CN210155032U - High-precision optical fiber humidity measuring device based on quantum weak value amplification - Google Patents
High-precision optical fiber humidity measuring device based on quantum weak value amplification Download PDFInfo
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- CN210155032U CN210155032U CN201920948920.4U CN201920948920U CN210155032U CN 210155032 U CN210155032 U CN 210155032U CN 201920948920 U CN201920948920 U CN 201920948920U CN 210155032 U CN210155032 U CN 210155032U
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Abstract
The utility model discloses a high accuracy optic fibre humidity measuring device based on quantum weak value is enlargied, include: the device comprises a broadband laser, a first collimator, a 45-degree polarizing plate, a first birefringent crystal, a drying air chamber, a measured air chamber, a half-wave plate, a second birefringent crystal, a phase compensation plate, a-45-degree polarization analyzing plate, a second collimator and a spectrum demodulator; the output of the broadband laser is connected with the input end of the first collimator; the output end of the first collimator firstly passes through a 45-degree polarizing plate to form 45-degree linearly polarized light, the 45-degree linearly polarized light is divided into two paths through the first birefringent crystal, one path of the two paths passes through a section of measured air chamber, the other path of the two paths passes through a section of drying air chamber, then the two paths of light paths respectively and directly pass through a half-wave plate, then enter the second birefringent crystal, finally pass through a phase compensation plate, pass through a-45-degree polarization detection plate, are coupled to a second collimator, and enter a spectrum demodulator through the second collimator.
Description
Technical Field
The utility model belongs to the technical field of optical fiber sensing, especially, relate to an optic fibre humidity measuring device based on quantum weak value is enlargied.
Background
The statements herein merely provide background related to the present disclosure and may not necessarily constitute prior art.
At present, commercial temperature and humidity sensing probe products mainly comprise general products such as a dry-wet-bulb temperature and humidity probe, a humidity-sensitive resistance type temperature and humidity probe, a humidity-sensitive capacitance type temperature and humidity probe and the like which are composed of mercury thermometers, and an optical fiber temperature and humidity probe is not adopted.
The dry-wet bulb temperature and humidity probe technology is mature, a dry-wet thermometer is mainly adopted to form a dry-wet meter, and a table look-up method is used for measuring the relative humidity value in the air. However, the hygrothermograph can only be used independently by each probe, and can only finish data reading and recording manually, so that the hygrothermograph is poor in convenience and high in labor cost in use, can not realize functions of networking of multiple sensing probes, remote transmission of temperature and humidity data and the like, and does not have the condition of intelligent use.
The resistance-type and capacitance-type temperature and humidity sensing probes sense temperature and humidity data through temperature-sensitive and humidity-sensitive electronic components, power is required to be supplied in the use process, data transmission is also assisted by a power supply and related cables, the passive sensing end cannot be achieved, the electronic components are sensitive to the use environment, and the electronic components are easy to age after being used for a long time, so that the precision is reduced.
In addition, the optical fiber sensor is used as a temperature and humidity sensing element, and a temperature and relative humidity sensing probe is formed by a dry method and a wet method, so that the sensing element can be made into a full optical fiber, but the probe is maintained at a later stage, and a wet environment is manufactured by adding water. It has been reported that the fiber grating or multimode fiber is coated with a moisture sensitive material and can also measure moisture. But the process has strict requirements on the material and thickness of the coating layer. The production of the humidity-sensitive sensor can cause low product qualification rate and higher cost. The humidity sensor adopting the multimode optical fiber mode cannot measure humidity at a long distance.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned problem, overcome and have costly detector, long distance problem among the current humidity sensitive measurement technique, this application has provided a high accuracy optic fibre humidity measuring device based on quantum weak value is enlargied, and the device possesses natural advantages such as being fit for sensing data remote transmission, probe long service life, stable performance, anti-electromagnetic interference strong with low costs, measurement accuracy height and quick response.
The utility model discloses a first purpose provides an optic fibre humidity measurement device based on quantum weak value is enlargied.
In order to achieve the above object, the utility model adopts the following technical scheme:
an optical fiber humidity measuring device based on quantum weak value amplification, comprising:
the device comprises a broadband laser, a first collimator, a 45-degree polarizing plate, a first birefringent crystal, a drying air chamber, a measured air chamber, a half-wave plate, a second birefringent crystal, a phase compensation plate, a-45-degree polarization analyzing plate, a second collimator and a spectrum demodulator;
the output end of the first collimator firstly passes through a 45-degree polarizing plate to form 45-degree linearly polarized light, the 45-degree linearly polarized light is divided into two paths through a first birefringent crystal, one path of the two paths passes through a section of measured air chamber, the other path of the two paths passes through a section of drying air chamber, then the two paths of light paths respectively and directly pass through a half-wave plate, then enter a second birefringent crystal, finally pass through a phase compensator, pass through a-45-degree polarization analyzer, are coupled to a second collimator, and enter a spectrum demodulator through the second collimator.
