CN109596565B - Device and method for realizing self-stabilization of received light intensity based on laser array - Google Patents
Device and method for realizing self-stabilization of received light intensity based on laser array Download PDFInfo
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- CN109596565B CN109596565B CN201811190623.4A CN201811190623A CN109596565B CN 109596565 B CN109596565 B CN 109596565B CN 201811190623 A CN201811190623 A CN 201811190623A CN 109596565 B CN109596565 B CN 109596565B
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Abstract
The invention provides a device and a method for realizing self-stabilization of received light intensity based on a laser array, wherein the device comprises the laser array, the laser array is composed of a plurality of laser array elements, and the laser emitted by each laser array element has the same wavelength and the same propagation direction; the array beam detector is used for receiving the array beam emitted by the laser array and transmitting the amplitude of the received optical signal to the master controller; and the master controller is used for acquiring the difference value between the received optical signal amplitude and the optical signal amplitude standard value and controlling the on-off of each laser array element in the laser array according to the difference value. Compared with the prior art which needs to rely on mechanical moving parts, the invention has the advantages of quick response and long service life, and in the self-stabilization process of the received light intensity, the performance of the optical receiving system can not be changed, and the external stray light can not be increased.
Description
Technical Field
The invention relates to the technical field of laser telemetering, in particular to a device and a method for realizing self-stabilization of received light intensity based on a laser array.
Background
TDLAS is short for Tunable Diode Laser Absorption Spectroscopy, and the technology mainly utilizes the characteristics that the narrow line width and the wavelength of a Tunable semiconductor Laser are changed along with the injection current to realize the measurement of single or a plurality of Absorption lines of molecules which are very close to each other and difficult to distinguish. In the practical application process of the TDLAS, the intensity of the laser light received by the detector is greatly changed due to the influence of many factors such as the reflectivity of the reflecting surface, the laser propagation distance, the included angle between the laser and the reflecting surface, and the like. In the prior art, two technical schemes are mainly adopted to solve the technical problem that the intensity of laser light received by a detector is unstable:
(1) the aperture of the optical receiver of the detector is adjusted by using the diaphragm, so that signal distortion caused by overhigh laser intensity is avoided. However, when the aperture is enlarged, the intensity of external stray light is also increased, which affects the performance of the detector. And because the diaphragm is driven by a motor to adjust the clear aperture of the diaphragm, the diaphragm cannot be quickly adjusted and the service life of the diaphragm is short due to mechanical abrasion.
(2) And the exposure time of the detector is adjusted, so that the signal-to-noise ratio of a signal caused by too small light intensity received by the detector is avoided being lower. However, adjusting the exposure time of the detector will affect the response speed of the measuring device, for example, extending the exposure time will result in a slower response speed. And if the detector saturation distortion is generated due to the overlarge intensity of the received laser light, the problem of signal distortion cannot be solved even if the exposure time of the detector is adjusted.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides an apparatus and method for realizing self-stabilization of received light intensity based on a laser array.
The invention is realized by the following technical scheme:
in a first aspect, an apparatus for achieving self-stabilization of received light intensity based on a laser array includes:
the laser array is composed of a plurality of laser array elements, and the laser emitted by each laser array element has the same wavelength and the same propagation direction;
the array beam detector is used for receiving the array beams emitted by the laser array and transmitting the received optical signal amplitude to the master controller;
and the master controller is used for acquiring the difference value between the received optical signal amplitude and the optical signal amplitude standard value and controlling the on-off of each laser array element in the laser array according to the difference value.
In a second aspect, a method for achieving self-stabilization of received light intensity based on a laser array is implemented by an apparatus for achieving self-stabilization of received light intensity based on a laser array as described above, and includes:
the master controller controls the laser array to emit array beams, and the array beams are composed of laser beams with the same wavelength and the same propagation direction;
the array light beam detector receives the array light beam emitted by the laser array and transmits the amplitude of the received optical signal to the master controller;
and the master controller acquires the difference value between the amplitude of the received optical signal and the standard value of the amplitude of the optical signal and controls the on-off of each laser array element in the laser array according to the difference value.
