CN114324267A - Method and device for compensating Coriolis effect in fluorescence collection - Google Patents

Abstract

The invention discloses a method and a device for compensating Coriolis force effect in fluorescence collection, belonging to the field of cold atom interference physics. The present invention includes a lens set unit for reducing the effects of stray light and a multi-pixel silicon PIN photodiode for locating atomic spatial locations. The invention detects the fluorescent signal emitted by the stimulated radiation of the atomic group in the vacuum cavity, the enhanced fluorescence signal is collected by a multi-pixel array detector, the radius of the atomic group is obtained by approximate Gaussian curve fitting, and then the acceleration of gravity is calculated by the Coriolis force formula The offset value, combined with the experimental test value, completes the compensation of the gravitational acceleration value, overcomes the Coriolis force effect, further improves the measurement accuracy and uniformity, and greatly improves the physical parameter measurement, signal-to-noise ratio and signal-to-noise ratio in the fluorescence detection process in the field of cold atom physics. Measurement accuracy. The invention has the advantages of anti-background light, high signal-to-noise ratio, compact device structure, good stability, low manufacturing cost, convenient use and high adjustment sensitivity.

Description

A method and device for compensating for Coriolis effect in fluorescence collection

technical field

The invention relates to a device for collecting atomic final state fluorescence, belonging to the field of cold atom interference physics.

Background technique

In recent years, there have been more and more studies on the application of cold atoms, mainly due to the long wavelength of cold atoms, strong coherence of cold atomic groups, and fine manipulation, and when the temperature of cold atoms is lower than the condensation critical temperature, cold atomic groups form Bose- Einstein condensates will exhibit more properties. Therefore, the research of cold atom physics is of great significance to the fields of quantum computing, quantum information storage, quantum precision measurement, and atomic interferometry.

In the cold atom experiment, the manipulation and detection of cold atoms is very important. Take the cold atom interferometric gravimeter as an example. During the fall of the atomic cluster, the rotation of the earth will generate an east-west velocity component, and then the Coriolis force will cause interference. The extra phase shift of the system can cause a systematic error of the order of 10 μGal, which seriously affects the measurement accuracy and uncertainty, and needs to be corrected and compensated in the actual experiment. The reported method of compensating for this system error is to turn the measuring instrument 180 degrees back and forth, and measure the gravitational acceleration twice. The initial velocity v horizontal component of the atom is in opposite directions, and the average value can cancel this out, but this method actually works. quite complicated. Therefore, it is considered that the Coriolis force can also be compensated when the fluorescence detection is uniformly collected and the atomic group velocity is symmetrical with the atomic group center. The existing fluorescent detection technical solutions are mainly divided into two categories, ordinary single-pixel photodiode detectors and CCD array detectors. The former is mainly realized by high-gain multi-stage amplifying symmetrical detection, but the device is complicated and the experimental effect is poor; The above traditional fluorescence detection technology greatly limits the compensation accuracy of the Coriolis force, and cannot meet the application requirements in the field of cold atom physics, especially in the direction of quantum precision measurement.

SUMMARY OF THE INVENTION

In order to solve the shortcomings of uneven detection of the existing fluorescence detection devices, improve the accuracy of fluorescence detection, and meet the needs of its use in the field of cold atom physics, the main purpose of the present invention is to provide a method for compensating the Coriolis force effect in fluorescence collection. And the device can improve the detection accuracy and uniformity of fluorescence detection, and greatly improve the physical parameter measurement, signal-to-noise ratio and measurement accuracy in the process of fluorescence detection in the field of cold atom physics. The invention has the advantages of stable structure, compactness, easy adjustment and the like.

The purpose of this invention is to realize through following technical scheme:

A method for compensating the Coriolis force effect in fluorescence collection disclosed in the present invention comprises the following steps:

Step 1: The multi-pixel array detector converts the collected fluorescence light intensity signal of the atomic group into a voltage signal.

The fluorescence intensity of the atomic group is I ₀ , the unit is nW, the conversion efficiency of the detector is γ, the unit is W/A, and the gain coefficient of the detector is ε, then the voltage value U=γ·ε·I ₀ .

