium 200 of the embodiment of the present invention has a computer program 202 stored thereon, and when the computer program 202 is executed by a processor, the automatic peak finding method of the gas detection laser according to the above-mentioned embodiment of the present invention is implemented.
Further, the embodiment of the invention provides a gas concentration detection system.
As shown in fig. 6, a gas concentration detection system 100 according to an embodiment of the present invention includes a control device 101, a laser 102, a gas absorption cell 103, and a photodetector 104, wherein a laser signal emitted by the laser 102 passes through the gas absorption cell 103 to the photodetector 104, and the control device 101 is respectively connected to the laser 102 and the photodetector 104, and is configured to: initializing the operating temperature of the laser 102; collecting absorption waveform data detected by the photoelectric detector 104, and judging whether an absorption peak exists according to the absorption waveform data; if so, calculating a difference value between the position of the absorption peak and the central position of the absorption waveform data; and adjusting the bias current and/or the working temperature of the laser 102 according to the difference, and returning to the step of collecting the absorption waveform data detected by the photoelectric detector 104 until the difference is smaller than a preset difference threshold.
As a possible implementation, as shown in fig. 7, the control device 101 includes: the temperature control circuit 11, the acquisition circuit 12, the driving circuit 13, the transconductance circuit 14 and the microprocessor 15, the temperature control circuit 11, the acquisition circuit 12 and the driving circuit 13 are respectively connected with the laser 102 and the microprocessor 15, the transconductance circuit 14 is respectively connected with the photoelectric detector 104 and the microprocessor 15, wherein the microprocessor 15 is used for acquiring the working temperature of the laser 102 through the acquisition circuit 12, adjusting the working temperature of the laser 102 through the temperature control circuit 11, adjusting the bias current of the laser 102 through the driving circuit 13, and converting the photocurrent signal acquired by the photoelectric detector 104 into a voltage signal through the transconductance circuit 14 to obtain absorption waveform data.
Optionally, in this implementation, the medium temperature control circuit 11 uses an ADN8834 TEC controller chip as a core.
It should be noted that other configurations and functions of the gas concentration detection system according to the embodiment of the present invention are known to those skilled in the art, and are not described herein for reducing redundancy.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. An automatic peak searching method for a laser is applied to a gas concentration detection system, the gas concentration detection system comprises a laser, a gas absorption cell and a photoelectric detector, a laser signal emitted by the laser passes through the gas absorption cell to the photoelectric detector, and the method comprises the following steps:
initializing the working temperature of the laser;
collecting absorption waveform data detected by the photoelectric detector, and judging whether an absorption peak exists according to the absorption waveform data;
if so, calculating a difference value between the position of the absorption peak and the central position of the absorption waveform data;
and adjusting the bias current and/or the working temperature of the laser according to the difference, and returning to the step of collecting the absorption waveform data detected by the photoelectric detector until the difference is smaller than a preset difference threshold.
2. The method of claim 1, further comprising:
and if the absorption peak does not exist, adjusting the working temperature of the laser, and returning to the step of collecting the absorption waveform data detected by the photoelectric detector.
3. The method according to claim 2, wherein the initialization temperature of the laser is a maximum temperature or a minimum temperature within an effective operating temperature range of the laser.
4. The method of claim 3, wherein the adjusting the operating temperature of the laser comprises:
if the initialization temperature is the minimum temperature in the effective working temperature range, increasing the working temperature of the laser by a preset temperature;
and if the initialization temperature is the maximum temperature in the effective working temperature range, reducing the working temperature of the laser by a preset temperature.
5. The method according to claim 4, wherein the preset temperature is determined according to a temperature tuning rate, a current tuning rate and a current tuning range of the laser.
6. The method according to claim 1, wherein the adjusting the bias current and/or the operating temperature of the laser according to the difference comprises:
if the difference is less than 0, increasing the bias current of the laser, and/or reducing the working temperature of the laser;
if the difference is greater than 0, reducing the bias current of the laser, and/or increasing the working temperature of the laser.
7. The automatic peak-finding method of laser device according to claim 6, wherein the increase and decrease of the bias current and/or the increase and decrease of the operating temperature are obtained by performing PID adjustment on the difference.
8. A computer-readable storage medium on which a computer program is stored, wherein the computer program, when executed by a processor, implements the gas detection laser auto-peak finding method according to any one of claims 1-7.
9. A gas concentration detection system, the system comprising: the control device is respectively connected with the laser and the photoelectric detector and used for:
initializing the working temperature of the laser;
collecting absorption waveform data detected by the photoelectric detector, and judging whether an absorption peak exists according to the absorption waveform data;
if so, calculating a difference value between the position of the absorption peak and the central position of the absorption waveform data;
and adjusting the bias current and/or the working temperature of the laser according to the difference, and returning to the step of collecting the absorption waveform data detected by the photoelectric detector until the difference is smaller than a preset difference threshold.
10. The gas concentration detection system according to claim 9, wherein the control device includes: the temperature control circuit, the acquisition circuit and the driving circuit are respectively connected with the laser and the microprocessor, the transconductance circuit is respectively connected with the photoelectric detector and the microprocessor, wherein,
the microprocessor is used for acquiring the working temperature of the laser through the acquisition circuit, adjusting the working temperature of the laser through the temperature control circuit, adjusting the bias current of the laser through the driving circuit, and converting the photocurrent signal acquired by the photoelectric detector into a voltage signal through the transconductance circuit to obtain the absorption waveform data.
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