The invention has the beneficial effects that:
the device and the method for realizing the self-stabilization of the received light intensity based on the laser array have the following beneficial effects that:
in the embodiment of the invention, the master controller controls the starting number of the laser array elements in the laser array by analyzing the difference between the amplitude of the optical signal received by the array beam detector and the standard value of the amplitude of the optical signal, so as to finally realize the adjustment of the total output optical power, and adjusts the laser array based on the difference between the amplitude of the optical signal and the standard value of the amplitude of the optical signal, thereby generating a control closed loop. Compared with the prior art which needs to rely on mechanical moving parts, the optical receiving system has the advantages of quick response and long service life, and in the self-stabilization process of the received light intensity, the performance of the optical receiving system cannot be changed, and external stray light cannot be increased, so that the optical signal received by the array beam detector has higher signal-to-noise ratio.
Drawings
FIG. 1 is a schematic diagram of an apparatus for achieving self-stabilization of received light intensity based on a laser array according to the present invention;
FIG. 2 is a flow chart of a method for achieving self-stabilization of received light intensity based on a laser array according to the present invention;
fig. 3(1) is a schematic diagram of a first laser array element according to an embodiment of the present invention;
fig. 3(2) is a schematic diagram of a second laser array element according to an embodiment of the present invention;
FIG. 4 is a block diagram of a controller provided by an embodiment of the present invention;
FIG. 5(1) is a schematic diagram of an optical signal after passing through a gas absorption cell according to an embodiment of the present invention;
FIG. 5(2) is a schematic diagram of an optical signal without gas absorption according to an embodiment of the present invention;
FIG. 6 is a block diagram of a current driver provided by an embodiment of the invention;
FIG. 7 is a block diagram of a temperature controller provided by an embodiment of the present invention;
fig. 8 is a flowchart of a laser array element control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention provides a device for realizing self-stabilization of received light intensity based on a laser array, as shown in figure 1, the device comprises:
the laser array is composed of a plurality of laser array elements, and laser emitted by each laser array element has the same wavelength and the same propagation direction.
And the array beam detector is used for receiving the array beams emitted by the laser array and transmitting the amplitude of the received optical signal to the master controller.
And the master controller is used for acquiring the difference value between the received optical signal amplitude and the optical signal amplitude standard value and controlling the on-off of each laser array element in the laser array according to the difference value.
Specifically, the array beam detector can convert the received light intensity signal of the array beam into an electrical signal, namely, an optical signal amplitude, and transmit the obtained optical signal amplitude to the master controller in the form of the electrical signal.
Specifically, if the difference is a positive number and is greater than a first threshold, closing a plurality of laser array elements; and if the difference is a negative number and the absolute value is greater than a second threshold value, starting a plurality of laser array elements.
In fact, the first threshold, the second threshold, and the optical signal amplitude may be set according to actual conditions, where the optical signal amplitude plus the first threshold forms an upper limit of a feasible optical signal receiving interval, and the optical signal amplitude minus the second threshold forms a lower limit of the feasible optical signal receiving interval, where the feasible optical signal receiving interval is a parameter related to the array beam detector. In the feasible receiving interval of the optical signal, the received optical signal has low noise and high signal-to-noise ratio, and the phenomenon of overexposure or underexposure cannot occur. The feasible receiving interval of the optical signal is directly related to the actual circuit structure of the array beam detector.
To simplify control, the amplitudes of the laser light output by the individual laser array elements may be equal.
The embodiment of the invention discloses a device for realizing self-stabilization of received light intensity based on a laser array, which realizes the stabilization of the received light intensity of an array beam detector by controlling the total output light power of the laser array. The method specifically comprises the steps that a master controller controls the starting number of laser array elements in a laser array by analyzing the difference between an optical signal amplitude value received by an array beam detector and an optical signal amplitude value standard value, and further the adjustment of the total output optical power is finally realized. The embodiment of the invention adjusts the laser array based on the difference between the optical signal amplitude and the optical signal amplitude standard value, thereby generating a control closed loop.
The embodiment of the invention can realize the self-stabilization of the received light intensity only by controlling the opening and closing of the laser array element, has the advantages of quick response and long service life compared with the prior art which needs to rely on mechanical moving parts, does not change the performance of an optical receiving system and increase external stray light in the self-stabilization process of the received light intensity, and thus ensures that the optical signal received by the array beam detector has higher signal-to-noise ratio.
Another embodiment of the present invention provides a method for realizing self-stabilization of received light intensity based on a laser array, as shown in fig. 2, including:
s101, the master controller controls the laser array to emit array light beams, and the array light beams are composed of laser light beams with the same wavelength and the same transmission direction.
And S102, receiving the array light beam emitted by the laser array by the array light beam detector, and transmitting the received optical signal amplitude to the master controller.