Step 2: Calculate the atomic group radius x _i .

At time Ti, each pixel of the multi-pixel array detector provides a voltage value, and a formula is fitted to obtain the curve _Uxi , and further obtain the radius of the atomic group _xi .

Step 3: Calculate the horizontal velocity v ₀ of the atomic group.

The center position of the atomic group is x ₀ , and the initial horizontal velocity is v ₀ . The relationship between the two layers of detection is as follows:

x ₀ +v ₀ t _i = _xi

Step 4: Calculate the gravitational acceleration deviation value Δg.

Since the direction of the effective wave vector k _eff of the Raman light is rotated in the inertial coordinate system due to the influence of the earth's rotation when the gravitational acceleration is measured using an atomic interferometer on the earth's surface, the Coriolis effect is introduced, which will eventually affect The gravity value is measured, resulting in a deviation of Δg:

where Ω _E is the angular velocity of the earth's rotation, v is the velocity of the atomic group, and k _eff is the effective wave vector of Raman light. Generally, along the vertical direction, the gravity measurement deviation is mainly caused by the horizontal velocity of the atomic group.

Step 5: Compensation of the Coriolis force effect of the gravitational acceleration value is completed in combination with the experimental test values, that is, to effectively overcome the Coriolis force effect, improve the detection accuracy and uniformity of fluorescence detection, and greatly improve the fluorescence detection process in the field of cold atom physics. Physical parameters measure signal-to-noise ratio and measurement accuracy.

The systematic error introduced by Coriolis force is calculated as Δg, and the compensated gravitational acceleration value is g:

g=g ₀ +Δg

where g ₀ is the gravitational acceleration value obtained from the interference fringes measured by the atomic gravimeter experiment.

In step 1, when the multi-pixel array detector collects the fluorescent light intensity signal, it is necessary to ensure that the multi-pixel array detector is located in the east-west direction of the atomic group;

The method for fitting the curve _Uxi described in step 2 is:

Step 2.1: Count the number of atoms.

The cold atomic group is equivalent to a point, and the atomic group is taken as the center of the circle, the solid angle opened by the detection surface of the detector is:

Among them, l is the distance between the center of the detector and the center of the atomic group, and r is the radius of the detection area of the detector. In order to eliminate the influence of background light, it must be detected twice, once with atomic groups and once without atomic groups, and subtract the values of the two detections to obtain the net fluorescence intensity. And to calibrate the photodiode, irradiate the photodiode with a beam of known intensity of laser light to measure the quantum effect of the photodiode (a = number of electrons/number of photons), the number of electrons emitted by the unit solid angle atomic group per unit time is NR _sc a , the current per unit solid angle is NR _sc ae, where e is the electron charge.

The output voltage of the amplifier and the input current are: ΔU=β·ΔI, where the unit of β is v/mA, then the voltage indication of the detector is:

Then the number of atoms in the atomic group is:

where R _sc is the light scattering rate, and Ω is the solid angle of the measurement area.

Step 2.2: Calculate the atomic group density.

After the number of atoms is measured, and then continue to detect according to the falling process of the atomic group, the distribution of atoms in the magneto-optical trap in three-dimensional space follows the Gaussian density score:

where σ _x , σ _y , and σ _z are the radii (radius of atomic clusters) at which the density of the atomic cloud in the x, y, and z directions drops to 1/e of the highest value. n ₀ is the maximum density, which is related to the total number of atoms in the group as follows:

Although the distribution of MOT on xoy is not completely symmetrical, for the convenience of the atomic group density, the following simplification is made: σ _x =σ _y . Only need to know the total number of atoms in the original group, the radius of the atomic group in the x direction and the radius of the atomic group in the z direction, that is, the density of the atomic group can be calculated. At the maximum voltage value, the atomic group is the brightest, and the falling speed is roughly set to remain unchanged, that is, the equivalent atomic group radius can be calculated, and then the density of the atomic group can be obtained.