As a further technical scheme, the broadband laser outputs broadband laser, passes through the first collimator, passes through a 45 ° polarizer, and then is split into two paths of light by the first birefringent crystal, one path of light is o light, the other path of light is e light, the two paths of light are orthogonal to each other, the one path of light measures the refractive index of the measured air chamber, that is, the light passes through the measured air chamber and then is input to the half-wave plate, so that the o light is converted into the e light, and then enters the second birefringent crystal.
And the other path of e light is transmitted to a drying air chamber with equal temperature and pressure and then input to a half-wave plate, so that the e light is converted into o light. And the two paths of orthogonal light are combined into a beam of 45-degree linearly polarized light in the second birefringent crystal, the beam is compensated by a phase compensator, and finally passes through a-45-degree analyzer, and a tiny angle of the polarization angle of the-45-degree analyzer and the output 45-degree linearly polarized light is adjusted, wherein the tiny angle is generally about 0.01-0.03 rad, so that the power value of the output light of the light path is smaller, and weak coupling is formed. And then the light is coupled into a second collimator and input into a spectrum demodulator through an optical fiber for phase demodulation.
The utility model discloses in, adopt the light path of two air chamber structures. The air chamber to be measured is communicated with the outside atmosphere, in addition, the drying air chamber is also communicated with the outside, but the air chamber to be measured is not communicated with the drying air chamber and is isolated from the drying air chamber; the air pressure and temperature of the air chamber to be measured and the air pressure and temperature of the drying air chamber are the same, but the air refractive index of the air chamber to be measured is changed due to the influence of humidity, so that the air refractive indexes of the air chamber to be measured and the air refractive index of the air chamber to be measured are different, and the light phase change is caused, and the light phase change is very small, wherein the refractive index can be changed to 10 by 1% RH generally-6RIU, but can be measured by such quantum weak measurement systems.
In the utility model, the broadband light is adopted to measure the air refractive index, so that the humidity of the air can be measured quickly and in real time; the volume of the humidity detector can be made small; meanwhile, the humidity of the gas can be measured in a long distance; the humidity detector is a passive device, can measure humidity for a long time, and simultaneously adopts a broadband light source as a light source, so that the material cost of the system is low.
The measuring method of the high-precision optical fiber humidity measuring device based on the quantum weak value amplification comprises the following steps:
(1) obtaining a broadband spectrogram of a broadband laser, wherein the broadband spectrum is generally a Gaussian spectrum.
(2) After the light passes through the 45-degree polarizing plate, the light forms linearly polarized light, and the polarization direction of the light forms a 45-degree included angle with the horizontal direction.
(3) When linearly polarized light is incident on the birefringent crystal, the birefringent crystal has a cut angle of 45 degrees, so that the linearly polarized light is divided into o light and e light. The o light and the e light are orthogonal light, and are vertical polarized light and horizontal polarized light.
(4) The o light and the e light respectively pass through the two air chambers, the measured air chamber is a position for measuring humidity, and the drying air chamber is a reference air chamber.
(5) After the two light paths pass through the half-wave plate, the o light is converted into the e light, and the e light is converted into the o light. The two paths of light are combined into a beam through another birefringent crystal. And linearly polarized light is formed after the light beams are combined.
(6) And adjusting the phase compensation angle of the humidity detector to minimize the power value of the light after the light passes through the humidity detector, and simultaneously, enabling the broadband spectrum to be consistent with the input Gaussian spectrum.
(7) And finally, adjusting the angle of a-45-degree polarization analyzer to enable the angle to be about 0.01-0.03 rad, and adjusting a phase compensation angle to enable the output broadband spectrum to display the saddle shape.
The utility model discloses in at humidity detector during operation, the refracting index of being surveyed the air chamber changes, and the phase place of two way light just also changes.
As a further technical scheme, from the step (2), when the light passes through the 45-degree polarizer, the quantum initial state | psi > of the linearly polarized light is
|ψ>＝sinα|H>+cosα|V>
Wherein | H > is the horizontal polarization state, | V > is the vertical polarization state, α forms an angle with the horizontal polarization.
