CN107009032A - A kind of atomic air chamber tail pipe device for fusing and atomic air chamber tail pipe blowout method - Google Patents

Abstract

The invention provides an atomic gas chamber tailpipe fusing device and an atomic gas chamber tailpipe fusing method, wherein the atomic gas chamber tailpipe fusing device of the present invention includes a carbon dioxide laser, an atomic gas chamber fixture, a stepping motor rotating system and three Axis stage. A carbon dioxide laser is used as a heating source, and a laser with a wavelength of 10.6 μm is emitted from top to bottom. The atomic gas chamber fixture fixes the atomic gas chamber on the motor shaft and fixes the motor on the three-axis translation stage. The above-mentioned device is used to carry out follow-up treatment on the preliminarily produced atomic gas chamber, and the excessively long tail pipe of the gas chamber is removed, thereby reducing the size of the atomic gas chamber and meeting the requirement of miniaturization. The gas chamber after the fuse of the tail pipe not only greatly reduces the size, but also greatly improves the overall temperature control of the gas chamber and the relaxation rate of the inert gas nuclei in the gas chamber, which improves the performance of the atomic sensor head.

Description

An atomic gas chamber tailpipe fusing device and an atomic gas chamber tailpipe fusing method

technical field

The invention relates to the technical field of atomic gas chamber preparation, in particular to an atomic gas chamber tailpipe fusing device and a method for atomic gas chamber tailpipe fusing. The processed gas chamber can be applied to ultra-high sensitivity measurement based on the interaction between light and atoms device.

Background technique

The atomic air chamber is the physical head of ultra-high sensitive measurement devices based on the interaction between light and atoms, such as atomic clocks, atomic magnetometers, and atomic gyroscopes, and is the core sensitive component. Among them, the nuclear magnetic resonance gyroscope is an atomic gyroscope that uses the Larmor precession of the atomic magnetic moment in the magnetic field as a reference to measure the angular velocity of the inertial carrier. High precision and miniaturization are the current development trends of nuclear magnetic resonance gyroscopes. The size of the atomic gas chamber severely limits the miniaturization of the nuclear magnetic resonance gyroscope. In the traditional process of making the atomic gas chamber, the atomic gas chamber is usually removed from the vacuum pipeline with an oxyhydrogen flame. The cut-off position should not be too close to the gas chamber, otherwise it will cause alkali metal escape or high temperature deformation of the gas chamber. Therefore, the tail pipe of the atomic gas chamber made by the traditional technology is relatively long, and it is difficult to further shorten it. Therefore, in order to meet the requirements of miniaturization of the gas chamber, it is urgent to find a method of post-treatment of the gas chamber. On the basis of the gas chamber produced by the traditional process, the tailpipe of the gas chamber is further processed, so as to achieve the miniaturization of the gas chamber requirements.

Contents of the invention

The purpose of the present invention is to reduce the tailpipe size of the atomic gas chamber used in the nuclear magnetic resonance gyroscope, so that the atomic gas chamber meets the miniaturization requirements of the nuclear magnetic resonance gyroscope. In addition, the shortening of the gas chamber tailpipe can increase the relaxation time of the inert gas nuclei in the atomic gas chamber and reduce the electric quadrupole splitting of the inert gas nuclei in the atomic gas chamber, thereby improving the performance index of the nuclear magnetic resonance gyroscope.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

An atomic gas chamber tailpipe fusing device, comprising a carbon dioxide laser (1), a stepping motor system (3), an atomic gas chamber fixture (4) and a three-axis displacement stage (5), wherein the carbon dioxide laser (1) Located at the top, an infrared laser with a wavelength of 10.6 μm is emitted from top to bottom for fusing the gas chamber tailpipe (14), and the atomic gas chamber fixture (4) fixes the atomic gas chamber on the stepper motor shaft, and the stepper motor It is fixed on the three-axis translation stage (5).

In the above-mentioned atomic gas chamber tailpipe fusing device, the wavelength of light emitted by the carbon dioxide laser (1) is 10.6 μm, and the glass material has a high absorption rate of light of this wavelength, which is very suitable for heating the glass material. The minimum spot diameter of the carbon dioxide laser (1) is 0.02mm, which can precisely control the fusing position. The output power of the carbon dioxide laser (1) is 55W, which is enough to heat the quartz glass tube to about 2000°C.

In the above atomic gas chamber tailpipe fusing device, the stepping motor system (3) consists of three parts: a controller, a driver and a stepping motor, which can precisely control the speed of the motor. The stepping motor is fixed on the base of the atomic gas chamber fixture (4), the output end of the driver is connected with the stepping motor, and the input end is connected with the controller.