Step 2.3: Establish a fitting formula;

Step 2.4: Fit the curve _Uxi by approximate Gaussian curve.

The invention also discloses a device for compensating Coriolis force effect in fluorescence collection, which is used for realizing the method for compensating Coriolis force effect in fluorescence collection. The device for compensating the Coriolis force effect in fluorescence collection includes a set of lens set units for reducing the influence of stray light and a multi-pixel silicon PIN photodiode for locating the spatial position of atoms; by detecting atomic groups in a vacuum cavity The fluorescence signal emitted by the stimulated radiation passes through the lens group, and the enhanced fluorescence signal is collected by the multi-pixel array detector. The radius of the atomic group is obtained by fitting the approximate Gaussian curve, and then the gravitational acceleration deviation is calculated by the Coriolis force formula. The experimental test value completes the gravitational acceleration worth compensation, that is, effectively overcomes the Coriolis force effect, further improves the measurement accuracy and uniformity, and greatly improves the physical parameter measurement signal-to-noise ratio and measurement accuracy in the fluorescence detection process in the field of cold atom physics.

By detecting the fluorescence emitted by the stimulated radiation of the free-falling atomic groups in the vacuum cavity, the secondary imaging lens set unit can greatly shorten the size of the single imaging, and solve the problem of the excessively large size of the fluorescence detection device. And effectively reduce the influence of background atoms and stray light, improve the effective collection rate of light intensity signals, and realize the detection of atomic final states.

Since the fluorescence signal emitted by the excited atom is weak, the photoelectric signal conversion is realized by the multi-pixel array detector of the high-gain detection device, and the gain of the detector is greatly improved by the secondary amplifier circuit, and the ability to detect weak light intensity signals is improved. This effectively improves the signal-to-noise ratio.

Preferably, the device for compensating the Coriolis force effect in fluorescence collection is mainly composed of a vacuum cavity window, atomic groups, fluorescence emission, integrated lens barrel, lens fixing snap ring, first lens, lens fixing snap ring II, and second lens fixing snap ring. Lens, lens fixing snap ring 3, third lens, lens fixing snap ring 4, fluorescence convergence, multi-pixel array detector, signal acquisition and processing display. The fluorescence emitted by the atomic group through the vacuum cavity window hits the front end of the integrated lens barrel. The lens fixing snap ring 1, the first lens, the lens fixing snap ring 2, the second lens, the lens fixing snap ring 3, the third lens fixing ring in the lens barrel The lens and the lens fixing ring are arranged coaxially in turn; the second lens adopts a doublet lens with the same performance parameters as the first lens, and the third lens uses a positive meniscus lens to reduce the loss of fluorescence collection and shorten the entire The axial length of the device unit. The fluorescence emitted by the atomic group passes through the unit structure of the secondary imaging lens set, so that the fluorescence is concentrated on the multi-pixel array detector, and the data conversion processing is completed through the signal acquisition and processing display. Through the secondary imaging lens set unit, the size of the single imaging is greatly shortened, which solves the problem that the size of the fluorescence detection device is too large, and effectively reduces the influence of background atoms and stray light, improves the effective collection rate of light intensity signals, and realizes atomic end state detection.

Beneficial effects:

1. A method and device for compensating for the Coriolis force effect in fluorescence collection disclosed in the present invention is realized based on a fluorescence collection device with precisely positioned atomic group centers. In a cold atom physics experiment, uneven fluorescence detection will seriously affect the calculation of the number of atomic groups. The device has high detection uniformity, improves the detection accuracy of the existing fluorescence detection technology, and greatly improves the physical parameter measurement, signal-to-noise ratio and measurement accuracy in the fluorescence detection process in the field of cold atom physics.

2. A method and device for compensating for the Coriolis force effect in fluorescence collection disclosed in the present invention, by detecting the fluorescence emitted by the stimulated radiation of free-falling atomic groups in a vacuum cavity, and passing through the secondary imaging lens set unit, compared with a single imaging The size is greatly shortened, which solves the problem that the size of the fluorescence detection device is too large, and effectively reduces the influence of background atoms and stray light, improves the effective collection rate of light intensity signals, and finally completes the atomic final state detection process.