As a further technical solution, after the steps (3) (4) (5) (6) (7), the quantum post-selection state | Φ > of the linearly polarized light is:
wherein β is the angle between the analyzer plate and the horizontal direction,
for the phase variation, x is the initial phase of light, the real parts α and β are the angles between linearly polarized light and the horizontal direction, respectively, and i is the imaginary part of the phase angle of the linearly polarized light.
According to the quantum weak value amplification principle, the weak value amplification factor of the system is as follows:
a is an operator, and A ═ V > < V |. Since the system needs to solve the phase, we only need the imaginary part of the weak value amplification factor, so the imaginary value is:
wherein the content of the first and second substances,
the centroid position offset for the broadband spectral wavelength is as follows:
wherein, Delta lambda is the spectral width, lambda0Is the center wavelength of the spectrum. By measuring the mass center displacement of the spectrum, the high-precision real-time measurement of the humidity of the optical fiber is measured.
The utility model has the advantages that:
(1) the utility model discloses a high accuracy optic fibre humidity measuring device based on quantum is weak to be worth enlargies can adjust phase place measurement resolution through being surveyed air chamber length.
(2) The utility model discloses a high accuracy optic fibre humidity measuring device based on quantum is enlarged weak value adopts two air chamber structures, can realize very long distance optic fibre humidity and measure to improve optic fibre humidity measurement accuracy.
(3) The utility model discloses a high accuracy optic fibre humidity measuring device based on quantum is enlargied weak value adopts the broadband laser instrument to modulate, but the CCD spectral sensor of low cost to can realize the low-cost humidity measurement of on-line measuring optic fibre.
(4) The utility model discloses a high accuracy optic fibre humidity measuring device based on quantum is enlarged slightly, adopts the quantum to enlarge the technique slightly, through measuring under two same temperatures in the double air chamber and the same atmospheric pressure, the phase variation volume that the air refracting index of different humidity introduced calculates the spectrum barycenter displacement volume, can realize that long distance optic fibre humidity's high accuracy is measured when really.
Drawings
Fig. 1 is a structural diagram of a high-precision optical fiber humidity measuring device based on quantum weak value amplification of the present invention;
fig. 2 is an optical fiber output spectrum diagram of a high-precision optical fiber humidity measuring device based on quantum weak value amplification of the present invention;
fig. 3 is a graph showing the relationship between the mass center displacement and the phase variation of the high-precision optical fiber humidity measuring device based on quantum weak value amplification of the present invention;
in the figure: the device comprises a broadband laser 1, a first collimator 2, a polarizing plate 345 degrees, a first birefringent crystal 4, a drying air chamber 5, a measured air chamber 6, a half-wave plate 7, a second birefringent crystal 8, a phase compensation plate 9, an analyzer plate 10-45 degrees, a second collimator 11 and a spectrum demodulator 12.
The specific implementation mode is as follows:
it should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be further explained with reference to the accompanying drawings and examples.
The drying air chamber is different from the air chamber to be tested. The two air chambers are communicated with the outside, and when the drying air chamber is communicated with the outside atmosphere, the waterproof molecular sieve is added outside the air hole, so that the air chamber can only enter air and can not pass water molecules.
Example 1:
the embodiment provides an optical fiber humidity measuring device based on quantum weak value amplification, which comprises:
the device comprises a broadband laser 1, a first collimator 2, a 45-degree polarizing plate 3, a first birefringent crystal 4, a drying air chamber 5, a measured air chamber 6, a half-wave plate 7, a second birefringent crystal 8, a phase compensation plate 9, a-45-degree polarization analyzing plate 10, a second collimator 11 and a spectrum demodulator 12;
the whole device is divided into a light source part, a probe part and a data processing part, wherein the light source part is a broadband laser, the data processing part is a spectrum demodulator, the spectrum can be divided, and the rest parts subjected to centroid calculation processing are the probe part and comprise a first collimator 2, a 45-degree polarizer 3, a first birefringent crystal 4, a drying air chamber 5, a measured air chamber 6, a half-wave plate 7, a second birefringent crystal 8, a phase compensation plate 9, a-45-degree analyzer plate 10 and a second collimator 11, and the light source part and the spectrum demodulator part can be assembled together.
The light source part, the spectrum demodulator and the probe part are connected by adopting optical fibers.
The probe part is a device mainly used for measuring humidity. The preparation method comprises the following steps:
1) firstly, the two collimators are coupled and adjusted.
