CN114526815A - Temperature and humidity compensation method for improving optical power measurement accuracy - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0252—Constructional arrangements for compensating for fluctuations caused by, e.g. temperature, or using cooling or temperature stabilization of parts of the device; Controlling the atmosphere inside a photometer; Purge systems, cleaning devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
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Abstract
The invention discloses a temperature and humidity compensation method for improving the measurement accuracy of optical power, which comprises the following steps: calibrating the power value of a target optical power meter under different temperature and humidity conditions and different output powers of a light source by using the measurement data of the standard optical power meter to obtain an optical power calibration value; acquiring an optical power measured value at the next moment according to the optical power calibration value, predicting an optical power value at the next moment, and calculating an output optical power value and a corresponding output state covariance factor according to the optical power measured value at the next moment and the optical power predicted value at the next moment; and calculating an output error according to the output optical power value and the optical power measured value, ending iteration when the output error is smaller than a first set threshold and the output state covariance factor is smaller than a second set threshold, and outputting a final optical power value, otherwise returning to the step 2. The method disclosed by the invention can be used for carrying out real-time temperature and humidity compensation on the measurement result of the optical power meter, and can be applied to scenes such as severe environment measurement and the like.
Description
Technical Field
The invention relates to the field of optical power measurement, in particular to a temperature and humidity compensation method for improving the accuracy of optical power measurement.
Background
The optical power meter is used as an important component in optical wave measurement, the measurement accuracy of the optical power meter can have great influence on the measurement result, the temperature and the humidity are found to influence the measurement accuracy of the optical power meter, the influence degrees of different temperatures and humidities on the measurement accuracy are different, and when the temperature and the humidity act on the optical power meter at the same time, the measurement trend of the optical power is different from the situation that only one condition of the temperature or the humidity acts on the optical power meter. If the collected power value is directly used as a final measurement value, the optical power meter cannot respond to the change of the temperature and the humidity in time, the measurement speed is influenced, and the method is not suitable for occasions such as high-speed measurement and the like.
In the prior art, the influence of two factors of temperature and humidity on the measurement accuracy of a power meter is not considered, and the measurement power value cannot quickly respond to the change of temperature and humidity, so that the power meter is not suitable for occasions such as high-speed measurement in severe environments.
Disclosure of Invention
In order to solve the technical problems, the invention provides a temperature and humidity compensation method for improving the accuracy of optical power measurement, which is used for compensating the temperature and humidity of the measurement result of an optical power meter.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a temperature and humidity compensation method for improving the accuracy of optical power measurement comprises the following steps:
step 1, calibrating the power value of a target optical power meter under different temperature and humidity conditions and under different output power conditions of a light source by using measurement data of a standard optical power meter to obtain an optical power calibration value;
step 2, collecting an optical power measured value at the next moment according to the optical power calibration value, predicting an optical power value at the next moment to obtain an optical power predicted value at the next moment, and calculating an output optical power value and a corresponding output state covariance factor according to the optical power measured value at the next moment and the optical power predicted value at the next moment;
and 3, calculating an output error according to the output light power value and the light power measured value, finishing iteration when the output error is smaller than a first set threshold and the output state covariance factor is smaller than a second set threshold, and outputting a final light power value, otherwise returning to the step 2.
In the above scheme, the step 1 includes the following steps:
step 1.1, measuring optical power values under different temperature and humidity environments by using a standard optical power meter;
step 1.2, adjusting the output light power value of the light source, calibrating the light power values of the target light power meter corresponding to different output powers in different temperature and humidity environments according to the light power values of the standard light power meter in different temperature and humidity environments, and obtaining the light power calibration value.
