CN-122016269-A - Rotating shaft abnormality testing system and method based on tunable laser

CN122016269ACN 122016269 ACN122016269 ACN 122016269ACN-122016269-A

Abstract

The application belongs to the technical field of tunable lasers, and particularly relates to a rotating shaft abnormality testing system and method based on a tunable laser, wherein the rotating shaft abnormality testing system comprises a spectrum analyzer, an optical switch, an optical wavelength meter and a calculation module; the application takes the mode-jump-free tunable laser as a testing device, tests whether the rotating shaft for the tunable laser is abnormal (such as jamming, crush injury or abnormal sound, and the like), and automatically analyzes the obtained resonant output wavelength testing result, thereby obtaining the optimal tunable output interval which can be realized by the rotating shaft to be tested, and realizing the accurate screening of the non-abnormal rotating shaft which is suitable for the assembly of the tunable laser based on the optimal tunable output interval.

Inventors

SHENG LIWEN
HUANG LIN
LIU ZHIMING
WANG JIANJUN
QIAO SHAN
JU JUNWEI
ZHOU SHUAI
YIN BINGQI
LANG JINPENG

Assignees

中电科思仪科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251229

Claims (8)

1. The rotating shaft abnormality testing system based on the tunable laser is characterized by comprising a spectrum analyzer, an optical switch, an optical wavelength meter and a calculation module; The optical switch is used for realizing the separation of the output optical signals of the tunable laser of the gain module in the tunable laser; The spectrum analyzer is used for testing the output spectrum of the gain module when the optical switch is positioned in the first channel so as to realize the measurement of the external cavity mode interval of the tunable laser; the optical wavelength meter is used for testing output wavelength values of the feedback module at different positions in the tunable laser by the gain module when the optical switch is positioned in the second channel; The calculation module is used for programming the gain module, the feedback module, the optical switch, the spectrum analyzer and the optical wavelength meter which are connected.
2. The tunable laser-based rotating shaft abnormality test system according to claim 1, wherein n wave peaks are read after a T1 test time when the optical switch is in the first channel, n is an odd number, (n+1)/2 is an intermediate wave peak marked as , The two adjacent wave peak values at the left are respectively 、 ; The two adjacent wave peak values at the right are respectively 、 Calculating the difference value PL1, PR1 of the two adjacent peak wavelengths on the left and right, wherein PL1 = - ,PR1= - And calculating the Mode interval Mode of the tunable laser external cavity, wherein mode= (PL1+PR 1)/2.
3. The rotating shaft abnormality test system based on the tunable laser according to claim 1, wherein when the optical switch is in the second channel, the calculation unit issues a reset signal Rset1 to the feedback module, and after a time T2, continuously issues a step signal to move around the rotating shaft point by St stroke distance; the calculation unit reads the output wavelength value Wave 0~i of the tunable laser under the i St motion distance in real time, wherein i is the number of the issued step signals; Judging whether the < Mode/p is satisfied or not, if so, continuing to read the wavelength values until i wavelength values are scanned, otherwise, the computing unit sends a Stop signal Stop1 to the feedback module; Calculating whether Wave [ i ] -Wave [ i-1] < Mode is established, if yes, the rotating shaft to be measured is normal, adapting to the tunable laser, the tunable output range is Ran, ran=wave [ i ] -Wave [0], otherwise, searching partial section adapting to the tunable laser by using peak searching algorithm.
4. The rotating shaft abnormality testing method based on the tunable laser is characterized by comprising the following steps of: s1, testing; s2, switching the optical switch to a first channel; S3, the spectrum analyzer starts scanning, and the scanning start and stop wavelengths are Wstart and Wend respectively in the period T1; S4, calculating the mode interval of the tunable laser external cavity according to the wave crest value; s5, switching the optical switch to a second channel; S6, moving around the rotating shaft point by using the feedback module to obtain the output wavelength value of the tunable laser, and judging that the rotating shaft to be tested is normal by using the output wavelength range value.