2) And adding two birefringent crystals, and adding 1/4 wave plates between the two crystals. A gap is left between the two crystals, and the gap is about 1-3 mm. The double-light-path structure is prepared by two light paths of the double-refraction crystal emergent by adopting a glass sheet and glue, and the double-light-path air chamber can be ventilated through the small holes. The small hole of the light path of one air chamber is sealed by a water molecular sieve, so that the air chamber can pass gas molecules but cannot pass water molecules. The other light path gas chamber small hole is not sealed.
3) Fixing a 45-degree polarizer between the optical fiber collimator and the first birefringent crystal by using glue, and separating two paths of light with straight optical power and the like after the light passes through the birefringent crystal; and fixing the 45-degree polarization analyzer between the output collimator and the second birefringent crystal by using glue, adjusting the angle of the polarization analyzer to minimize the optical power, and rotating the 45-degree polarization analyzer by using a spectrometer to enable the spectrum to be saddle-shaped.
4) After the glue is solidified, a shell is added, and the shell is dustproof and breathable for powder metallurgy.
The output of the broadband laser 1 is connected with the optical fiber input end of the first collimator 2;
the output end of the first collimator 2 firstly passes through a 45-degree polarizing plate 3 to form 45-degree linearly polarized light, the 45-degree linearly polarized light is divided into two paths through a first birefringent crystal 4 (usually a 45-degree cut YVO4 crystal), one path of the 45-degree linearly polarized light directly passes through a half-wave plate 7 after passing through a section of measured air chamber 6, then enters a second birefringent crystal 8, finally passes through a phase compensation plate 9, passes through a-45-degree polarization analyzer 10, is coupled to a second collimator 11, and then enters a spectrum demodulator 12 through the second collimator 11.
The output end of the other light path of the first birefringent crystal 4 directly enters a half-wave plate 7 after passing through the drying air chamber 5, then enters a second birefringent crystal 8, finally passes through a phase compensation plate 9, passes through a-45-degree polarization analyzer 10, is coupled to a second collimator 11, and enters a spectrum demodulator 12 through the second collimator 11.
Further, the broadband laser 1 outputs broadband laser, after passing through the first collimator (2) and passing through the 45 ° polarizer 3, two paths of light are split out through the first birefringent crystal 4, one path of light is o light, the other path of light is e light, the two paths of light are orthogonal to each other, the one path of light measures the refractive index of the measured air chamber, namely, the light passes through the measured air chamber 6 and then is input into the half-wave plate 7, so that the o light is converted into the e light, and then the e light enters the second birefringent crystal 8. And the other path of e light is transmitted to a drying gas chamber 6 with equal temperature and pressure and then input to a half-wave plate 7, so that the e light is converted into o light. And the light enters a second birefringent crystal 8, two paths of orthogonal light are combined into a beam of 45-degree linearly polarized light in the second birefringent crystal, the beam is compensated by a phase compensation sheet 9, and finally passes through a-45-degree analyzer 10, and the micro angle of the polarization angle of the-45-degree linearly polarized light and the polarization angle of the 45-degree linearly polarized light is adjusted and is generally about 0.01-0.03 rad, so that the power value of the output light of the light path is relatively small, and weak coupling is formed. The light is coupled into a second collimator 11 and input to a spectrum demodulator 12 through an optical fiber for phase demodulation.
The drying air chamber 5 is different from the tested air chamber 6. The two air chambers are communicated with the outside, and when the drying air chamber 5 is communicated with the outside atmosphere, the waterproof molecular sieve is added outside the air hole, so that the air chamber can only enter air and can not pass water molecules, and the tested air chamber 6 is not provided with a water-discharging molecular sieve.
The fixing and mounting modes of the broadband laser 1, the first collimator 2, the 45 ° polarizer 3, the first birefringent crystal 4, the half-wave plate 7, the second birefringent crystal 8, the phase compensator 9, the-45 ° analyzer 10, the second collimator 11 and the spectrum demodulator 12 are set as required, for example, the device can be clamped in a shell, a tested air chamber and a drying air chamber are arranged in the middle of the shell, as shown in fig. 1, the upper part is the drying air chamber, the lower part is the tested air chamber, and the drying air chamber and the tested air chamber are not communicated; the broadband laser 1, the first collimator 2, the 45-degree polarizer 3 and the first birefringent crystal 4 are arranged on the left side of the drying chamber and the measured air chamber, and the half-wave plate 7, the second birefringent crystal 8, the phase compensation plate 9, the-45-degree analyzer 10, the second collimator 11 and the spectrum demodulator 12 are arranged on the right side of the drying chamber and the measured air chamber.