And S103, the master controller acquires the difference value between the received optical signal amplitude and the optical signal amplitude standard value, and controls the on-off of each laser array element in the laser array according to the difference value.
Specifically, if the difference is a positive number and is greater than a first threshold, closing a plurality of laser array elements; and if the difference is a negative number and the absolute value is greater than a second threshold value, starting a plurality of laser array elements.
The embodiment of the invention is based on the fact that the laser array capable of forming the array beam is provided, and the array beam is composed of laser beams with the same wavelength and consistent propagation directions. For this reason, the embodiment of the present invention discloses a laser array element capable of strictly controlling a wavelength, where the laser array element is as shown in fig. 3(1) and fig. 3(2), and includes a laser, and the laser array element further includes:
the light splitting component is arranged on an emergent light path of the laser and splits laser emitted by the laser into detection light and reference light;
the gas absorption cell is arranged on a light path of the reference light;
a detector for receiving the reference light passing through the gas absorption cell;
a controller connected to the detector;
and the driving module is used for driving the laser according to the driving signal output by the controller.
Specifically, please refer to fig. 3(1), the light splitting component may be a spectroscope, please refer to fig. 3(2), and the light splitting component may also be an optical fiber. When the optical fiber is used as a light splitting component, the laser is split into detection light and reference light by the Y-shaped optical fiber, the detection light is emitted out through the emergent optical fiber, and the reference light is emitted into the gas absorption cell through the reference optical fiber and the optical fiber collimator.
As shown in fig. 4, the controller includes:
the digital sampling module 1 is configured to sample the received electrical signal to obtain a digital signal.
And the absorption peak analysis module 2 is used for acquiring an absorption peak corresponding to the reference light according to the digital signal.
And the offset calculating module 3 is used for comparing the absorption peak corresponding to the reference light with a preset absorption peak to obtain the absorption peak offset.
And the driving signal output module 4 is used for generating a driving signal according to the absorption peak offset and transmitting the driving signal to the driving module.
In the embodiment of the invention, laser emitted by a laser is divided into two beams of laser by a beam splitting component: emergent light and reference light, and a light splitting component is often required to be plated with an antireflection film, so that the light intensity of the emergent light is hundreds of times to thousands of times of that of the reference light. The reference light is used to monitor the wavelength of the outgoing light. After the reference light passes through the gas absorption cell, the light with specific wavelength can be selectively absorbed by the gas, and the reference light carrying the gas absorption information is received by the detector.
The detector converts the light intensity signal into an electric signal to be transmitted to the controller, the controller can collect the electric signal into a data signal after receiving an external trigger signal, and then the data signal is analyzed, so that the position and the offset of an absorption peak are determined, a driving signal is obtained, and the feedback control of laser emitted from the laser is realized.
Specifically, the included angle between the normal of an optical window of the gas absorption cell and the optical axis of the laser is 5-45 degrees; the included angle between the normal of the photosensitive surface of the detector and the optical axis of the laser is 5-45 degrees.
Fig. 5(1) shows the optical signal after passing through the gas absorption cell, and fig. 5(2) shows the optical signal without gas absorption. The optical signal after gas absorption is directly detected by a detector, the optical signal without gas absorption can be obtained by direct detection or data fitting, and the optical signal without gas absorption and the optical signal after gas absorption are compared to obtain a gas absorption peak signal, so that the position of an absorption peak is obtained.
In a feasible implementation manner, derivation can also be performed on the optical signal after gas absorption, so that laser intensity information in the optical intensity signal is eliminated, a harmonic signal of a gas absorption peak signal is obtained, and the position of the gas absorption peak can be directly obtained through a peak searching or zero point algorithm. If the gas concentration is measured by adopting a harmonic method, the harmonic signal of the gas absorption signal can be obtained by performing phase-locked amplification on the optical signal after gas absorption, and the position of the gas absorption peak is directly obtained by a peak-finding or zero algorithm.
The controller in the embodiment of the invention enables the position of the absorption peak to be close to the preset position based on the feedback control principle until the offset of the absorption peak is small enough to meet the requirement of accurate control on the wavelength of the laser array element. Correspondingly, in the laser array formed by the laser array elements, the preset absorption peak position of the reference light is adjusted to be consistent by each laser array element by utilizing the process, so that the wavelength of the emergent light is kept consistent, and the aim of obtaining the array light beam formed by the laser light beams with the same wavelength and the consistent propagation direction by utilizing the laser array is fulfilled.
In one possible embodiment, the controller may perform feedback control by converting the absorption peak offset into a laser drive current dc offset.