3. A method and device for compensating the Coriolis force effect in fluorescence collection disclosed in the present invention, because the fluorescence signal emitted by atoms excitedly radiated is weak, the photoelectric signal conversion is realized by the high gain detection device, and the secondary amplifier circuit can be used to convert the photoelectric signal. The gain of the detector is greatly improved, the weak light intensity signal is better detected, and the signal-to-noise ratio is effectively improved.

4. A method and device for compensating the Coriolis force effect in fluorescence collection disclosed in the present invention can accurately fit the deviation of the gravity measurement system caused by the Coriolis force generated by the earth's rotation through a multi-pixel array detector. The center position of the atomic group can be obtained, so as to obtain the spatial position distribution of the atomic group, realize the effective compensation of the gravity measurement value, and directly improve the accuracy of the gravity measurement. The overall structure of the device is stable, compact, and easy to adjust, which is convenient for experimental use.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is an assembly diagram of a method and device for compensating for Coriolis force effect in fluorescence collection according to an embodiment of the present invention;

2 is a schematic diagram of the Coriolis force affecting the speed of the atomic group in a method and device for compensating for the Coriolis force effect in fluorescence collection provided by an embodiment of the present invention;

3 is a flow chart of steps of a method and apparatus for compensating for Coriolis force effect in fluorescence collection according to an embodiment of the present invention.

Among them, 1-vacuum cavity window; 2-atomic group; 3-fluorescence emission; 4-integrated lens barrel; 5-lens fixing snap ring 1; 6-first lens; 7-lens fixing snap ring 2; 8-second lens ; 9-lens fixing snap ring three; 10-third lens; 11-lens fixing snap ring four; 12-fluorescence convergence; 13-multi-pixel array detector; 14-signal acquisition and processing display.

Detailed ways

In order to better illustrate the purpose and advantages of the present invention, the content of the invention will be further described below with reference to the accompanying drawings and examples.

Example 1:

As shown in FIG. 1 , a method and device for compensating the Coriolis force effect in fluorescence collection disclosed in this embodiment includes a vacuum cavity window 1 , an atomic group 2 , a fluorescence emission 3 , an integrated lens barrel 4 , and a lens fixing snap ring 1 5 , the first lens 6, the lens fixing ring 2 7, the second lens 8, the lens fixing ring 3 9, the third lens 10, the lens fixing ring 4 11, the fluorescence convergence 12, the multi-pixel array detector 13, the signal The acquisition and processing display 14 is composed. Among them, the fluorescent light 3 emitted by the atomic group 2 through the vacuum cavity window 1 hits the front end of the integrated lens barrel 4, and the lens fixing snap ring 1 5, the first lens 6, the lens fixing snap ring 2 7 and the second lens in the lens barrel 8. The third lens fixing snap ring 9 , the third lens 10 , and the fourth lens fixing snap ring 11 are arranged coaxially in sequence. The second lens 8 adopts the mirror image arrangement of the doublet lens with the same performance parameters as the first lens 6, and the third lens 10 uses a positive meniscus lens, which reduces the loss of fluorescence collection and shortens the axial length of the entire device unit. The fluorescence emitted by the atomic group passes through the unit structure of the secondary imaging lens set to make the fluorescence converge 12 on the multi-pixel array detector 13 , and complete the data conversion processing through the signal acquisition and processing display 14 . Through the secondary imaging lens set unit, the size of the single imaging is greatly shortened, which solves the problem that the size of the fluorescence detection device is too large, and effectively reduces the influence of background atoms and stray light, improves the effective collection rate of light intensity signals, and realizes atomic end state detection.

Please refer to FIG. 2 for the Coriolis force to affect the velocity distribution of the atomic group. A method for compensating for the Coriolis force effect in fluorescence collection disclosed in this embodiment is realized by the following steps:

Step 1. The multi-pixel array detector converts the collected fluorescence light intensity signal of the atomic group into a voltage signal; the fluorescence light intensity of the atomic group is I ₀ , the unit is nW, the conversion efficiency of the detector is γ, the unit is W/A, The gain coefficient of the detector is ε, then the voltage value U=γ·ε·I ₀ .