In the utility model, two air chamber structures are adoptedThe optical path of (1). The air chamber to be measured is communicated with the outside atmosphere, and in addition, the drying air chamber is also communicated with the outside. The air pressure and temperature of the air chamber to be measured and the air pressure and temperature of the drying air chamber are the same, but the air refractive index of the air chamber to be measured is changed due to the influence of humidity, so that the air refractive indexes of the air chamber to be measured and the air refractive index of the air chamber to be measured are different, and the light phase change is caused, and the light phase change is very small, wherein the refractive index can be changed to 10 by 1% RH generally-6RIU, but can be measured by such quantum weak measurement systems.
In the utility model, the broadband light is adopted to measure the air refractive index, so that the humidity of the air can be measured quickly and in real time; the volume of the humidity detector can be made small; meanwhile, the humidity of the gas can be measured in a long distance; the humidity detector is a passive device, can measure humidity for a long time, and simultaneously adopts a broadband light source as a light source, so that the material cost of the system is low.
Example 2
The present embodiment provides a measurement method based on the apparatus disclosed in embodiment 1, the method including the steps of:
(1) obtaining a broadband spectrogram of a broadband laser, wherein the broadband spectrum is generally a Gaussian spectrum.
(2) After the light passes through the 45-degree polarizing plate, the light forms linearly polarized light, and the polarization direction of the light forms a 45-degree included angle with the horizontal direction.
(3) When linearly polarized light is incident on the birefringent crystal, the birefringent crystal has a cut angle of 45 degrees, so that the linearly polarized light is divided into o light and e light. The o light and the e light are orthogonal light, and are vertical polarized light and horizontal polarized light.
(4) The o light and the e light respectively pass through the two air chambers, the measured air chamber is a position for measuring humidity, and the drying air chamber is a reference air chamber.
(5) After the two light paths pass through the half-wave plate, the o light is converted into the e light, and the e light is converted into the o light. The two paths of light are combined into a beam through another birefringent crystal. And linearly polarized light is formed after the light beams are combined.
(6) And adjusting the phase compensation angle of the humidity detector to minimize the power value of the light after the light passes through the humidity detector, and simultaneously, enabling the broadband spectrum to be consistent with the input Gaussian spectrum.
(7) And finally, adjusting the angle of a-45-degree polarization analyzer to enable the angle to be about 0.01-0.03 rad, and adjusting a phase compensation angle to enable the output broadband spectrum to display the saddle shape.
The utility model discloses at humidity transducer during operation, the gas of different humidity, the refracting index of air chamber measured changes, and then the phase place of two way light just also changes, and then the offset through the barycenter position of broadband spectral wavelength realizes that the high accuracy of long distance optic fibre humidity is measured when really.
From said step (2), when the light passes through the 45 ° polarizer, the initial state of the light is
|ψ>＝sinα|H>+cosα|V>
Wherein | H > is the horizontal polarization state, | V > is the vertical polarization state, α forms an angle with the horizontal polarization.
Further, after the steps (3), (4), (5), (6) and (7), the post-selection state of the light is
Wherein β is the angle between the analyzer plate and the horizontal direction,
for the phase change amount, x is the initial phase of the light.
According to the quantum weak value amplification principle, the weak value amplification factor of the system is
Since the system needs to solve the phase, we only need the imaginary part of the weak value amplification factor, so the imaginary value is:
wherein the content of the first and second substances,
the centroid position offset for the broadband spectral wavelength is as follows:
in the quantum weak point amplification system provided in the present embodiment, it is possible to set α to 45 °, β to-0.35 °, and x is adjusted by the phase compensator so that x is adjusted
Phase position
The variation range is 0-1 degree, namely 0-1.75 multiplied by 10-2rad。
Then
Shift of centroid of broadband spectrum
By debugging the phase compensator, the phase angle is reduced by 0-1 degrees in a simulation mode, the attached figure 2 can be obtained through a spectrogram, and a relation graph of the mass center displacement and the phase angle can be obtained through calculation, such as the attached figure 3.
The refractive index of the air in the measured air chamber can be expressed as follows:
wherein n is1Is the refractive index of the atmosphere; p is atmospheric pressure; t is the temperature; RH is humidity.
