CN103776529A - Desktop laser power meter capable of real-time compensation and compensation method thereof - Google Patents
Desktop laser power meter capable of real-time compensation and compensation method thereof Download PDFInfo
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- CN103776529A CN103776529A CN201410046027.4A CN201410046027A CN103776529A CN 103776529 A CN103776529 A CN 103776529A CN 201410046027 A CN201410046027 A CN 201410046027A CN 103776529 A CN103776529 A CN 103776529A
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Abstract
The invention discloses a desktop laser power meter capable of real-time compensation and compensation method of the desktop laser power meter. The laser power meter comprises a power module, a photoelectric detector, an I/V and range convertor, a first A/D convertor, a central processor, an LCD drive, an LCD module, a temperature acquisition module, an IV convertor and a second A/D convertor. The method comprises the steps that measured light is detected to obtain a laser power value initial value, and meanwhile an actual temperature value of the photoelectric detector is obtained; the temperature value of the photoelectric detector and a standard laser power value at corresponding temperature are preset; the ratio of the measured laser power value initial value to the standard laser power value is used as a compensation factor at the actual temperature; a laser power value after compensation is obtained by multiplying the measured laser power value initial value by the compensation factor at the actual temperature and output. According to the desktop laser power meter and the compensation method, compensation is performed on the measured laser power value, so that the temperature characteristic of the laser power meter is greatly improved, and errors caused by temperature drift of an existing laser power meter in the long-time measurement process are eliminated.
Description
Technical field
The present invention relates to a kind of desk-top laser powermeter and compensation method thereof that can real-Time Compensation, belong to the technical field of signal measurement apparatus.
Background technology
Optical fiber communication is the total reflection principle that utilizes light, and light is transmitted in fiber core according to certain pattern.In optical signal transmission field, the use of optical fiber is very extensive.
The light power meter that optical communication field uses is used for the power (energy) of the light passing through in measuring optical fiber link.Tradition optical power system mainly comprises the modules such as photoelectric sensor module, signal conditioning circuit, analog-to-digital converting module, data processing unit, power supply, display, keyboard etc.
Generally, the long-time stability that the test of laser power value is tested luminous power and the uncertainty of power are less demanding, this variation does not affect test effect, but the occasion that needs long-term monitoring, testing laser power at some, the variation meeting of temperature brings very large impact to test result.If need at present the long-term laser power stability degree that detects some light paths, have to consider secondary calibration or avoid the temperature characterisitic of laser powermeter, such as, laser powermeter is done to constant temperature processing, light power meter is placed in a constant temperature oven, guarantees the long-term uncertainty of light power meter with this.
All there is a problem in the conventional power meter on existing market: due to the existence of the temperature-responsive of laser powermeter detector itself and the temperature drift of circuit, make in the time of the temperature change that the environment temperature of laser powermeter and the heating of equipment of itself cause, its measured performance number has corresponding variation.Therefore there is limitation in existing laser powermeter.
Summary of the invention
Technical matters to be solved by this invention is to overcome the deficiencies in the prior art, a kind of desk-top laser powermeter and compensation method thereof that can real-Time Compensation be provided, the laser power value recording is compensated, the temperature characterisitic of laser powermeter is significantly improved, greatly improve the uncertainty of the long-term measured value of laser power, while having solved long-term measurement, the error that the temperature drift of laser powermeter itself brings, thus expand the range of application of laser powermeter.
The present invention specifically solves the problems of the technologies described above by the following technical solutions:
A kind of desk-top laser powermeter that can real-Time Compensation, comprise power module, photodetector, I/V and span-changing device, the first A/D converter, central processing unit, lcd driver, LCD module, temperature collect module, I/V converter, the second A/D converter, wherein said power module is for power supply; Described photodetector is converted to the light signal detecting digital signal input central processing unit after I/V and span-changing device, the first A/D converter, and described central processing unit calculates and obtains laser power value initial value; The temperature signal that simultaneously described temperature collect module is measured photodetector is converted to digital signal input central processing unit through I/V converter, the second A/D converter, and described central processing unit calculates and obtains photodetector actual temperature value; Described central processing unit carries out analyzing and processing in conjunction with laser power value initial value and actual temperature value, determine the power back-off coefficient under corresponding temperature and obtain the laser power value after compensation according to this penalty coefficient, driving LCD module that the laser power value after described compensation is shown by lcd driver.
As a preferred technical solution of the present invention: described temperature collect module is occasionally temperature acquisition chip of thermoelectricity.
