CN114526815B - Temperature and humidity compensation method for improving optical power measurement accuracy - Google Patents
Temperature and humidity compensation method for improving optical power measurement accuracy Download PDFInfo
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- CN114526815B CN114526815B CN202210115353.0A CN202210115353A CN114526815B CN 114526815 B CN114526815 B CN 114526815B CN 202210115353 A CN202210115353 A CN 202210115353A CN 114526815 B CN114526815 B CN 114526815B
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- 238000005259 measurement Methods 0.000 title claims abstract description 62
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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
- G01J1/02—Details
- G01J1/0228—Control of working procedures; Failure detection; Spectral bandwidth calculation
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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
- 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
- G01J1/02—Details
- G01J1/0295—Constructional arrangements for removing other types of optical noise or for performing calibration
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Abstract
The invention discloses a temperature and humidity compensation method for improving the accuracy of optical power measurement, which comprises the following steps: calibrating the power values of the target optical power meter under different temperature and humidity conditions and different output powers of the light source by using the measurement data of the standard optical power meter to obtain an optical power calibration value; collecting an optical power measured value at the next moment according to the optical power calibration value, predicting the 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 value and the output state covariance factor is smaller than a second set threshold value, 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 optical power measurement accuracy.
Background
The optical power meter is used as an important component in light wave measurement, the measurement accuracy of the optical power meter can have a great influence on the measurement result, the temperature and the humidity can influence the measurement accuracy of the optical power meter, the influence degree of different temperature and humidity on the measurement accuracy is different, the temperature and the humidity simultaneously act on the optical power meter, and the measurement trend of the optical power is different from the situation that only one of the temperature or the humidity is considered to act on the optical power meter. If the collected power value is directly used as a final measured value, the optical power meter cannot respond to the change of temperature and humidity in time, so that the measuring speed is affected, and the optical power meter is not suitable for occasions such as high-speed measurement.
In the prior art, the influence of two factors of temperature and humidity on the measurement accuracy of the power meter is not considered, and the measured 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, and the temperature and humidity compensation method is used for compensating the temperature and humidity of the measurement result of an optical power meter.
In order to achieve the above 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 power values of a target optical power meter under different temperature and humidity conditions and different output powers of a light source by using measurement data of a standard optical power meter to obtain an optical power calibration value;
step 2, acquiring an optical power measurement value at the next moment according to the optical power calibration value, predicting the optical power value at the next moment to obtain an optical power prediction value at the next moment, and calculating an output optical power value and a corresponding output state covariance factor according to the optical power measurement value at the next moment and the optical power prediction value at the next moment;
and step 3, 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 value and the output state covariance factor is smaller than a second set threshold value, and outputting a final optical power value, otherwise, returning to step 2.
In the above scheme, the step 1 includes the following steps:
step 1.1, measuring the optical power values under different temperature and humidity environments by using a standard optical power meter;
and 1.2, adjusting the output light power value of the light source, and 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 different temperature and humidity environments measured by the standard light power meter to obtain a light power calibration value.
In a further technical scheme, the step 1.1 is specifically as follows:
regulating the output light power value of 1550nm light source to 10dBm under the reference environment with the temperature of 0 ℃ and the humidity of 20%, and measuring the light power value P under the corresponding condition by using a standard light power meter under the different temperature and humidity conditions with the temperature of 0-40 ℃ and the humidity of 20-60% 1mn Wherein P is 1mn The output power of the light source under the reference environment is 10dBm, the temperature at the current moment is 0.5 (m-1) DEG C, and the light power value measured by a standard light power meter under the condition that the humidity is (20+n-1)%, m=1, 2, 81; n=1, 2..41, temperature interval of 0.5 ℃, humidity interval of 1%.
In a further technical scheme, the step 1.2 specifically comprises the following steps:
adjusting the output optical power value of the light source to be-80-10 dBm, adjusting the adjustment interval to be 1dB, and calibrating the optical power value P of the target optical power meter corresponding to the output power kmn ＝P 1mn -k+1，P kmn The light power calibration value, P, of the target light power meter is set to be (11-k) dBm, the temperature is 0.5 (m-1) DEG C, and the humidity is (20+n-1)% 1mn The output power of the light source under the reference environment is 10dBm, the temperature is 0.5 (m-1) DEG C, the light power value measured by a standard light power meter under the condition that the humidity is (20+n-1)%, and m=1, 2, 81; n=1, 2,..41, k=1, 2,..91.