In a further technical scheme, the step 1.1 is specifically as follows:
under the reference environment with the temperature of 0 ℃ and the humidity of 20%, the output light power value of a 1550nm light source is adjusted to be 10dBm, and then under different temperature and humidity conditions with the temperature of 0-40 ℃ and the humidity of 20-60%, the light power value P under the corresponding condition is measured by a standard optical power meter1mnWherein P is1mnThe output power of a light source in a reference environment is 10dBm, the optical power value measured by a standard optical power meter under the conditions that the temperature at the current moment is 0.5(m-1) DEG C and the humidity is (20+ n-1)%, wherein m is 1, 2. n-1, 2, 41, with a temperature interval of 0.5 ℃ and a humidity interval of 1%.
In a further technical scheme, the step 1.2 is specifically as follows:
adjusting the output light power value of the light source to-80-10 dBm, adjusting the interval to 1dB, and calibrating the light power value P of the target light power meter corresponding to the output powerkmn＝P1mn-k+1，PkmnThe light power calibration value P of a target light power meter under the conditions that the output power of a light source is (11-k) dBm, the temperature is 0.5(m-1) DEG C and the humidity is (20+ n-1)%, is1mnThe light power value measured by a standard optical power meter under the conditions that the output power of a light source under a reference environment is 10dBm, the temperature is 0.5(m-1) DEG C, and the humidity is (20+ n-1)%, wherein m is 1, 2,. multidot.81; n is 1, 2, 41, k is 1, 2.
In the above scheme, the step 2 includes the following steps:
step 2.1, initializing an optical power predicted value of the target optical power meter;
step 2.2, predicting the optical power value at the next moment and collecting the optical power measured value at the next moment;
step 2.3, calculating a state gain factor according to the predicted value of the optical power at the next moment;
step 2.4, calculating a prediction error value according to the optical power measured value at the next moment and the optical power predicted value at the next moment;
and 2.5, calculating the output light power value according to the prediction error value and the state gain factor.
In a further technical scheme, the step 2.1 is specifically as follows:
searching a corresponding optical power calibration value according to the current temperature and humidity and the electric signal acquired by the target optical power meter, and calculating the optical power measurement value P at the current momentv＝HPkmnInitial optical power prediction value Pe＝PvInitialization state covariance factor VeWherein H is a measured transfer factor.
In a further technical scheme, the step 2.2 is specifically as follows:
predicting the optical power value P at the next momente1＝G*Pe+ W, its corresponding state covariance factor V at the next time instante1＝G*Ve*GT+ Q, according to the humiture at next moment and the electric signal collected by the target optical power meter, searching the corresponding optical power calibration value, and calculating the optical power measurement value P at next momentv1＝HPkmn1Wherein G is an estimated state transition factor, W is an external disturbance term, Q is an external disturbance covariance factor, VeIs a state covariance factor, PeIs the initial light power prediction value, H is the measured transfer factor, Pkmn1The output power of a light source is (11-k) dBm, the temperature at the next moment is 0.5(m-1) DEG C, and the optical power of a target optical power meter is calibrated under the condition that the humidity is (20+ n-1)%, wherein m is 1, 2. n is 1, 2, 41, k is 1, 2. .
In a further technical scheme, the step 2.3 is specifically as follows:
calculating the state gain factor K ═ Pe1*(H*Pe1*HT)-1Wherein P ise1The predicted value of the optical power at the next moment is H, and the measurement transfer factor is H.
In a further technical scheme, the step 2.4 is specifically as follows:
calculating a prediction error value error ═ Pv1-H*Pe1Wherein P ise1Is the predicted value of optical power at the next moment, H is the measured transfer factor, Pv1Is the optical power measurement at the next time instant.
In a further technical scheme, the step 2.5 is specifically as follows:
calculating the output light power value Po＝Pe1+ K error, its corresponding output state covariance factor Vo＝(1-K*H)*Pe1Wherein P ise1The predicted value of the optical power at the next moment is H, the measurement transfer factor is H, the state gain factor is K, and the error value is error.