The refractive index of the air in the dry air cell can be expressed as follows:
the atmospheric refractive index change is about 10 when the humidity changes by 1% RH at room temperature of 20 ℃ under a standard atmospheric pressure-6RIU。
Due to the difference of the humidity of the two air chambers, the difference of the refractive indexes is caused, and the time delay of the light path is generated
Wherein, l is the optical path of the air chamber, and C is the speed of light in air 3 multiplied by 108m/s, delta n is refractive index variation delta n of two air chambers due to different humidity is 10-6RIU RH%, where n is n because of the small refractive index variation1≈n 21, the optical path time delay Δ ti is
The phase change of the light resulting from the delay of the light path time
When the humidity is in the range of 0% -100%, the phase angle
In the range of 0-1 deg., i.e., 0-1.75X 10-2And (7) rad. When the center wavelength of the spectrum of the broadband laser is lambda01.55um, 1mm can be set.
So that the center position of the broadband spectrum is offset by
By measuring the shift of the centroid of the spectrum, we can derive the value of the humidity in the atmosphere. When the spectral width is 40nm, the spectrometer resolution is 0.01nm, and the humidity resolution is 0.25%.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A high-precision optical fiber humidity measuring device based on quantum weak value amplification is characterized in that: the device includes:
the device comprises a broadband laser, a first collimator, a 45-degree polarizing plate, a first birefringent crystal, a drying air chamber, a measured air chamber, a half-wave plate, a second birefringent crystal, a phase compensation plate, a-45-degree polarization analyzing plate, a second collimator and a spectrum demodulator;
the output of the broadband laser is connected with the input end of the first collimator;
the output end of the first collimator firstly passes through a 45-degree polarizing plate to form 45-degree linearly polarized light, the 45-degree linearly polarized light is divided into two paths through a first birefringent crystal, one path of the two paths passes through a section of measured air chamber, the other path of the two paths passes through a section of drying air chamber, then the two paths of light paths respectively and directly pass through a half-wave plate, then enter a second birefringent crystal, finally pass through a phase compensator, pass through a-45-degree polarization analyzer, are coupled to a second collimator, and enter a spectrum demodulator through the second collimator.
2. The high-precision optical fiber humidity measuring device based on quantum weak value amplification as claimed in claim 1, wherein the phase measurement resolution is adjusted by the length of the measured gas chamber.
3. The high-precision optical fiber humidity measuring device based on quantum weak value amplification as claimed in claim 1, wherein the first birefringent crystal splits two lights, one light is o light, the other light is e light, and the two lights are orthogonal to each other.
4. The high-precision optical fiber humidity measuring device based on quantum weak value amplification as claimed in claim 3, wherein one path of o light is used for measuring the refractive index of the measured air chamber, i.e. the light passes through the measured air chamber and then is input into the half-wave plate, so that the o light is converted into e light and then enters the second birefringent crystal; and the other path of e light is transmitted to a drying air chamber with equal temperature and pressure and then input to a half-wave plate, so that the e light is converted into o light.
5. The high-precision optical fiber humidity measuring device based on quantum weak value amplification as claimed in claim 3, wherein two paths of orthogonal light are combined into a beam of 45 ° linearly polarized light in the second birefringent crystal, then compensated by the phase compensator, and finally passed through a-45 ° analyzer, and the output light power value of the optical path is smaller by adjusting the tiny angle of the polarization angle of the 45 ° linearly polarized light output by the-45 ° analyzer and the second birefringent crystal, thereby forming weak coupling.
6. The high-precision optical fiber humidity measuring device based on quantum weak value amplification as claimed in claim 5, wherein the minute angle is about 0.01 to 0.03 rad.
7. The high-precision optical fiber humidity measuring device based on quantum weak value amplification as claimed in claim 1, wherein the drying air chamber and the measured air chamber are both communicated with the outside, the drying air chamber and the measured air chamber are isolated from each other, and a waterproof molecular sieve is arranged at the position where the drying air chamber is communicated with the outside atmosphere.
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| CN110146466A (en) * | 2019-06-21 | 2019-08-20 | 珠海任驰光电科技有限公司 | High-precision optical fiber humidity measuring instrument and method based on the weak value amplification of quantum |
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| CN110146466A (en) * | 2019-06-21 | 2019-08-20 | 珠海任驰光电科技有限公司 | High-precision optical fiber humidity measuring instrument and method based on the weak value amplification of quantum |
| CN110146466B (en) * | 2019-06-21 | 2024-03-12 | 珠海任驰光电科技有限公司 | High-precision optical fiber humidity measurement device and method based on quantum weak value amplification |
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