In the above scheme, the step 2 includes the following steps:
step 2.1, initializing an optical power predicted value of a 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 optical power predicted value 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 an output optical 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:
according to the current temperature and humidity and the electric signal acquired by the target optical power meter, searching a corresponding optical power calibration value, and calculating an optical power measurement value P at the current moment v ＝HP kmn Initial optical power prediction value P e ＝P v Initializing a state covariance factor V e Wherein H is a measurement transfer factor.
In a further technical scheme, the step 2.2 is specifically as follows:
predicting the optical power value P at the next moment e1 ＝G*P e +W, the corresponding state covariance factor V at the next moment e1 ＝G*V e *G T +Q, searching corresponding optical power calibration value according to the temperature and humidity at the next moment and the electric signal acquired by the target optical power meter, and calculating the optical power measurement value P at the next moment v1 ＝HP kmn1 Wherein G is an estimated state transfer factor, W is an external disturbance term, Q is an external disturbance covariance factor, V e Is the state covariance factor, P e For the initial optical power predicted value, H is the measurement transfer factor, P kmn1 For a light source output power of (11-k) dBm, a temperature of 0.5 (m-1) deg.c at the next moment, and an optical power calibration value of the target optical power meter under the condition that humidity is (20+n-1)%, m=1, 2, 81; n=1, 2,..41, k=1, 2,..91. .
In a further technical scheme, the step 2.3 is specifically as follows:
calculating a state gain factor k=p e1 *(H*P e1 *H T ) -1 Wherein P is e1 And H is a measurement transfer factor, and is the predicted value of the optical power at the next moment.
In a further technical scheme, the step 2.4 is specifically as follows:
calculating a prediction error value error=p v1 -H*P e1 Wherein P is e1 For the predicted value of the optical power at the next moment, H is the measurement transfer factor, P v1 Is the optical power measurement at the next moment.
In a further technical scheme, the step 2.5 is specifically as follows:
calculating the output optical power value P o ＝P e1 +K error, its corresponding output state covariance factor V o ＝(1-K*H)*P e1 Wherein P is e1 And H is a measurement transfer factor, K is a state gain factor, and error is a prediction error value.
Through the technical scheme, the temperature and humidity compensation method for improving the accuracy of optical power measurement has the following beneficial effects:
the invention compensates the actually measured optical power value according to the optical power calibration values of different temperature and humidity conditions, adopts a method of real-time observation and correction, and increases the measurement accuracy of the optical power meter. 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, can quickly respond to the influence of temperature and humidity on the optical power meter, and can be applied to scenes such as severe environment metering.
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 accuracy of optical power measurement according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of step 2 in the embodiment of the present invention.
Detailed Description
The technical solutions 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 is shown in figure 1 and comprises the following steps:
step 1, calibrating power values of a target optical power meter under different temperature and humidity conditions and different output powers 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 the optical power values under different temperature and humidity environments by using a standard optical power meter, wherein the specific steps are as follows:
regulating the output light power value of 1550nm light source to 10dBm under the reference environment with the temperature of 0 ℃ and the humidity of 20%, and measuring the light power value P under the corresponding condition by using a standard light power meter under the different temperature and humidity conditions with the temperature of 0-40 ℃ and the humidity of 20-60% 1mn Wherein P is 1mn The output power of the light source under the reference environment is 10dBm, the temperature is 0.5 (m-1) DEG C, the light power value measured by a standard light power meter under the condition that the humidity is (20+n-1)%, and m=1, 2, 81; n=1, 2..41, temperature interval of 0.5 ℃, humidity interval of 1%.
Step 1.2, adjusting the output light power value of a light source, calibrating the light power value of a target light power meter corresponding to different output power under different temperature and humidity environments according to the light power value under different temperature and humidity environments measured by a standard light power meter, and obtaining a light power calibration value, wherein the specific steps are as follows:
adjusting the output optical power value of the light source to be-80-10 dBm, adjusting the adjustment interval to be 1dB, and calibrating the optical power value P of the target optical power meter corresponding to the output power kmn ＝P 1mn -k+1，P kmn The light power calibration value of the target light power meter under the condition that the light source output power is (11-k) dBm, the current time temperature is 0.5 (m-1) DEG C and the humidity is (20+n-1)%, P 1mn The output power of the light source under the reference environment is 10dBm, the temperature is 0.5 (m-1) DEG C, the light power value measured by a standard light power meter under the condition that the humidity is (20+n-1)%, and m=1, 2, 81; n=1, 2,..41, k=1, 2,..91.