Through the technical scheme, the temperature and humidity compensation method for improving the accuracy of optical power measurement has the following beneficial effects:
according to the invention, the actually measured optical power value is compensated according to the optical power calibration values under different temperature and humidity conditions, and the measurement accuracy of the optical power meter is improved by adopting a real-time observation and correction method. The method fully considers the influence of two factors of temperature and humidity on the measurement accuracy of the power meter; meanwhile, the method has real-time performance, quickly responds to the influence of the temperature and the humidity on the optical power meter, and can be applied to scenes such as severe environment measurement and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic flow chart of a temperature and humidity compensation method for improving the accuracy of optical power measurement according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating step 2 according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a temperature and humidity compensation method for improving the accuracy of optical power measurement, which comprises the following steps as shown in figure 1:
step 1, calibrating the power value of a target optical power meter under different temperature and humidity conditions and under different output power conditions of a light source by using measurement data of a standard optical power meter to obtain an optical power calibration value;
the method specifically comprises the following steps:
step 1.1, measuring optical power values under different temperature and humidity environments by using a standard optical power meter, specifically as follows:
under the reference environment that the temperature is 0 ℃ and the humidity is 20%, the output light power value of a 1550nm light source is adjusted to be 10dBm, and then under the conditions of different humiture within the temperature range of 0-40 ℃ and the humidity of 20-60%, the light power value P under the corresponding condition is measured by a standard optical power meter1mnWherein P is1mnThe light power value measured by a standard optical power meter under the conditions that the output power of a light source under a reference environment is 10dBm, the temperature is 0.5(m-1) DEG C, and the humidity is (20+ n-1)%, wherein m is 1, 2, …, 81; n-1, 2, 41, with a temperature interval of 0.5 ℃ and a humidity interval of 1%.
Step 1.2, adjusting an output light power value of the light source, calibrating light power values of the target optical power meter corresponding to different output powers in different temperature and humidity environments according to light power values of different temperature and humidity environments measured by the standard optical power meter, and obtaining an optical power calibration value, wherein the optical power calibration value is specifically as follows:
adjusting the output light power value of the light source to be-80-10 dBm, adjusting the interval to be 1dB, and calibrating the light power value P of the target light power meter corresponding to the output powerkmn＝P1mn-k+1，PkmnThe output power of the light source is (11-k) dBm, the temperature at the current moment is 0.5(m-1) DEG C, and the humidity is (20+ n-1)%, under the conditionOptical power calibration value, P, of a calibration optical power meter1mnThe light power value measured by a standard optical power meter under the conditions that the output power of a light source under a reference environment is 10dBm, the temperature is 0.5(m-1) DEG C, and the humidity is (20+ n-1)%, wherein m is 1, 2,. multidot.81; n is 1, 2, 41, k is 1, 2.
Step 2, collecting an optical power measured value at the next moment according to the optical power calibration value, predicting an optical power value at the next moment to obtain an optical power predicted value at the next moment, and calculating an output optical power value and a corresponding output state covariance factor according to the optical power measured value at the next moment and the optical power predicted value at the next moment;
as shown in fig. 2, the method specifically includes the following steps:
step 2.1, initializing the optical power predicted value of the target optical power meter, specifically as follows:
searching a corresponding optical power calibration value according to the current temperature and humidity and the electric signal acquired by the target optical power meter, and calculating the optical power measurement value P at the current momentv＝HPkmnInitial optical power prediction value Pe＝PvInitialization of the state covariance factor eeWherein H is a measurement transfer factor, and V is measured in a simulation experimente＝0.01，H＝1。
Step 2.2, predicting the optical power value at the next moment and collecting the optical power measured value at the next moment, which is as follows:
predicting the optical power value P at the next momente1＝G*Pe+ W, its corresponding state covariance factor V at the next time instante1＝G*Ve*GT+ Q, according to the humiture at next moment and the electric signal collected by the target optical power meter, searching the corresponding optical power calibration value, and calculating the optical power measurement value P at next momentv1＝HPkmn1Wherein G is an estimated state transition factor, W is an external disturbance term, Q is an external disturbance covariance factor, VeIs a state covariance factor, PeIs the initial light power prediction value, H is the measured transfer factor, Pkmn1The output power of the light source is (11-k) dBm, the temperature at the next moment is 0.5(m-1) DEG C, and the target light is under the condition that the humidity is (20+ n-1)%In a simulation experiment, G is 1, W is 0, H is 1, and Q is 0.01.