Step 2: Calculate the radius x _i of the atomic group; at the time of Ti, each pixel of the multi-pixel array detector provides a voltage value, and a formula is fitted to obtain the curve _Uxi , and further obtain the radius of the atomic group _xi .

Step 3: Calculate the horizontal velocity v ₀ of the atomic group; the central position of the atomic group is x ₀ , and the initial horizontal velocity is v ₀ , corresponding to the two-layer detection, the following relationship is: x ₀ +v ₀ t _i = _xi .

其中Ω_E为地球自转角速度，v为原子团速度，k_eff为Raman光有效波矢，一般情况下沿着垂线方向，重力测量偏差主要由原子团的水平方向速度引起。Step 4: Calculate the gravitational acceleration deviation value Δg; when the gravitational acceleration is measured by the atomic interferometer on the surface of the earth, the direction of the effective wave vector k _eff of the Raman light rotates in the inertial coordinate system due to the influence of the earth's rotation, thus introducing Corio The Coriolis effect will eventually affect the measured gravity value, resulting in a deviation of Δg:

where Ω _E is the angular velocity of the earth's rotation, v is the velocity of the atomic group, and k _eff is the effective wave vector of Raman light. Generally, along the vertical direction, the gravity measurement deviation is mainly caused by the horizontal velocity of the atomic group.

Step 5. Compensation of the gravitational acceleration value; the system error introduced by the Coriolis force can be calculated to obtain Δg, and the final gravitational acceleration value is g: g=g ₀ +Δg. where g ₀ is the gravitational acceleration value obtained from the interference fringes measured by the atomic gravimeter experiment.

Wherein, in step 1, when the multi-pixel array detector collects the fluorescence light intensity signal, it is necessary to ensure that the multi-pixel array detector is located in the east-west direction of the atomic group;

Wherein the fitting curve _Uxi described in step 2 is realized by the following method:

1) Calculate the number of atoms

Taking the cold atomic cluster as a point, and taking the atomic cluster as the center of the circle, the solid angle opened by the detection surface of the detector is:

Among them, l is the distance between the center of the detector and the center of the atomic group, and r is the radius of the detection area of the detector. In order to eliminate the influence of background light, it must be detected twice, once with atomic groups and once without atomic groups, and subtract the values of the two detections to obtain the net fluorescence intensity. And to calibrate the photodiode, irradiate the photodiode with a beam of known intensity of laser light to measure the quantum effect of the photodiode (a = number of electrons/number of photons), the number of electrons emitted by the unit solid angle atomic group per unit time is NR _sc a , the current per unit solid angle is NR _sc a, where e is the electron charge.

If there is a difference between the output voltage of the amplifier and the input current: ΔU=β·ΔI, where the unit of β is v/mA, the voltage indication of the detector is:

Then the number of atoms in the atomic group is:

where R _sc is the light scattering rate, and Ω is the solid angle of the measurement area.

2) Density of atomic groups

After the number of atoms is measured, and then continue to detect according to the falling process of the atomic group, the distribution of atoms in the magneto-optical trap in three-dimensional space follows the Gaussian density distribution,

where σ _x , σ _y , and σ _z are the radii (radius of atomic clusters) at which the density of the atomic cloud in the x, y, and z directions drops to 1/e of the highest value. n ₀ is the maximum density, which is related to the total number of atoms in the group as follows:

Although the distribution of MOT over xoy is not completely symmetric, we assume σ _x =σ _y for simplicity. In this way, we only need to know the total number of atoms in the original group, the radius of the atomic group in the x direction and the radius of the atomic group in the z direction, and then we can calculate the density. At the maximum voltage value, the atomic group is the brightest, and the falling speed is roughly set to remain unchanged, and the equivalent atomic group radius can be calculated, and finally the density of the atomic group can be known.