Specifically, the driving module includes a current driver for inputting a laser driving current to the laser.
The driving signal output module includes:
the first driving signal output unit is used for calculating a direct current offset according to the absorption peak offset and outputting the direct current offset to the current driver;
as shown in fig. 6, the current driver includes:
an external input unit 10 for acquiring an external driving signal.
And an offset signal input unit 20 for obtaining a dc offset.
And a driving current output unit 30, configured to obtain a laser driving current according to the external driving signal and the dc offset, and output the laser driving current to the laser.
In the embodiment, the current driver adds a dc offset to the external drive signal and then converts the added signal into the drive current of the laser. Therefore, the external driving current can realize the wavelength scanning of the laser within a certain wavelength range, and the direct current offset can adjust the wavelength scanning position, so that the position adjustment of an absorption peak is realized through the direct current offset, and the stability of the wavelength of the laser emitted by the laser is ensured.
In another possible embodiment, the controller may perform feedback control by converting the absorption peak offset to a laser temperature set point.
The driving module comprises a temperature controller, and the temperature controller is used for inputting temperature control current to the laser.
The driving signal output module includes:
and the second driving signal output unit is used for calculating a temperature set value according to the absorption peak offset and outputting the temperature set value to the temperature controller.
As shown in fig. 7, the temperature controller includes:
a temperature setting unit 100 for acquiring a temperature setting value output by the second driving signal output unit;
and the temperature control current output unit 200 is used for outputting the temperature control current to the laser according to the temperature set value and the temperature of the laser.
In order to improve the accuracy of the laser temperature control, in one embodiment, the laser further comprises a temperature sensor for acquiring the laser temperature;
the temperature controller further includes a feedback temperature acquisition unit 300 connected to the temperature sensor.
The temperature controller further includes:
a comparator 400 for obtaining a difference between the temperature setting value and the laser temperature;
the temperature control current output unit 200 is further configured to output a temperature control current according to the difference. Specifically, the control manner based on the difference value may be PID or other control manner.
Specifically, the temperature control current output unit may be a TEC temperature control driver, and the TEC temperature control driver outputs a TEC driving current to the laser.
In the embodiment, the temperature controller may feed back the current temperature of the laser through the temperature sensor, and control the temperature of the laser by changing the TEC driving current. Therefore, the wavelength of the laser can be changed by changing the temperature of the laser, and the position of the absorption peak can be adjusted in the same way, so that the stability of the wavelength of the laser emitted by the laser is ensured.
In another possible embodiment, the controller can adaptively select different feedback control modes according to actual conditions.
Specifically, the driving module includes:
a current driver for inputting a laser driving current to the laser;
the temperature controller is used for inputting temperature control current to the laser;
the driving signal output module includes:
the first driving signal output unit is used for calculating a direct current offset according to the absorption peak offset and outputting the direct current offset to the current driver;
the second driving signal output unit is used for calculating a temperature set value according to the absorption peak offset and outputting the temperature set value to the temperature controller;
and the comparison unit is used for judging and starting the first driving signal output unit and/or the second driving signal output unit according to the absorption peak offset.
In the embodiment, the controller may use different feedback control paths according to different adaptive choices of absorption peak offsets. In one possible embodiment, when the offset is small, the position of the absorption peak is adjusted by increasing/decreasing the dc offset component of the driving current; when the offset is large, the position of the absorption peak is adjusted by adjusting the temperature of the laser.
Further, for the laser array in the embodiment of the present invention, each laser array element constitutes an independently acting module of the laser array, and the modular design can maximally reduce the coupling degree of the array. Furthermore, each laser array element can independently and accurately modulate the wavelength of laser in a mode of changing temperature and/or changing driving current, and can meet the requirement of narrow line width, so that the laser performance of each laser in the laser array is good, the wavelengths are strictly consistent, and the performance of the laser array is ensured. Of course, the laser array can obtain any high-power laser by increasing the number of lasers.
Another embodiment of the present invention provides a method for controlling a laser array element, as shown in fig. 8, including:
s1, acquiring a digital signal of reference light passing through a gas absorption cell.
And S2, acquiring an absorption peak corresponding to the reference light according to the digital signal.
And S3, comparing the absorption peak corresponding to the reference light with a preset absorption peak to obtain the absorption peak offset.
And S4, generating a driving signal according to the absorption peak offset.
And S5, driving the laser according to the driving signal.
