CN112344974B - Phase demodulation system and demodulation method for interference type optical fiber sensor - Google Patents

Phase demodulation system and demodulation method for interference type optical fiber sensor Download PDF

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CN112344974B
CN112344974B CN202011134104.3A CN202011134104A CN112344974B CN 112344974 B CN112344974 B CN 112344974B CN 202011134104 A CN202011134104 A CN 202011134104A CN 112344974 B CN112344974 B CN 112344974B
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phase demodulation
differentiation
phase
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CN112344974A (en
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陆星
李鹏
秦杰
柏楠
万双爱
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Beijing Automation Control Equipment Institute BACEI
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    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement

Abstract

The invention relates to the technical field of laser and optical fiber sensing, and discloses a phase demodulation system and a phase demodulation method for an interference type optical fiber sensor. The system comprises: a differential module for performing differential operation on any two paths of outputs of the 3 × 3 coupler of the interference type optical fiber sensor to obtain a first differential result D1And a second differentiation result D2(ii) a An adder connected to the differentiating unit for adding the first differentiation result D1And a second differentiation result D2Performing addition operation to obtain an addition result P; a subtractor connected with the differentiation unit for differentiating the first differentiation result D1Subtracting the second differentiation result D2Obtaining a subtraction result S; the divider is connected with the adder and the subtracter and divides the addition result P by the subtraction result S to obtain a division result C; the multiplier is connected with the divider and is used for multiplying the division result C and a preset constant to obtain a multiplication result M; an arc tangent arithmetic unit connected with the multiplier for performing arc tangent operation on the multiplication result M to obtain a phase demodulation result Z0。

Description

Phase demodulation system and demodulation method for interference type optical fiber sensor
Technical Field
The invention relates to the technical field of laser and optical fiber sensing, in particular to a phase demodulation system and a phase demodulation method for an interference type optical fiber sensor.
Background
The interference type optical fiber sensor is a type of optical fiber sensor for information perception by using optical phase change, has extremely high sensitivity, and is widely applied to the fields of aerospace, earthquake monitoring, petroleum industry and the like.
The 3 x 3 coupler demodulation method is an important method for demodulating the interference type optical fiber sensor, the core of the method is multi-phase detection, the problem of phase random fading can be effectively solved, no modulation device is needed, the related optical path is simple, and the demodulation dynamic range is large. However, this method usually relies on the three-way output of the 3 × 3 coupler, i.e. three photodetectors are required for demodulation of the three-way output, which undoubtedly increases the cost and is not favorable for further popularization and application of the interferometric fiber sensor.
Disclosure of Invention
The present invention is directed to overcome the deficiencies of the prior art, and provides a phase demodulation system and a phase demodulation method for an interferometric fiber sensor, which can solve the problems in the prior art.
The technical solution of the invention is as follows: a phase demodulation system for an interferometric fiber optic sensor, wherein the system comprises:
a differential module for performing differential operation on any two paths of outputs of the 3 × 3 coupler of the interference type optical fiber sensor to obtain a first differential result D1And a second differentiation result D2；
An adder connected to the differentiating unit for differentiating the first differentiation result D1And a second differentiation result D2Performing addition operation to obtain an addition result P;
a subtractor connected to the differentiating unit for differentiating the first differentiation result D1Subtracting the second differentiation result D2Obtaining a subtraction result S;
the divider is connected with the adder and the subtracter and is used for dividing the addition result P by the subtraction result S to obtain a division result C;
the multiplier is connected with the divider and used for multiplying the division result C and a preset constant to obtain a multiplication result M;
an arc tangent arithmetic unit connected with the multiplier and used for carrying out arc tangent operation on the multiplication result M to obtain a phase demodulation result Z0。
Preferably, the system further comprises a correction module, connected to the arctangent operator, for correcting the phase demodulation result Z0And a phase demodulation result Z obtained by increasing the phase difference of the two arms of the interference type optical fiber sensor0nMaking a comparison if the phase demodulation result Z is0nLess than phase demodulation result Z0Then the phase demodulation result Z0Multiplying by-1 to obtain final phase demodulation result Z, and if the phase demodulation result Z is0nGreater than phase demodulation result Z0Then directly demodulating the phase demodulation result Z0As the final phase demodulation result Z output.