3) Establish a fitting formula;

4) Fitting the curve _Uxi by approximating the Gaussian curve.

The above-mentioned specific descriptions further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned descriptions are only specific embodiments of the present invention, and are not intended to limit the protection of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. a method for compensating Coriolis effect in fluorescence collection, is characterized in that: comprise the steps, Step 1: The multi-pixel array detector converts the collected fluorescence light intensity signal of the atomic group into a voltage signal; The fluorescence intensity of the atomic group is I ₀ , the unit is nW, the conversion efficiency of the detector is γ, the unit is W/A, and the gain coefficient of the detector is ε, then the voltage value U=γ·ε·I ₀ ; Step 2. Calculate the atomic group radius x _i ; At time Ti, each pixel of the multi-pixel array detector provides a voltage value, and the formula is fitted to obtain the curve _Uxi , and further obtain the radius of the atomic group _xi ; Step 3: Calculate the horizontal velocity v ₀ of the atomic group; The center position of the atomic group is x ₀ , and the initial horizontal velocity is v ₀ . The relationship between the two layers of detection is as follows: x ₀ +v ₀ t _i = _xi Step 4. Calculate the gravitational acceleration deviation value Δg; When using an atomic interferometer to measure the gravitational acceleration on the earth's surface, the direction of the effective wave vector k _eff of the Raman light is rotated in the inertial coordinate system due to the influence of the earth's rotation, thereby introducing the Coriolis effect, which will affect the measurement. Gravity value, resulting in a deviation of Δg:

where Ω _E is the angular velocity of the earth's rotation, v is the velocity of the atomic group, and k _eff is the effective wave vector of Raman light. Generally, along the vertical line, the gravity measurement deviation is mainly caused by the horizontal velocity of the atomic group; Step 5. Compensation of the Coriolis force effect of the gravitational acceleration value is completed in combination with the experimental test values, that is, the Coriolis force effect is effectively overcome, the detection accuracy and uniformity of fluorescence detection are improved, and the fluorescence detection process in the field of cold atom physics is greatly improved. The physical parameter measurement signal-to-noise ratio and measurement accuracy; The systematic error introduced by Coriolis force is calculated as Δg, and the compensated gravitational acceleration value is g: g=g ₀ +Δg where g ₀ is the gravitational acceleration value obtained from the interference fringes measured by the atomic gravimeter experiment. 2. The method for compensating for Coriolis force effect in fluorescence collection according to claim 1, wherein: in step 1, when the multi-pixel array detector collects fluorescence light intensity signals, it is necessary to ensure that the multi-pixel array detectors The array detectors are located east-west of the atomic cluster. 3. the method for compensating Coriolis force effect in a kind of fluorescence collection as claimed in claim 2 is characterized in that: the method for fitting curve _Uxi described in step 2 is, Step 2.1: Calculate the number of atoms; The cold atomic group is equivalent to a point, and the atomic group is taken as the center of the circle, the solid angle opened by the detection surface of the detector is:

Among them, l is the distance between the center of the detector and the center of the atomic group, and r is the radius of the detection area of the detector; in order to eliminate the influence of the background light, it must be detected twice, once with atomic groups and once without atomic groups. and to calibrate the photodiode, irradiate the photodiode with a beam of laser light of known intensity to measure the quantum effect of the phototube (a=number of electrons/number of photons), the electrons emitted by the unit solid angle atomic group per unit time If the number is NR _sc a, the current per unit solid angle is NR _sc ae, where e is the electron charge; The output voltage of the amplifier and the input current are: ΔU=β·ΔI, where the unit of β is v/mA, then the voltage indication of the detector is:

Then the number of atoms in the atomic group is:

where R _sc is the light scattering rate, Ω is the solid angle of the measurement area; Step 2.2: Calculate the density of atomic groups; After the number of atoms is measured, and then continue to detect according to the falling process of the atomic group, the distribution of atoms in the magneto-optical trap in three-dimensional space follows the Gaussian density distribution:

where σ _x , σ _y , σ _z are the radius (radius of atomic group) when the density of the atomic cloud in the x, y, z directions drops to 1/e of the highest value; n ₀ is the maximum density, which is related to the atomic group The total number of atoms in has the following relationship:

Although the distribution of MOT on xoy is not completely symmetrical, for the convenience of the density of atomic groups, the following simplification is made: σ _x =σ _y ; it is only necessary to know the total number of atoms in the original group, the radius of the atomic group in the x direction and the atomic group in the z direction The radius, that is, the density of the atomic group can be calculated; the atomic group is the brightest at the maximum voltage value, and the falling speed is roughly set to remain unchanged, that is, the equivalent atomic group radius can be calculated, and then the density of the atomic group can be obtained; Step 2.3: Establish a fitting formula; Step 2.4: Fit the curve _Uxi by approximate Gaussian curve. 4. A device for compensating Coriolis force effect in fluorescence collection, for realizing a method for compensating Coriolis force effect in fluorescence collection as claimed in claim 1, 2 or 3, characterized in that: comprising a group of A lens set unit for reducing the influence of stray light and a multi-pixel silicon PIN photodiode for positioning the atomic space; by detecting the fluorescent signal emitted by the stimulated radiation of the atomic group in the vacuum cavity, the enhanced fluorescent signal is multi-imaged by the lens group. The element array detector is collected, and the radius of the atomic group is obtained by approximate Gaussian curve fitting, and then the deviation value of gravitational acceleration is calculated by the Coriolis force formula, and the compensation of the gravitational acceleration value is completed in combination with the experimental test value, that is, the Coriolis force effect is effectively overcome. , to further improve the measurement accuracy and uniformity, and greatly improve the physical parameter measurement, signal-to-noise ratio and measurement accuracy in the fluorescence detection process in the field of cold atom physics. 5. A device for compensating for Coriolis force effect in fluorescence collection as claimed in claim 4, characterized in that: by detecting the fluorescence emitted by the stimulated radiation of free-falling atomic groups in the vacuum cavity, the secondary imaging lens set unit Compared with the single imaging size, the size is greatly shortened, which solves the problem that the size of the fluorescence detection device is too large; and effectively reduces the influence of background atoms and stray light, improves the effective collection rate of light intensity signals, and realizes the detection of atomic final states. 6. A device for compensating for Coriolis force effect in fluorescence collection as claimed in claim 5, characterized in that: since the fluorescence signal emitted by the atoms excitedly radiated is weak, it is realized by a multi-pixel array detector of a high-gain detection device The photoelectric signal conversion greatly increases the gain of the detector through the secondary amplifier circuit, improves the ability to detect weak light intensity signals, and effectively improves the signal-to-noise ratio. 7. A device for compensating for Coriolis force effect in fluorescence collection as claimed in claim 6, characterized in that: it is mainly composed of vacuum cavity window, atomic group, fluorescence emission, integrated lens barrel, lens fixing snap ring, first lens, Lens fixing snap ring 2, second lens, lens fixing snap ring 3, third lens, lens fixing snap ring 4, fluorescence convergence, multi-pixel array detector, signal acquisition and processing display; atomic groups emitted through the vacuum cavity window Fluorescence, hit the front end of the integrated lens barrel, the lens fixing ring 1, the first lens, the lens fixing ring 2, the second lens, the lens fixing ring 3, the third lens, and the lens fixing ring 4 in the lens barrel. Coaxial arrangement; the second lens adopts the mirror image arrangement of the doublet lens with the same performance parameters as the first lens, and the third lens uses a positive meniscus lens, which reduces the loss of fluorescence collection and shortens the axial length of the entire device unit; atomic groups The emitted fluorescence is concentrated on the multi-pixel array detector through the secondary imaging lens set unit structure, and the data conversion processing is completed through the signal acquisition and processing display; through the secondary imaging lens set unit, the size of the single imaging is larger than that of the It can shorten the size of the fluorescence detection device to solve the problem that the size of the fluorescence detection device is too large, and effectively reduce the influence of background atoms and stray light, improve the effective collection rate of light intensity signals, and realize the detection of atomic final states.

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