Step 2.3, calculating a state gain factor according to the predicted value of the optical power at the next moment, which is specifically as follows:
calculating the state gain factor K ═ Pe1*(H*Pe1*HT)-1Wherein P ise1H is a measured transfer factor, and H is 1 in a simulation experiment.
Step 2.4, calculating a prediction error value according to the optical power measured value at the next moment and the optical power predicted value at the next moment, wherein the method specifically comprises the following steps:
calculating a prediction error value error ═ Pv1-H*Pe1Wherein P ise1Is the predicted value of optical power at the next moment, H is the measured transfer factor, Pv1For the measured optical power value at the next time, H is 1 in the simulation experiment.
Step 2.5, calculating an output light power value according to the prediction error value and the state gain factor, wherein the specific steps are as follows:
calculating the output light power value Po＝Pe1+ K error, its corresponding output state covariance factor Vo＝(1-K*H)*Pe1Wherein P ise1The predicted value of the optical power at the next moment is H, the measurement transfer factor is H, the state gain factor is K, and the error value is error.
And 3, calculating an output error according to the output light power value and the light power measured value, finishing iteration when the output error is smaller than a first set threshold and the output state covariance factor is smaller than a second set threshold, and outputting a final light power value, otherwise returning to the step 2.
The specific method comprises the following steps:
calculating the output error errm ═ Po-Pv1If errm<0.02, and Vo<0.5, then Pf＝PoNo, Pf＝Pf(ii) a Go to step 2, wherein PfFor the final optical power value, PoTo output a light power value, VoIs the output state covariance factor.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A temperature and humidity compensation method for improving the accuracy of optical power measurement is characterized by comprising the following steps:
step 1, calibrating the power value of a target optical power meter under different temperature and humidity conditions and under different output power conditions of a light source by using measurement data of a standard optical power meter to obtain an optical power calibration value;
step 2, collecting an optical power measured value at the next moment according to the optical power calibration value, predicting an optical power value at the next moment to obtain an optical power predicted value at the next moment, and calculating an output optical power value and a corresponding output state covariance factor according to the optical power measured value at the next moment and the optical power predicted value at the next moment;
and 3, calculating an output error according to the output light power value and the light power measured value, finishing iteration when the output error is smaller than a first set threshold and the output state covariance factor is smaller than a second set threshold, and outputting a final light power value, otherwise returning to the step 2.
2. The temperature and humidity compensation method for improving the accuracy of optical power measurement according to claim 1, wherein the step 1 comprises the steps of:
step 1.1, measuring optical power values under different temperature and humidity environments by using a standard optical power meter;
step 1.2, adjusting the output light power value of the light source, calibrating the light power values of the target light power meter corresponding to different output powers in different temperature and humidity environments according to the light power values of the standard light power meter in different temperature and humidity environments, and obtaining the light power calibration value.
3. The temperature and humidity compensation method for improving the accuracy of optical power measurement according to claim 2, wherein the step 1.1 is as follows:
adjusting the output light power value of a 1550nm light source to be 10dBm in a reference environment with the temperature of 0 ℃ and the humidity of 20%, and then measuring an optical power value P1mn under the corresponding condition by using a standard optical power meter under different temperature and humidity conditions with the temperature of 0-40 ℃ and the humidity of 20-60%, wherein P1mn is the optical power value measured by the standard optical power meter under the conditions that the output power of the light source is 10dBm in the reference environment, the temperature is 0.5(m-1) DEG C, and the humidity is (20+ n-1)%, and m is 1, 2,. 81; n-1, 2, 41, with a temperature interval of 0.5 ℃ and a humidity interval of 1%.