5. The method for testing the abnormality of the rotating shaft based on the tunable laser according to claim 4, wherein the s1 test stage comprises: s101, a program control gain module of a calculation module is started and preheated; S102, a calculation module program-controlled optical switch is switched to a first channel; S103, a calculation module programs the spectrum analyzer to start and preheat the spectrum analyzer; S104, a calculation module programs a light wavelength meter to start and preheat the light wavelength meter; S105, setting the scanning start-stop wavelength of the calculation module program-controlled spectrum analyzer as Wstart and Wend and the resolution as Res.
6. The method for testing the abnormality of the rotating shaft based on the tunable laser according to claim 4, wherein step S4 calculates the external cavity mode interval of the tunable laser according to the peak value, and comprises the following steps: s401, after T1 test time, n wave peak values are read, n is an odd number, and (n+1)/2 is the middle wave peak value and marked as , The two adjacent wave peak values at the left are respectively 、 ; The two adjacent wave peak values at the right are respectively 、 ; S402, calculating difference values PL1 and PR1 of two adjacent peak wavelengths on the left side and the right side respectively, wherein PL1 = - ,PR1= - ; S403, calculating the Mode interval Mode of the tunable laser external cavity, wherein mode= (PL 1+PR 1)/2.
7. The method for testing the abnormality of the rotating shaft based on the tunable laser according to claim 4, wherein the determining method of S6 is as follows: s601, a calculation unit sends a reset signal Rset1 to a feedback module, and after time T2, continuously sends a step signal to enable the step signal to move around a rotation axis point by St travel distance, and the step S602 is carried out; s602, a calculation unit reads a tunable laser output wavelength value Wave 0~i under the motion distance of i St in real time, wherein i is the number of the issued step signals, and the step S603 is transferred to; s603, judging whether the |wave [ i ] -Wave [ i-1] |mode/p is satisfied, if so, turning to step S602 until i wavelength values are scanned, otherwise, turning to step S604; S604, the computing unit sends a Stop signal Stop1 to the feedback module, and the step S605 is performed; S605, calculating whether Wave [ i ] -Wave [ i-1] < Mode is satisfied, if so, turning to step S606, otherwise turning to step S607; S606, ending, wherein the computing unit gives out a test conclusion that the rotating shaft to be tested is normal and is adapted to the tunable laser, and the achievable tuning output range is Ran, ran=wave [ i ] -Wave [0]; s607, searching for a partial section adapted to the tunable laser by using the peak searching algorithm.
8. The method according to claim 7, wherein step S607 finds a partial section adapted to the tunable laser, concretely as follows S6070, calculating absolute values of adjacent wavelength differences in Wave 0~i to generate a new data set Ab1[0~i-1], and turning to a step S6071; S6071, searching data positions P [ k ] larger than Mode in a data set Ab1[0~i-1] by using a peak searching algorithm, wherein k is the number meeting a judging condition, and taking two endpoint wavelength values generated by the data as tuning intervals Ran1[ jj ] which can be realized by a rotating shaft to be detected, wherein jj is the number of intervals which can exist, and turning to a step S6072; s6072, judging whether the maximum value of the Ran1[ jj ] is larger than a threshold value Thr, if so, turning to a step S6073, otherwise, turning to a step S6074; s6073, ending, wherein the calculation unit gives a test conclusion that the rotating shaft to be tested is abnormal, part of intervals are adapted to the tunable laser, the achievable tuning output range is Ran2, ran2=max (Ran1 [ jj ]), and the step S6075 is carried out; s6074, ending, wherein the calculation unit gives a test conclusion that the rotating shaft to be tested is abnormal and is not suitable for the assembly of the tunable laser, and the step S6075 is carried out; S6075, replacing the rotating shaft to be tested, and repeating the steps S5-S6.