Step 2, acquiring an optical power measurement value at the next moment according to the optical power calibration value, predicting the optical power value at the next moment to obtain an optical power prediction value at the next moment, and calculating an output optical power value and a corresponding output state covariance factor according to the optical power measurement value at the next moment and the optical power prediction value at the next moment;
as shown in fig. 2, the method specifically comprises the following steps:
step 2.1, initializing an optical power predicted value of a target optical power meter, wherein the method specifically comprises the following steps:
according to the current temperature and humidity and the electric signal acquired by the target optical power meter, searching a corresponding optical power calibration value, and calculating an optical power measurement value P at the current moment v ＝HP kmn Initial optical power prediction value P e ＝P v Initializing a state covariance factor V e Wherein H is a measurement transfer factor, and in a simulation experiment, V e ＝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, wherein the method specifically comprises the following steps:
predicting the optical power value P at the next moment e1 ＝G*P e +W, the corresponding state covariance factor V at the next moment e1 ＝G*V e *G T +Q, searching corresponding optical power calibration value according to the temperature and humidity at the next moment and the electric signal acquired by the target optical power meter, and calculating the optical power measurement value P at the next moment v1 ＝HP kmn1 Wherein G is an estimated state transfer factor, W is an external disturbance term, Q is an external disturbance covariance factor, V e Is the state covariance factor, P e For the initial optical power predicted value, H is the measurement transfer factor, P kmn1 In the simulation experiment, g=1, w=0, h=1 and q=0.01, the light power calibration value of the target light power meter is obtained when the light source output power is (11-k) dBm, the temperature is 0.5 (m-1) DEG C at the next moment, and the humidity is (20+n-1)%.
And 2.3, calculating a state gain factor according to the optical power predicted value at the next moment, wherein the state gain factor is specifically as follows:
calculating a state gain factor k=p e1 *(H*P e1 *H T ) -1 Wherein P is e1 H is a measurement transfer factor, and in the simulation experiment, h=1.
And 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 of:
calculating a prediction error value error=p v1 -H*P e1 Wherein P is e1 Is as followsThe predicted value of the optical power at one moment, H is the measurement transfer factor, P v1 For the optical power measurement at the next time, h=1 in the simulation experiment.
And 2.5, calculating an output light power value according to the prediction error value and the state gain factor, wherein the method comprises the following steps of:
calculating the output optical power value P o ＝P e1 +K error, its corresponding output state covariance factor V o ＝(1-K*H)*P e1 Wherein P is e1 And H is a measurement transfer factor, K is a state gain factor, and error is a prediction error value.
And step 3, 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 value and the output state covariance factor is smaller than a second set threshold value, and outputting a final optical power value, otherwise, returning to step 2.