Preferably, the differential module includes a first differentiator and a second differentiator, where the first differentiator is configured to perform a differential operation on one of the two arbitrary outputs of the 3 × 3 coupler to obtain a first differential result D1The second differentiator is used for carrying out differential operation on the other output of the two arbitrary paths of outputs of the 3 multiplied by 3 coupler to obtain a second differential result D2。
Preferably, the predetermined constant is
Figure BDA0002736105440000021
The invention also provides a phase demodulation method for the interference type optical fiber sensor, wherein the method comprises the following steps:
respectively carrying out differential operation on any two paths of outputs of the 3 multiplied by 3 coupler of the interference type optical fiber sensor to obtain a first differential result D1And a second differentiation result D2；
To the first differentiation result D1And a second differentiation result D2Performing addition operation to obtain an addition result P;
the first differentiation result D1Subtracting the second differentiation result D2Obtaining a subtraction result S;
dividing the addition result P by the subtraction result S to obtain a division result C;
multiplying the division result C by a preset constant to obtain a multiplication result M;
performing arc tangent operation on the multiplication result M to obtain a phase demodulation result Z0。
Preferably, the method further comprises:
demodulating the phase of the result Z0And a phase demodulation result Z obtained by increasing the phase difference of the two arms of the interference type optical fiber sensor0nComparing;
if the phase demodulation result Z0nLess than phase demodulation result Z0Then the phase demodulation result Z0Multiplying the result by-1 to obtain a final phase demodulation result Z and outputting the final phase demodulation result Z;
if the phase demodulation result Z0nGreater than phase demodulation result Z0Then directly demodulating the phase demodulation result Z0As the final phase demodulation result Z output.
Preferably, the predetermined constant is
Figure BDA0002736105440000031
By the technical scheme, the phase demodulation of the interference type optical fiber sensor can be completed only by utilizing two paths of output of the 3 multiplied by 3 coupler, so that the using quantity of the photoelectric detectors in the phase demodulation process is reduced, and the cost is effectively reduced. In addition, the invention does not need to use high-pass filtering to eliminate direct current components, does not limit the low-frequency response of the system, and has the advantages of simplicity, high efficiency and easy implementation.
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The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a block diagram of a phase demodulation system for an interferometric fiber optic sensor according to an embodiment of the present invention;
fig. 2 is a flowchart of a phase demodulation method for an interferometric fiber sensor according to an embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, for purposes of explanation and not limitation, specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the device structures and/or processing steps that are closely related to the scheme according to the present invention are shown in the drawings, and other details that are not so relevant to the present invention are omitted.
Fig. 1 is a block diagram of a phase demodulation system for an interferometric fiber sensor according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a phase demodulation system for an interferometric fiber sensor, wherein the system includes:
a differential module for performing differential operation on any two paths of outputs of the 3 × 3 coupler of the interference type optical fiber sensor to obtain a first differential result D1And a second differentiation result D2；
That is, the differential module performs differential operation on any two paths of outputs of the 3 × 3 coupler respectively to output a first differential result D1And a second differentiation result D2。
An adder 10 connected to the differentiating unit for adding the first differentiation result D1And a second differentiation result D2Performing addition operation to obtain an addition result P;
that is, the adder performs addition and outputs the addition result P.
A subtractor 12 connected to the differentiating unit for differentiating the first differentiation result D1Subtracting the second differentiation result D2Obtaining a subtraction result S;
that is, the subtractor performs subtraction to output a subtraction result S.