As a preferred technical solution of the present invention: also comprise low-pass first order filter, described low-pass first order filter is for carrying out filtering processing to the signal after I/V and span-changing device conversion.
As a preferred technical solution of the present invention: also comprise the communication module being connected with central processing unit, described communication module for and external device communication.
A compensation method for above-mentioned desk-top laser powermeter that can real-Time Compensation, comprises the following steps:
Step (1), utilize photodetector to survey by photometry to obtain laser power value initial value, the temperature of simultaneously measuring described photodetector obtains the actual temperature value of photodetector;
Standard laser performance number under step (2), default photodetector temperature value and corresponding temperature; To measure gained actual temperature value corresponding with default photodetector temperature value, will measure the penalty coefficient under this actual temperature that is compared to of gained laser power value initial value and the corresponding standard laser performance number of photodetector temperature value;
The penalty coefficient that step (3), utilization measurement gained laser power value initial value are multiplied by under gained actual temperature obtains the laser power value after compensation and exports.
Further, as a preferred technical solution of the present invention: described step (2) also comprises measures a series of actual temperature value, and obtains the penalty coefficient under each actual temperature; By gained series penalty coefficient coefficient set by way of compensation; Utilize and measure gained actual temperature value directly obtain penalty coefficient corresponding to the concentrated temperature value of penalty coefficient.
Further, as a preferred technical solution of the present invention: described penalty coefficient collection is fitted to temperature compensation curve, utilize and measure gained actual temperature value directly obtain penalty coefficient corresponding to temperature range in temperature compensation curve.
Further, as a preferred technical solution of the present invention: utilize least square method that the penalty coefficient collection obtaining is fitted to temperature compensation curve.
Further, as a preferred technical solution of the present invention: adopt the occasionally temperature of temperature acquisition chip measurement photodetector of thermoelectricity in described step (1).
The present invention adopts technique scheme, can produce following technique effect:
Desk-top laser powermeter of the present invention and compensation method thereof, the actual temperature of measuring by combination and laser power value initial value are analyzed, obtain the power back-off coefficient under corresponding temperature, the laser power value recording is compensated, there is the function of automated power compensation, the temperature characterisitic of laser powermeter is significantly improved, greatly improve the long-term uncertainty of measuring of laser power, while having solved long-term measurement, the error that the temperature drift of laser powermeter itself brings, thereby expand the range of application of laser powermeter, make up the blank of domestic temperature compensation laser powermeter.
Accompanying drawing explanation
Fig. 1 is the module diagram of the desk-top laser powermeter that the present invention can real-Time Compensation.
Fig. 2 is the module diagram that desk-top laser powermeter that the present invention can real-Time Compensation adopts thermopair.
Fig. 3 is the module diagram that desk-top laser powermeter that the present invention can real-Time Compensation adopts temperature acquisition chip.
Fig. 4 is temperature compensation curve figure in the compensation method of the desk-top laser powermeter that the present invention can real-Time Compensation.
Embodiment
Below in conjunction with Figure of description, embodiments of the present invention are described.
As shown in Figure 1, the present invention has designed a kind of desk-top laser powermeter that can real-Time Compensation, comprise power module, photodetector, I/V and span-changing device, the first A/D converter, central processing unit, lcd driver, LCD module, temperature collect module, I/V converter, the second A/D converter, wherein said power module is for power supply; The light signal detecting is converted to electric signal by described photodetector; Described I/V and span-changing device are for being converted to described electric signal voltage signal and carrying out range switching; Described voltage signal is converted to digital signal input central processing unit by described A/D converter, and described central processing unit calculates and obtains laser power value initial value; The temperature transition that described temperature collect module of while is measured described photodetector is electric signal, this electric signal converts voltage signal to through I/V converter, this voltage signal is converted to digital signal input central processing unit through the second A/D converter, and described central processing unit calculates and obtains photodetector actual temperature value; Described central processing unit carries out analyzing and processing in conjunction with laser power value initial value and actual temperature value, determine the power back-off coefficient under corresponding temperature and obtain the laser power value after compensation according to this penalty coefficient, driving LCD module that the laser power value after described compensation is shown by lcd driver.
For temperature collect module, can be realized by two kinds of modes.One is to take thermopair as temperature sensor, as shown in Figure 2, the variation of thermopair environment temperature is converted to the variation of resistance, then by I/V converter, resistance variations is converted to voltage signal, then is converted to the manageable digital signal of central processing unit by the second A/D converter.Another kind is to adopt temperature acquisition chip to gather the temperature of photodetector, and temperature acquisition chip can be realized the collection of temperature as TMP421 coordinates triode as 2N3906, and principle as shown in Figure 3.