The specific method comprises the following steps:
calculate output error errm=p o -P v1 If errm < 0.02, and V o < 0.5, then P f ＝P o No person P f ＝P f The method comprises the steps of carrying out a first treatment on the surface of the Turning to step 2, wherein P f For the final optical power value, P o To output the optical power value, V o Is 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 (4)
1. The temperature and humidity compensation method for improving the accuracy of optical power measurement is characterized by comprising the following steps of:
step 1, calibrating power values of a target optical power meter under different temperature and humidity conditions and different output powers of a light source by using measurement data of a standard optical power meter to obtain an optical power calibration value;
step 2, acquiring an optical power measurement value at the next moment according to the optical power calibration value, predicting the optical power value at the next moment to obtain an optical power prediction value at the next moment, and calculating an output optical power value and a corresponding output state covariance factor according to the optical power measurement value at the next moment and the optical power prediction value at the next moment;
step 3, 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 value and the output state covariance factor is smaller than a second set threshold value, and outputting a final optical power value, otherwise returning to the step 2;
the step 2 comprises the following steps:
step 2.1, initializing an optical power predicted value of a 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 optical power predicted value 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;
step 2.5, calculating an output light power value according to the prediction error value and the state gain factor;
the step 2.1 is specifically as follows:
according to the current temperature and humidity and the electric signal acquired by the target optical power meter, searching a corresponding optical power calibration value, and calculating an optical power measurement value P at the current moment v ＝HP kmn Initial optical power prediction value P e ＝P v Initializing a state covariance factor V e Wherein H is a measurement transfer factor; p (P) kmn For a light source output power of (11-k) dBm, a current time temperature of 0.5 (m-1) deg.c, and a target optical power meter optical power calibration value under the condition of humidity of (20+n-1)%, m=1, 2, 81; n=1, 2,..41, k=1,2，...，91；
the step 2.2 is specifically as follows:
predicting the optical power value P at the next moment e1 ＝G*P e +W, the corresponding state covariance factor V at the next moment e1 ＝G*V e *G T +Q, searching corresponding optical power calibration value according to the temperature and humidity at the next moment and the electric signal acquired by the target optical power meter, and calculating the optical power measurement value P at the next moment v1 ＝HP kmn1 Wherein G is an estimated state transfer factor, W is an external disturbance term, Q is an external disturbance covariance factor, V e Is the state covariance factor, P e For the initial optical power predicted value, H is the measurement transfer factor, P kmn1 For a light source output power of (11-k) dBm, a temperature of 0.5 (m-1) deg.c at the next moment, and an optical power calibration value of the target optical power meter under the condition that humidity is (20+n-1)%, m=1, 2, 81; n=1, 2,..41, k=1, 2,..91;
the step 2.3 is specifically as follows:
calculating a state gain factor k=p e1 *(H*P e1 *H T ) -1 Wherein P is e1 H is a measurement transfer factor, which is the predicted value of the optical power at the next moment;
the step 2.4 is specifically as follows:
calculating a prediction error value error=p v1 -H*P e1 Wherein P is e1 For the predicted value of the optical power at the next moment, H is the measurement transfer factor, P v1 For the optical power measurement at the next moment;
the step 2.5 is specifically as follows:
calculating the output optical power value P o ＝P e1 +K error, its corresponding output state covariance factor V o ＝(1-K*H)*P e1 Wherein P is e1 And H is a measurement transfer factor, K is a state gain factor, and error is a prediction error value.
2. The temperature and humidity compensation method for improving accuracy of optical power measurement according to claim 1, wherein the step 1 comprises the following steps:
step 1.1, measuring the optical power values under different temperature and humidity environments by using a standard optical power meter;
and 1.2, adjusting the output light power value of the light source, and 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 different temperature and humidity environments measured by the standard light power meter to obtain a light power calibration value.
3. The temperature and humidity compensation method for improving accuracy of optical power measurement according to claim 2, wherein the step 1.1 specifically comprises the following steps:
regulating the output light power value of 1550nm light source to 10dBm under the reference environment with the temperature of 0 ℃ and the humidity of 20%, and measuring the light power value P under the corresponding condition by using a standard light power meter under the different temperature and humidity conditions with the temperature of 0-40 ℃ and the humidity of 20-60% 1mn Wherein P is 1mn The light power value measured by a standard light power meter under the conditions that the light source output power is 10dBm, the temperature is 0.5 (m-1) DEG C, and the humidity is (20+n-1)%, and m=1, 2. n=1, 2..41, temperature interval of 0.5 ℃, humidity interval of 1%.
4. The temperature and humidity compensation method for improving accuracy of optical power measurement according to claim 2, wherein the step 1.2 is specifically as follows:
adjusting the output optical power value of the light source to be-80-10 dBm, adjusting the adjustment interval to be 1dB, and calibrating the optical power value P of the target optical power meter corresponding to the output power kmn ＝P 1mn -k+1，P kmn The light power calibration value of the target light power meter under the condition that the light source output power is (11-k) dBm, the current time temperature is 0.5 (m-1) DEG C and the humidity is (20+n-1)%, P 1mn The light power value measured by a standard light power meter under the conditions that the light source output power is 10dBm, the temperature is 0.5 (m-1) DEG C, and the humidity is (20+n-1)%, and m=1, 2. n=1, 2,..41, k=1, 2,..91.
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