4. The temperature and humidity compensation method for improving the accuracy of optical power measurement according to claim 2, wherein the step 1.2 is as follows:
adjusting the output light power value of the light source to-80-10 dBm, adjusting the interval to 1dB, and calibrating the light power value P of the target light power meter corresponding to the output powerkmn＝P1mn-k+1，PkmnThe light power calibration value P of a target light power meter under the conditions that the output power of a light source is (11-k) dBm, the temperature at the current moment is 0.5(m-1) DEG C and the humidity is (20+ n-1)%, and P is1mnThe light power value measured by a standard optical power meter under the conditions that the output power of a light source under a reference environment is 10dBm, the temperature is 0.5(m-1) DEG C, and the humidity is (20+ n-1)%, wherein m is 1, 2,. multidot.81; n is 1, 2, 41, k is 1, 2.
5. The temperature and humidity compensation method for improving the accuracy of optical power measurement according to claim 1, wherein the step 2 comprises the steps of:
step 2.1, initializing an optical power predicted value of the target optical power meter;
step 2.2, predicting the optical power value at the next moment and collecting the optical power measured value at the next moment;
step 2.3, calculating a state gain factor according to the predicted value of the optical power at the next moment;
step 2.4, calculating a prediction error value according to the optical power measured value at the next moment and the optical power predicted value at the next moment;
and 2.5, calculating the output light power value according to the prediction error value and the state gain factor.
6. The temperature and humidity compensation method for improving the accuracy of optical power measurement according to claim 5, wherein the step 2.1 is as follows:
searching a corresponding optical power calibration value according to the current temperature and humidity and the electric signal acquired by the target optical power meter, and calculating the optical power measurement value P at the current momentv＝HPkmnInitial optical power prediction value Pe＝PvInitialization state covariance factor VeWherein H is a measured transfer factor.
7. The temperature and humidity compensation method for improving the accuracy of optical power measurement according to claim 6, wherein the step 2.2 is as follows:
predicting the optical power value P at the next momente1＝G*Pe+ W, its corresponding state covariance factor V at the next time instante1＝G*Ve*GT+ Q, according to the humiture at next moment and the electric signal collected by the target optical power meter, searching the corresponding optical power calibration value, and calculating the optical power measurement value P at next momentv1＝HPkmn1Wherein G is an estimated state transition factor, W is an external disturbance term, Q is an external disturbance covariance factor, VeIs a state covariance factor, PeIs the initial light power prediction value, H is the measured transfer factor, Pkmn1The output power of a light source is (11-k) dBm, the temperature at the next moment is 0.5(m-1) DEG C, and the optical power of a target optical power meter is calibrated under the condition that the humidity is (20+ n-1)%, wherein m is 1, 2. n is 1, 2, 41,k＝1，2，...，91。
8. the temperature and humidity compensation method for improving the accuracy of optical power measurement according to claim 5, wherein the step 2.3 is as follows:
calculating the state gain factor K ═ Pe1*(H*Pe1*HT)-1Wherein P ise1The predicted value of the optical power at the next moment is H, and the measurement transfer factor is H.
9. The temperature and humidity compensation method for improving the accuracy of optical power measurement according to claim 5, wherein the step 2.4 is as follows:
calculating a prediction error value error ═ Pv1-H*Pe1Wherein P ise1Is the predicted value of optical power at the next moment, H is the measured transfer factor, Pv1Is the optical power measurement at the next time instant.
10. The temperature and humidity compensation method for improving the accuracy of optical power measurement according to claim 5, wherein the step 2.5 is as follows:
calculating the output light power value Po＝Pe1+ K error, its corresponding output state covariance factor Vo＝(1-K*H)*Pe1Wherein P ise1The predicted value of the optical power at the next moment is H, the measurement transfer factor is H, the state gain factor is K, and the error value is error.
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