In one possible embodiment, the generating the driving signal according to the absorption peak offset includes: calculating direct current offset according to the absorption peak offset;
correspondingly, the driving the laser according to the driving signal output by the controller comprises:
acquiring an external driving signal;
acquiring the direct current offset;
and obtaining laser driving current according to the external driving signal and the direct current offset, and outputting the laser driving current to the laser.
In another possible embodiment, the generating a driving signal according to the absorption peak offset includes: calculating a temperature set value according to the absorption peak offset;
correspondingly, the driving the laser according to the driving signal output by the controller comprises:
acquiring the temperature set value;
and outputting temperature control current to the laser according to the temperature set value and the temperature of the laser.
Of course, these two embodiments can be used separately or superimposed.
The embodiment of the method and the embodiment of the device are based on the same inventive concept, and the embodiment of the device is specifically shown in detail.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that although embodiments described herein include some features included in other embodiments, not other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
The present invention may also be embodied as apparatus or system programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps or the like not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering and these words may be interpreted as names.
Claims (8)
1. An apparatus for realizing self-stabilization of received light intensity based on a laser array, comprising: the laser array is composed of a plurality of laser array elements, and the laser emitted by each laser array element has the same wavelength and the same propagation direction; the array beam detector is used for receiving the array beams emitted by the laser array and transmitting the received optical signal amplitude to the master controller; the master controller is used for acquiring the difference value between the amplitude value of the received optical signal and the standard value of the amplitude value of the optical signal and controlling the on-off of each laser array element in the laser array according to the difference value; if the difference is positive and greater than a first threshold value, closing the plurality of laser array elements; if the difference is a negative number and the absolute value is greater than a second threshold value, starting a plurality of laser array elements;
the laser array element comprises a laser and further comprises: the light splitting component is arranged on an emergent light path of the laser and splits laser emitted by the laser into detection light and reference light; the gas absorption cell is arranged on a light path of the reference light; a detector for receiving the reference light passing through the gas absorption cell; a controller connected to the detector; the driving module is used for driving the laser according to the driving signal output by the controller; the controller includes: the digital sampling module is used for sampling the received electric signals to obtain digital signals; the absorption peak analysis module is used for acquiring an absorption peak corresponding to the reference light according to the digital signal; the offset calculation module is used for comparing an absorption peak corresponding to the reference light with a preset absorption peak to obtain an absorption peak offset; and the driving signal output module is used for generating a driving signal according to the absorption peak offset and transmitting the driving signal to the driving module.
2. The apparatus of claim 1, wherein the apparatus comprises: the driving module comprises a current driver, and the current driver is used for inputting laser driving current to the laser; the driving signal output module includes: the first driving signal output unit is used for calculating a direct current offset according to the absorption peak offset and outputting the direct current offset to the current driver; the current driver includes: an external input unit for acquiring an external driving signal; the bias signal input unit is used for acquiring direct current bias; and the driving current output unit is used for obtaining laser driving current according to the external driving signal and the direct current offset and outputting the laser driving current to the laser.
3. The apparatus of claim 1, wherein the apparatus comprises: the driving module comprises a temperature controller, and the temperature controller is used for inputting temperature control current to the laser; the driving signal output module includes: the second driving signal output unit is used for calculating a temperature set value according to the absorption peak offset and outputting the temperature set value to the temperature controller; the temperature controller includes: the temperature setting unit is used for acquiring a temperature set value output by the second driving signal output unit; and the temperature control current output unit is used for outputting temperature control current to the laser according to the temperature set value and the temperature of the laser.
4. The apparatus of claim 3, wherein the apparatus comprises: the laser also comprises a temperature sensor for acquiring the temperature of the laser; the temperature controller also comprises a feedback temperature acquisition unit, and the feedback temperature acquisition unit is connected with the temperature sensor; the temperature controller further includes: the comparator is used for acquiring the difference value between the temperature set value and the laser temperature; and the temperature control current output unit is also used for outputting temperature control current according to the difference value.
5. The apparatus of claim 4, wherein the apparatus comprises: the temperature control current output unit further comprises a TEC temperature control driver, and the TEC temperature control driver is used for outputting TEC driving current to the laser.
6. The apparatus of claim 1, wherein the apparatus comprises: the driving module includes: a current driver for inputting a laser driving current to the laser; the temperature controller is used for inputting temperature control current to the laser; the driving signal output module includes: the first driving signal output unit is used for calculating a direct current offset according to the absorption peak offset and outputting the direct current offset to the current driver; the second driving signal output unit is used for calculating a temperature set value according to the absorption peak offset and outputting the temperature set value to the temperature controller; and the comparison unit is used for judging and starting the first driving signal output unit and/or the second driving signal output unit according to the absorption peak offset.