In addition, the impact bringing in order to reduce noise, also comprises low-pass first order filter, and low-pass first order filter is for the signal after I/V and span-changing device conversion is carried out to filtering processing, thus elimination noise.Light power meter also comprises the communication module being connected with central processing unit, and communication module is used for and external device communication.
On the basis of above-mentioned desk-top laser powermeter that can real-Time Compensation, propose a kind of compensation method, comprise the following steps:
The laser that step (1) is chosen a power is input to the photodetector of light power meter in this, this laser is in laser powermeter detectable range, photodetector is surveyed by photometry and is obtained laser power value initial value Pi, and the temperature of simultaneously measuring described photodetector obtains the actual temperature value Ti of photodetector.Wherein, while obtaining the actual temperature value Ti of photodetector, can adopt the occasionally temperature of temperature acquisition chip measurement photodetector of thermoelectricity.
Standard laser performance number Pf under the default photodetector temperature value of step (2) and corresponding temperature, for the acquisition of this standard laser performance number Pf, can adopt technological means commonly known in the art to obtain, if the Laser output that can pass through same power is in etalon optical power meter, the performance number that etalon optical power meter measures is the standard laser performance number Pf of etalon optical power meter.To measure gained actual temperature value Ti corresponding with default photodetector temperature value, will measure the penalty coefficient Ri under this actual temperature that is compared to of gained laser power value initial value Pf and the corresponding standard laser performance number of photodetector temperature value.In addition, can measure serial actual temperature value, according to a different temperatures corresponding standard laser performance number one by one, obtain the penalty coefficient under each actual temperature, the multiple different actual temperature value that record according to photodetector are T
1, T
2, T
3.. T
n, obtain penalty coefficient R corresponding to each actual temperature value
1, R
2, R
3... Rn.By a series of gained penalty coefficients, coefficient set is pre-stored by way of compensation, then utilizes measurement gained actual temperature value to concentrate temperature value corresponding with penalty coefficient, directly obtains the power back-off coefficient under corresponding actual temperature.
Then, the penalty coefficient collection of gained can be fitted to temperature compensation curve, this temperature compensation curve can be as shown in Figure 4, make for any practical temperature value in measurement range, there is unique penalty coefficient corresponding with it, the corresponding power back-off coefficient of actual temperature value can directly be obtained temperature compensation curve.Wherein, can utilize least square method, by what obtain, penalty coefficient collection is fitted to temperature compensation curve.In the time of reference temperature(TR) compensated curve, according to corresponding temperature interval in the actual temperature value Ti controlled temperature compensated curve of measurement gained, be the lateral coordinates in corresponding diagram 4, then determine penalty coefficient according to lateral coordinates, read the corresponding ordinate value of this temperature range lower curve and be penalty coefficient.
The penalty coefficient that step (3) utilizes measurement gained laser power value initial value Pi to be multiplied by under gained actual temperature obtains laser power value the output after compensation.If utilize temperature compensation curve, utilize measurement gained laser power value initial value Pi to be multiplied by the penalty coefficient Ri under corresponding temperature interval in temperature compensation curve and export after obtaining the laser power value after compensation, realize the power back-off under corresponding temperature.
The present invention is for fiber optic communication field, related laser powermeter is in the time obtaining temperature compensation data, by obtaining intensive temperature---power samples point, then according to the morphological character of curve, temperature compensation characteristic is fitted to a continuous curve, make can in any performance number in testing range (70dBm ~ 2dBm), all can calculate accurate measured value by second compensation through the laser powermeter of Overpower compensating.
And due to spy's custom of optical communication measurement, a laser powermeter need to have the function of measuring multi-wavelength, therefore the temperature compensation of this desk-top laser powermeter is carried out for all measurement wave bands of laser powermeter, such as: 1550nm, 1490nm, 1310nm, 980nm, 850nm etc., this laser powermeter will be drawn out a continuous temperature compensation curve for each wave band, for initial measured value is calibrated, the temperature characterisitic of laser powermeter is significantly improved, greatly improve the uncertainty of the long-term measured value of laser power, while having solved long-term measurement, the error that the temperature drift of laser powermeter itself brings.
In order to verify that laser powermeter of the present invention and compensation method thereof can carry out auto-compensation to the laser power value recording, enumerate an embodiment and describe.