In the above-mentioned atomic gas chamber tailpipe fusing device, the atomic gas chamber tooling fixture (4) includes: motor base (12), tooling base (15), slide block (16), motor shaft stabilizer (17), chuck (18). The tooling base (15) is fixed on the three-axis displacement platform (5), the motor base (12), the motor shaft stabilizer (17) are fixed on the tooling base (15), and the stepping motor is fixed on the motor base (12), The hole of motor shaft and motor shaft stabilizer (17) is concentric. The first chuck (18) on the left side is fixed on the motor shaft. Slide block (16) is inserted in the chute on the right side of frock base (15), and the second chuck (18) on the right side is fixed on the top of slide block (16). Slide block (16) is made of three parts of slide block seat, slide block arm and chuck, and slide block seat and slide block arm are vertical mutually, are fastened by three screws. The chuck is fixed vertically on the slider arm via a flange connection.

In the above-mentioned atomic gas chamber tailpipe fusing device, the three-axis displacement table (5) can precisely control the position of the gas chamber tailpipe, and by adjusting the three threaded rods corresponding to the three directions, the space where the gas chamber tailpipe is located can be adjusted. The position moves to near the laser focus.

A method for fusing an atomic gas chamber tailpipe, comprising the steps of:

(1), the longer atomic gas chamber (14) of the tailpipe that has been preliminarily manufactured is installed in the chuck on the motor shaft, and the tailpipe direction is outward.

(2), allow slide block (16) to be close to atomic gas chamber (14), block the end of atomic gas chamber (14) tailpipe with the chuck on the slide block (16).

(3) Adjust the three-axis translation stage (5) to move the tailpipe of the air chamber to the vicinity of the laser focus position.

(4), start the stepper motor system (3), and the motor starts to drive the air chamber to rotate.

(5) Adjust the spot size and light output power of the carbon dioxide laser (1).

(6) Turn on the laser and start heating the fusing position.

(7) Continue heating for 5s, the fusing position melts, slowly pull the slider (16), and the fusing position is automatically twisted.

(8) Turn off the laser and stop heating. Turn off the motor. Take out after the atomic gas chamber (14) cools down.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The tailpipe fusing method of the atomic gas chamber of the present invention, on the basis of the traditional atomic gas chamber manufacturing process, performs post-processing on the tailpipe of the atomic gas chamber, so that the size of the processed gas chamber can be greatly reduced. In the traditional flame fusing method, if the fusing position is too close to the gas chamber, the alkali metal atoms inside the gas chamber will escape, and even cause the gas chamber to be heated and deformed, reducing the performance of the gas chamber.

(2), the atomic gas chamber tailpipe fusing method of the present invention removes the redundant part of the atomic gas chamber tailpipe, increases the central symmetry of the gas chamber, thereby reduces the electric quadrupole relaxation of the inert gas nuclei in the gas chamber, Improved the performance of the Atomic Gas Chamber.

Description of drawings

Fig. 1 is a schematic diagram of a device for fusing the tailpipe of an atomic gas chamber according to the present invention.

Fig. 2 is a schematic diagram of the fixture and an installation diagram of the gas chamber of the present invention.

Fig. 3 is a perspective view of the slider (16) in the fixture of the present invention.

Figure 4 is a schematic diagram of a stepper motor system.

Figure 5 is a comparison of the size of the air chamber before and after the tailpipe fusing.

Fig. 6 Flow chart of the fusing process of the tailpipe of the atomic gas chamber.

detailed description

Below in conjunction with accompanying drawing, the present invention is described in further detail:

As shown in Fig. 1 and Fig. 2, atomic gas chamber tailpipe fusing device of the present invention comprises carbon dioxide laser (1), stepping motor system (3), atomic gas chamber fixture (4) and three-axis translation stage (5) . Among them, the carbon dioxide laser (1) is located at the top, and emits an infrared laser with a wavelength of 10.6 μm from top to bottom for fusing the gas chamber tailpipe (14). The maximum laser power is 55W, and the minimum diameter of the spot is 0.02mm. The atomic gas chamber tooling fixture (4) fixes the atomic gas chamber on the stepping motor shaft, and fixes the stepping motor on the three-axis translation platform (5), which ensures the stability of the fusing point position during the entire fusing process. By adjusting the three-axis displacement stage (5), the fusing point of the tailpipe can be moved to the vicinity of the focus position of the light beam, which ensures the effective use of laser energy and the heating of the fusing point to a sufficiently high temperature.