A divider 14, connected to the adder 10 and the subtractor 12, for dividing the addition result P by the subtraction result S to obtain a division result C;
that is, the divider performs a division operation to output a division result C.
The multiplier 16 is connected with the divider 14 and is used for performing multiplication operation on the division result C and a predetermined constant to obtain a multiplication result M;
that is, the multiplier performs multiplication to output a multiplication result M.
An arc tangent operator 18 connected to the multiplier 16 for performing an arc tangent operation on the multiplication result M to obtain a phase demodulation result Z0。
That is, the arctangent operator outputs the phase demodulation result Z by the arctangent operation0。
By the technical scheme, the phase demodulation of the interference type optical fiber sensor can be completed only by utilizing two paths of output of the 3 multiplied by 3 coupler, so that the using quantity of the photoelectric detectors in the phase demodulation process is reduced, and the cost is effectively reduced. In addition, the invention does not need to use high-pass filtering to eliminate direct current components, does not limit the low-frequency response of the system, and has the advantages of simplicity, high efficiency and easy implementation.
According to an embodiment of the present invention, the system further comprises a correction module 20 connected to the arctan operator 18 for demodulating the phase Z0And a phase demodulation result Z obtained by increasing the phase difference of the two arms of the interference type optical fiber sensor0nMaking a comparison if the phase demodulation result Z is0nLess than phase demodulation result Z0Then the phase demodulation result Z0Multiplying by-1 to obtain final phase demodulation result Z, and if the phase demodulation result Z is0nGreater than phase demodulation result Z0Then directly demodulating the phase demodulation result Z0As the final phase demodulation result Z output.
That is, the correction module determines the sign of the phase demodulation result Z0 to obtain the final phase demodulation result Z: if Z is0nLess than Z0Then, in the correction module, for Z0Multiplying by-1 and outputting to obtain final phase demodulation result Z, and then all correcting modules are used for demodulating the input phase demodulation result Z0Multiplying by-1 and outputting; if Z is0nGreater than Z0Then, in the correction module, Z is directly output0Obtaining a final phase demodulation result Z, and then the correction module performs phase demodulation on the input phase demodulation result Z0Are directly output.
Wherein, the phase difference of two arms of the interference type optical fiber sensor is increased to obtain a phase demodulation result Z0nAnd obtaining a phase demodulation result Z0The method is the same, and is not described herein again.
According to an embodiment of the present invention, the differentiating module includes a first differentiator 22 and a second differentiator 24, the first differentiator 22 is configured to perform a differentiation operation on one of the two arbitrary outputs of the 3 × 3 coupler to obtain a first differentiation result D1The second differentiator 24 is configured to perform a differentiation operation on the other output of the two arbitrary outputs of the 3 × 3 coupler to obtain a second differentiation result D2。
According to an embodiment of the invention, the predetermined constant is
Figure BDA0002736105440000061
The access relationship of each module in the system of the present invention is further described below. Wherein, any two paths of outputs of the 3 × 3 coupler are respectively connected to the input ends of the first differentiator 22 and the second differentiator 24; the output end of the first differentiator 22 and the output end of the second differentiator 24 are connected to the input end of the subtracter 12, and meanwhile, the output end of the first differentiator 22 and the output end of the second differentiator 24 are connected to the input end of the adder 10; the output end of the subtracter 12 and the output end of the adder 10 are connected to the input end of the divider 14; the output of the divider 14 and a predetermined constant are coupled to the input of the multiplier 16; the output end of the multiplier 16 is connected to the input end of an arc tangent arithmetic unit 18; the output end of the arc tangent arithmetic unit 18 is connected to the input end of the correction module 20; the calibration module 20 outputs the final phase to be measured (i.e., outputs the final phase demodulation result Z).
Fig. 2 is a flowchart of a phase demodulation method for an interferometric fiber sensor according to an embodiment of the present invention.