First, utilize according to the method described above least square method that the penalty coefficient collection obtaining is fitted to temperature compensation curve, this curve as shown in Figure 4, the corresponding unique penalty coefficient of each temperature value.The photodetector recycling in laser powermeter of the present invention is surveyed two groups of light signals, be digital signal via module converts such as I/V and span-changing device, low-pass first order filter, the first A/D converters, and process and obtain two luminous power initial value 0.5mw, 0.62mw by central processing unit; Meanwhile, the signal being gathered as temperature sensor by thermopair is by I/V converter, the second A/D converter, and obtains 30 ℃ of actual temperature value by central processing unit.Then according to 30 ℃ of the actual temperature value obtaining, obtain penalty coefficient 0.95 from temperature compensation curve, two luminous power initial value 0.5mw, 0.62mw are multiplied by respectively penalty coefficient 0.95 corresponding to this temperature range of coefficient, can obtain optical power value 0.5mw*0.95=0.475mw, the 0.62mw*0.95=0.589mw of final two-way measurement passage.Finally, central processing unit is sent to LCD module by luminous power evaluation 0.475mw, 0.589mw after these two compensation and shows or be transferred to external communication device by communication module, completes a compensation process.
Therefore, verify that by embodiment the present invention compensates the laser power value recording, the temperature characterisitic of laser powermeter is significantly improved, greatly improve the uncertainty of the long-term measured value of laser power, while having solved long-term measurement, the error that the temperature drift of laser powermeter itself brings, thus the range of application of laser powermeter expanded.
By reference to the accompanying drawings embodiments of the present invention are explained in detail above, between each circuit module, be connected according to means commonly known in the art, but the present invention is not limited to above-mentioned embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, make a variety of changes.
Claims (9)
- One kind can real-Time Compensation desk-top laser powermeter, it is characterized in that: comprise power module, photodetector, I/V and span-changing device, the first A/D converter, central processing unit, lcd driver, LCD module, temperature collect module, I/V converter, the second A/D converter, wherein said power module is for power supply; Described photodetector is converted to the light signal detecting digital signal input central processing unit after I/V and span-changing device, the first A/D converter, and described central processing unit calculates and obtains laser power value initial value; The temperature signal that simultaneously described temperature collect module is measured photodetector is converted to digital signal input central processing unit through I/V converter, the second A/D converter, and described central processing unit calculates and obtains photodetector actual temperature value; Described central processing unit carries out analyzing and processing in conjunction with laser power value initial value and actual temperature value, determine the power back-off coefficient under corresponding temperature and obtain the laser power value after compensation according to this penalty coefficient, driving LCD module that the laser power value after described compensation is shown by lcd driver.
- 2. desk-top laser powermeter that according to claim 1 can real-Time Compensation, is characterized in that: described temperature collect module is occasionally temperature acquisition chip of thermoelectricity.
- 3. desk-top laser powermeter that according to claim 1 can real-Time Compensation, is characterized in that: also comprise low-pass first order filter, described low-pass first order filter is for carrying out filtering processing to the signal after I/V and span-changing device conversion.
- 4. desk-top laser powermeter that according to claim 1 can real-Time Compensation, is characterized in that: also comprise the communication module being connected with central processing unit, described communication module for and external device communication.
- 5. a compensation method for the desk-top laser powermeter based on can real-Time Compensation described in claim 1, is characterized in that, comprises the following steps:Step (1), utilize photodetector to survey by photometry to obtain laser power value initial value, the temperature of simultaneously measuring described photodetector obtains the actual temperature value of photodetector;Standard laser performance number under step (2), default photodetector temperature value and corresponding temperature; To measure gained actual temperature value corresponding with default photodetector temperature value, will measure the penalty coefficient under this actual temperature that is compared to of gained laser power value initial value and the corresponding standard laser performance number of photodetector temperature value;The penalty coefficient that step (3), utilization measurement gained laser power value initial value are multiplied by under gained actual temperature obtains the laser power value after compensation and exports.
- 6. the compensation method of desk-top laser powermeter that according to claim 5 can real-Time Compensation, is characterized in that: described step (2) also comprises measures a series of actual temperature value, and obtains the penalty coefficient under each actual temperature; By gained series penalty coefficient coefficient set by way of compensation; Utilize and measure gained actual temperature value directly obtain penalty coefficient corresponding to the concentrated temperature value of penalty coefficient.