Description

Rotating shaft abnormality testing system and method based on tunable laser Technical Field The application belongs to the technical field of tunable lasers, and particularly relates to a rotating shaft abnormality testing system and method based on a tunable laser. Background The existing rotating shaft abnormality detection method often depends on the technical means such as finger rotation, temperature monitoring, vibration monitoring and sound monitoring, and the like, so that the source of the rotating shaft state parameter test data for the tunable laser is single, the test process is complex and low-efficiency, and the risk that larger errors are introduced in the data analysis and post-processing process exists. In addition, the test mode is separated from the actual working environment of the tunable laser, and the difficulty that whether the threshold value is hard to accurately determine is existed in the presence or absence of the abnormal rotating shaft. Therefore, it has been difficult for the conventional method to meet the requirement of detecting the abnormality of the rotating shaft for the tunable laser, especially for the production and manufacturing process facing the complex use environment. Disclosure of Invention In view of this, the invention provides a rotating shaft abnormality testing system and method based on a tunable laser, which is suitable for precisely screening non-abnormal rotating shafts assembled by the tunable laser, and the technical scheme is as follows: a rotating shaft abnormality testing system based on a tunable laser comprises a spectrum analyzer, an optical switch, an optical wavelength meter and a calculation module; The optical switch is used for realizing the separation of the output optical signals of the tunable laser of the gain module in the tunable laser; The spectrum analyzer is used for testing the output spectrum of the gain module when the optical switch is positioned in the first channel so as to realize the measurement of the external cavity mode interval of the tunable laser; the optical wavelength meter is used for testing output wavelength values of the feedback module at different positions in the tunable laser by the gain module when the optical switch is positioned in the second channel; The calculation module is used for programming the gain module, the feedback module, the optical switch, the spectrum analyzer and the optical wavelength meter which are connected. Preferably, n peak values are read after T1 test time when the optical switch is in the first channel, n is odd, and (n+1)/2 is marked as an intermediate peak value,The two adjacent wave peak values at the left are respectively、;The two adjacent wave peak values at the right are respectively、Calculating the difference value PL1, PR1 of the two adjacent peak wavelengths on the left and right, wherein PL1 =-,PR1=-And calculating the Mode interval Mode of the tunable laser external cavity, wherein mode= (PL1+PR 1)/2. Preferably, when the optical switch is in the second channel, the calculating unit sends a reset signal Rset1 to the feedback module, and after the time T2, continuously sends a step signal to enable the optical switch to move around the rotating shaft point by the St stroke distance; the calculation unit reads the output wavelength value Wave 0~i of the tunable laser under the i St motion distance in real time, wherein i is the number of the issued step signals; Judging whether the < Mode/p is satisfied or not, if so, continuing to read the wavelength values until i wavelength values are scanned, otherwise, the computing unit sends a Stop signal Stop1 to the feedback module; calculating whether Wave [ i ] -Wave [ i-1] < Mode is established, if yes, the rotating shaft to be measured is normal, adapting to the tunable laser, the tunable output range is Ran, ran=wave [ i ] -Wave [0], otherwise, searching partial section adapting to the tunable laser by using peak searching algorithm. A rotating shaft abnormality testing method based on a tunable laser comprises the following steps: s1, testing; s2, switching the optical switch to a first channel; S3, the spectrum analyzer starts scanning, and the scanning start and stop wavelengths are Wstart and Wend respectively in the period T1; S4, calculating the mode interval of the tunable laser external cavity according to the wave crest value; s5, switching the optical switch to a second channel; S6, moving around the rotating shaft point by using the feedback module to obtain the output wavelength value of the tunable laser, and judging that the rotating shaft to be tested is normal by using the output wavelength range value. Preferably, the s1. Test phase comprises: s101, a program control gain module of a calculation module is started and preheated; S102, a calculation module program-controlled optical switch is switched to a first channel; S103, a calculation module programs the spectrum analyzer to start and preheat the spec