As shown in fig. 2, an embodiment of the present invention further provides a phase demodulation method for an interferometric fiber sensor, where the method includes:
s100, for the interference type optical fiber sensorAny two paths of outputs of the 3 multiplied by 3 coupler are respectively subjected to differential operation to obtain a first differential result D1And a second differentiation result D2；
S102, the first differentiation result D1And a second differentiation result D2Performing addition operation to obtain an addition result P;
s104, the first differentiation result D is processed1Subtracting the second differentiation result D2Obtaining a subtraction result S;
s106, dividing the addition result P by the subtraction result S to obtain a division result C;
s108, multiplying the division result C by a preset constant to obtain a multiplication result M;
s110, performing arc tangent operation on the multiplication result M to obtain a phase demodulation result Z0。
By the technical scheme, the phase demodulation of the interference type optical fiber sensor can be completed only by utilizing two paths of outputs of the 3X 3 coupler, so that the using quantity of the photoelectric detectors in the phase demodulation process is reduced, and the cost is effectively reduced. In addition, the invention does not need to use high-pass filtering to eliminate direct current components, does not limit the low-frequency response of the system, and has the advantages of simplicity, high efficiency and easy implementation.
According to an embodiment of the invention, the method further comprises:
demodulating the phase of the result Z0And a phase demodulation result Z obtained by increasing the phase difference of the two arms of the interference type optical fiber sensor0nComparing;
if the phase demodulation result Z0nLess than phase demodulation result Z0Then the phase demodulation result Z0Multiplying the result by-1 to obtain a final phase demodulation result Z and outputting the final phase demodulation result Z;
if the phase demodulation result Z0nGreater than phase demodulation result Z0Then directly demodulating the phase demodulation result Z0As the final phase demodulation result Z output.
Wherein, the phase difference of two arms of the interference type optical fiber sensor is increased to obtain a phase demodulation result Z0nAnd obtaining a phase demodulation result Z0The method is the same(i.e., repeating S100-S110) and will not be described in detail herein.
According to an embodiment of the invention, the predetermined constant is
Figure BDA0002736105440000071
The phase demodulation system and method of the present invention are described below with reference to a michelson interferometer as an example.
Wherein, the light intensity expression of the output signals of the three ports of the 3 multiplied by 3 coupler is as follows:
Figure BDA0002736105440000072
wherein the content of the first and second substances,
Figure BDA0002736105440000073
is the phase to be measured (phase demodulation result).
The output signals of the two ports are arbitrarily selected, here as I2And I3The analysis was performed as an example. To I2And I3The derivation operations are performed separately to obtain:
Figure BDA0002736105440000081
Figure BDA0002736105440000082
I′2and l'3Adding up, the following can be obtained:
I′2+I′3＝Bφ′sinφ (4)
I′2minus l'3The following can be obtained:
Figure BDA0002736105440000083
equation (4) is divided by equation (5) to yield:
Figure BDA0002736105440000084
thus, the signal to be measured can be found as:
Figure BDA0002736105440000085
two ports are selected for arrangement, and 6 conditions are total. In practical situations, due to the unknown of the ports, if two ports are arbitrarily selected, demodulation is performed according to the above procedure, and two cases exist as the obtained result:
1) the actual demodulation result is completely consistent with the demodulation result;
2) the actual demodulation result and the demodulation result are opposite numbers.
Therefore, the demodulation result can be corrected. The specific correction method comprises the following steps: increasing the phase difference of two arms of the interference type optical fiber sensor, demodulating according to the process to obtain a new signal to be measured
Figure BDA0002736105440000086
If new signal under test
Figure BDA0002736105440000087
Less than the signal to be measured
Figure BDA0002736105440000088
Then to the signal under test
Figure BDA0002736105440000089
Multiplying by-1 and outputting as a final result; if new signal under test
Figure BDA00027361054400000810
Greater than the signal to be measured
Figure BDA00027361054400000811
Then to the signal to be measured
Figure BDA00027361054400000812
Directly outputting the signal to be measured without processing
Figure BDA00027361054400000813
As a final result.