- 7. the compensation method of desk-top laser powermeter that according to claim 6 can real-Time Compensation, it is characterized in that: described penalty coefficient collection is fitted to temperature compensation curve, utilize and measure gained actual temperature value directly obtain penalty coefficient corresponding to temperature range in temperature compensation curve.
- 8. the compensation method of desk-top laser powermeter that according to claim 7 can real-Time Compensation, is characterized in that: utilize least square method that the penalty coefficient collection obtaining is fitted to temperature compensation curve.
- 9. the compensation method of desk-top laser powermeter that according to claim 5 can real-Time Compensation, is characterized in that: in described step (1), adopt thermoelectricity occasionally temperature acquisition chip measure the temperature of photodetector.
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Cited By (9)
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| CN104913844A (en) * | 2015-04-30 | 2015-09-16 | 浙江天创信测通信科技有限公司 | Calibration-free optical power meter |
| CN106813776A (en) * | 2016-12-09 | 2017-06-09 | 中国科学院自动化研究所 | Multrirange optical detection device |
| CN106970409A (en) * | 2017-05-17 | 2017-07-21 | 成都理工大学 | The γ absorbed dose rates instrument corrected with soil moisture and bearing calibration |
| CN111060197A (en) * | 2019-11-27 | 2020-04-24 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | Photoelectric detector and calibration and test method thereof |
| CN113375795A (en) * | 2021-06-28 | 2021-09-10 | 中国人民解放军92493部队计量测试研究所 | Heat loss compensation method for laser energy meter |
| CN114526815A (en) * | 2022-02-07 | 2022-05-24 | 中电科思仪科技股份有限公司 | Temperature and humidity compensation method for improving optical power measurement accuracy |
| CN114734137A (en) * | 2022-02-17 | 2022-07-12 | 苏州创鑫激光科技有限公司 | Calibration method and system of laser equipment |
| CN115097663A (en) * | 2022-06-17 | 2022-09-23 | 中国科学院上海光学精密机械研究所 | Method for compensating phase regulation and control characteristics of liquid crystal variable delayer under continuous laser work |
| CN115986548A (en) * | 2023-03-16 | 2023-04-18 | 四川中久大光科技有限公司 | Temperature-compensated laser output power automatic real-time calibration device and method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913844A (en) * | 2015-04-30 | 2015-09-16 | 浙江天创信测通信科技有限公司 | Calibration-free optical power meter |
| CN106813776A (en) * | 2016-12-09 | 2017-06-09 | 中国科学院自动化研究所 | Multrirange optical detection device |
| CN106970409A (en) * | 2017-05-17 | 2017-07-21 | 成都理工大学 | The γ absorbed dose rates instrument corrected with soil moisture and bearing calibration |
| CN106970409B (en) * | 2017-05-17 | 2023-08-25 | 成都理工大学 | Gamma absorption dose rate instrument with soil humidity correction function and correction method |
| CN111060197A (en) * | 2019-11-27 | 2020-04-24 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | Photoelectric detector and calibration and test method thereof |
| CN113375795B (en) * | 2021-06-28 | 2023-07-25 | 中国人民解放军92493部队计量测试研究所 | Heat loss compensation method for laser energy meter |
| CN113375795A (en) * | 2021-06-28 | 2021-09-10 | 中国人民解放军92493部队计量测试研究所 | Heat loss compensation method for laser energy meter |
| CN114526815A (en) * | 2022-02-07 | 2022-05-24 | 中电科思仪科技股份有限公司 | Temperature and humidity compensation method for improving optical power measurement accuracy |
| CN114526815B (en) * | 2022-02-07 | 2023-09-01 | 中电科思仪科技股份有限公司 | Temperature and humidity compensation method for improving optical power measurement accuracy |
| CN114734137A (en) * | 2022-02-17 | 2022-07-12 | 苏州创鑫激光科技有限公司 | Calibration method and system of laser equipment |
| CN115097663A (en) * | 2022-06-17 | 2022-09-23 | 中国科学院上海光学精密机械研究所 | Method for compensating phase regulation and control characteristics of liquid crystal variable delayer under continuous laser work |
| CN115097663B (en) * | 2022-06-17 | 2024-02-09 | 中国科学院上海光学精密机械研究所 | Method for compensating phase regulation characteristic of liquid crystal variable delayer under continuous laser operation |
| CN115986548A (en) * | 2023-03-16 | 2023-04-18 | 四川中久大光科技有限公司 | Temperature-compensated laser output power automatic real-time calibration device and method |
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Application publication date: 20140507 |