7. A method for realizing self-stabilization of received light intensity based on a laser array, which is implemented by the device for realizing self-stabilization of received light intensity based on the laser array as claimed in any one of claims 1 to 6, and comprises the following steps: the master controller controls the laser array to emit array beams, and the array beams are composed of laser beams with the same wavelength and the same propagation direction; the array light beam detector receives the array light beam emitted by the laser array and transmits the amplitude of the received optical signal to the master controller; and the master controller acquires the difference value between the amplitude of the received optical signal and the standard value of the amplitude of the optical signal and controls the on-off of each laser array element in the laser array according to the difference value.
8. The method of claim 7, wherein if the difference is positive and greater than a first threshold, then turning off a plurality of laser array elements; and if the difference is a negative number and the absolute value is greater than a second threshold value, starting a plurality of laser array elements.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110378744.7A CN113092411B (en) | 2018-10-12 | 2018-10-12 | Device and method for realizing self-stabilization of received light intensity based on laser array |
| CN201811190623.4A CN109596565B (en) | 2018-10-12 | 2018-10-12 | Device and method for realizing self-stabilization of received light intensity based on laser array |
| PCT/CN2019/110759 WO2020074000A1 (en) | 2018-10-12 | 2019-10-12 | Laser array element, array, and device for realizing received light intensity self-stabilization on the basis of array |
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| CN201811190623.4A CN109596565B (en) | 2018-10-12 | 2018-10-12 | Device and method for realizing self-stabilization of received light intensity based on laser array |
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| CN115189761B (en) * | 2022-06-29 | 2024-03-22 | 武汉电信器件有限公司 | Intensity modulation direct detection device and method |
| CN115876726B (en) * | 2023-02-02 | 2023-07-18 | 合肥清芯传感科技有限公司 | Automatic peak searching method of laser, storage medium and gas concentration detection system |
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| GB2203891A (en) * | 1987-04-21 | 1988-10-26 | Plessey Co Plc | Semiconductor diode laser array |
| JPH05300096A (en) * | 1992-04-21 | 1993-11-12 | Fujitsu Ltd | Optical transmitter and optical receiver for optical parallel transmission and optical parallel transmitting system provided with them |
| US6389046B1 (en) * | 1999-04-12 | 2002-05-14 | Agere Systems Guardian Corp. | Method to sense laser array power and wavelength and reduce drift for wavelength selection and stabilization |
| US6501773B1 (en) * | 2000-06-19 | 2002-12-31 | Versatile Optical Networks, Inc. | Stabilization of a laser array module |
| JP4489282B2 (en) * | 2000-12-14 | 2010-06-23 | 独立行政法人科学技術振興機構 | Spectrometer |
| US20050180134A1 (en) * | 2004-02-18 | 2005-08-18 | Robert Dal Sasso | Means of Achieving a Lambertian Distribution Light Source via a Light Emitting Diode Array |
| EP1855102B8 (en) * | 2005-02-15 | 2012-03-14 | Mitsui Engineering and Shipbuilding Co, Ltd. | Fluorescence detecting device and fluorescence detecting method |
| JP2009200452A (en) * | 2008-02-20 | 2009-09-03 | Ritsuo Hasumi | Time sharing wavelength stabilizing optical transmitter |
| CA2782964C (en) * | 2010-03-02 | 2016-01-19 | Tsinghua University | Parallel excitation system capable of spatial encoding and method thereof |
| CN102629731B (en) * | 2012-02-14 | 2015-04-29 | 浙江嘉莱光子技术有限公司 | Control method for simultaneously stabilizing laser wavelength and power and control device thereof |
| CN103560853B (en) * | 2013-10-11 | 2016-05-25 | 武汉邮电科学研究院 | The frequency stabilization system and method for multiple light courcess in multi-subcarrier system |
| CN103781253B (en) * | 2014-01-23 | 2015-08-26 | 安徽理工大学 | A kind of method and apparatus controlling wideband light source stabilized intensity |
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| CN107462551B (en) * | 2017-09-05 | 2023-08-22 | 安徽宝龙环保科技有限公司 | Laser wavelength locking method and device for gas detection |
| CN207305000U (en) * | 2017-10-10 | 2018-05-01 | 北京佳光科技有限公司 | A kind of lighting device and laser radar system |
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