Features that are described and/or illustrated above with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
The above systems and methods of the present invention may be implemented by hardware, or by a combination of hardware and software. The present invention relates to a computer-readable program which, when executed by a logic section, enables the logic section to realize the above-described apparatus or constituent section, or to realize the above-described various methods or steps. The present invention also relates to a storage medium such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like, for storing the above program.
The many features and advantages of these embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of these embodiments which fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.
The invention has not been described in detail and is in part known to those of skill in the art.

Claims (7)

1. A phase demodulation system for an interferometric fiber optic sensor, comprising:
a differential module for performing differential operation on any two paths of outputs of the 3 × 3 coupler of the interference type optical fiber sensor to obtain a first differential result D1And a second differentiation result D2；
An adder connected to the differentiating module for differentiating the first differentiation result D1And a second differentiation result D2Performing addition operation to obtain an addition result P;
a subtractor connected to the differentiating module for differentiating the first differentiation result D1Subtracting the second differentiation result D2Obtaining a subtraction result S;
the divider is connected with the adder and the subtracter and is used for dividing the addition result P by the subtraction result S to obtain a division result C;
the multiplier is connected with the divider and used for multiplying the division result C and a preset constant to obtain a multiplication result M;
an arc tangent arithmetic unit connected with the multiplier and used for carrying out arc tangent operation on the multiplication result M to obtain a phase demodulation result Z0。
2. The system of claim 1, further comprising a calibration module coupled to the arctangent operator for calibrating the phase demodulation result Z0And a phase demodulation result Z obtained by increasing the phase difference of the two arms of the interference type optical fiber sensor0nMaking a comparison if the phase demodulation result Z0nLess than phase demodulation result Z0Then the phase demodulation result Z0Multiplying by-1 to obtain final phase demodulation result Z, and if the phase demodulation result Z is0nGreater than phase demodulation result Z0Then directly demodulating the phase demodulation result Z0As the final phase demodulation result Z output.
3. The system of claim 2, wherein the differentiating module comprises a first differentiator and a second differentiator, the first differentiator is used for outputting any two paths of the 3 x 3 couplerOne path of output in the first path of output is subjected to differential operation to obtain a first differential result D1The second differentiator is used for carrying out differential operation on the other output of the two arbitrary paths of outputs of the 3 multiplied by 3 coupler to obtain a second differential result D2。
4. The system of any of claims 1-3, wherein the predetermined constant is
Figure FDA0003498285680000021
5. A phase demodulation method for an interferometric fiber optic sensor, comprising:
respectively carrying out differential operation on any two paths of outputs of the 3 multiplied by 3 coupler of the interference type optical fiber sensor to obtain a first differential result D1And a second differentiation result D2；
To the first differentiation result D1And a second differentiation result D2Performing addition operation to obtain an addition result P;
the first differentiation result D1Subtracting the second differentiation result D2Obtaining a subtraction result S;
dividing the addition result P by the subtraction result S to obtain a division result C;
multiplying the division result C by a preset constant to obtain a multiplication result M;
performing arc tangent operation on the multiplication result M to obtain a phase demodulation result Z0。
6. The method of claim 5, further comprising:
demodulating the phase of the result Z0And a phase demodulation result Z obtained by increasing the phase difference of the two arms of the interference type optical fiber sensor0nComparing;
if the phase demodulation result Z0nLess than phase demodulation result Z0Then the phase demodulation result Z0Multiplied by-1 as the final phaseOutputting a demodulation result Z;
if the phase demodulation result Z0nGreater than phase demodulation result Z0Then directly demodulating the phase demodulation result Z0As the final phase demodulation result Z output.
7. The method of claim 5 or 6, wherein the predetermined constant is
Figure FDA0003498285680000031
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