The stepping motor system (3) is composed of three parts: a controller, a driver and a stepping motor (11), as shown in Fig. 2, and can precisely control the speed of the motor. The stepping motor is fixed on the base of the atomic gas chamber fixture (4), the output end of the driver is connected with the stepping motor, and the input end is connected with the controller. The model of the stepper motor is 86BYG two-phase four-wire stepper motor, the model of the stepper motor controller is DKC-S100, the model of the stepper motor driver is MA860H, the input voltage is DC 24-110V, the input current is less than 8A, and the output current 2.0～7.8A. The function of the controller is to generate a pulse signal with a certain period, generate a direction signal and an enable signal. After the driver receives the periodic pulse signal transmitted by the controller, it distributes and amplifies the power of the pulse signal. The amplified pulse signal directly acts on the coils of each phase of the stepping motor to drive the two-phase stepping motor to rotate (A+, A- are the positive and negative poles of the first phase, B+, B- are the positive and negative poles of the second phase Pole), as shown in Figure 4.

The atomic gas chamber tooling fixture (4) comprises: a motor base (12), a tooling base (15), a slide block (16), a motor shaft stabilizing frame (17), and a chuck (18). The tooling base (15) is fixed on the three-axis displacement table (5), the motor base (12), the motor shaft stabilizer (17) are fixed on the tooling base (15), and the stepper motor is fixed on the motor base (12). The hole concentricity of motor shaft and motor shaft stabilizer (17). The first chuck (18) on the left side is fixed on the motor shaft. Slide block (16) is inserted in the chute on the right side of frock base (15), and the second chuck (18) on the right side is fixed on the top of slide block (16). Slider (16) is made of three parts of slider seat, slider arm and chuck, and as shown in Figure 3, slider seat and slider arm are vertical mutually, are fastened by three screws. The chuck is fixed vertically on the slider arm via a flange connection. Wherein, the position of the chuck on the slide block can be adjusted, thereby ensuring that the chuck on the slide block (16) remains coaxial with the chuck on the motor shaft stabilizer (17).

In the present invention, since the laser is emitted from top to bottom, it can only irradiate one surface. Therefore, in order to ensure that the melting point is heated evenly, a stepping motor is required to drive the atomic gas chamber to rotate.

Adopt the atomic gas chamber tailpipe fusing device of the present invention to realize the fusing method of the atomic gas chamber tailpipe, as shown in Figure 6, comprising the following steps:

1) Install the atomic gas chamber (14) with a long tailpipe preliminarily manufactured by the traditional flame fusing method into the chuck on the stepper motor shaft. During installation, the tailpipe of the atomic gas chamber needs to be directed outward. The tailpipe of the atomic gas chamber should be kept horizontal, and the shaft center is coaxial with the rotating shaft of the motor.

2) Put the slide block (16) on the tooling base (15) close to the atomic gas chamber (14), and block the end of the atomic gas chamber (14) tailpipe with the chuck on the slide block (16). The chuck on the slide block (16) needs to be coaxial with the chuck on the opposite motor shaft stabilizer (17).

3) By adjusting the three-axis translation stage (5), the fusing point of the gas chamber tailpipe is moved to the vicinity of the laser focus position. Since the light emitted by the carbon dioxide laser is invisible light, the atomic gas chamber can be removed first, and the atomic gas chamber can be installed after the laser focus position is determined with this metal plate.

4) Start the stepping motor system (3), so that the motor drives the air chamber to rotate. The speed of the stepper motor can be adjusted arbitrarily, and it should not be too fast, preferably around 1 revolution/second.

5) According to the difference in size of the tailpipe of the atomic gas chamber and the difference in glass material, the size of the emission spot and the output light power of the carbon dioxide laser (1) are adjusted. The determination of the spot size and output light power requires multiple trials to select the appropriate parameters. In the present invention, a light spot with a diameter of Φ3mm and a power of 55W is used.

6) Start the laser and start heating the fusing position.

7) Continue heating for about 5s, and when the fusing point melts, slowly pull the slider (16) apart, and the fusing point will be automatically twisted.

8) Turn off the laser and stop heating. Stop the motor. Take out after the atomic gas chamber (14) cools down.

The size of the gas chamber before and after fusing is shown in Figure 5. The size of the air chamber in the picture is 4×4×4mm, and the outer diameter of the tail pipe is Φ3mm. The length of the shortened front tailpipe is >10mm, and the length of the shortened rear tailpipe is ≈2mm.

The above description is only a specific implementation method of the present invention, but the scope of protection of the present invention is not limited thereto. Any relevant person familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present invention. , should be covered within the protection scope of the present invention.

The content that is not described in detail in the specification of the present invention belongs to the well-known technology of those skilled in the art.

Claims (6)

1. a kind of atomic air chamber tail pipe device for fusing, it is characterised in that：Including carbon dioxide laser (1), stepping motor system (3), atomic air chamber frock clamp (4) and three-shaft displacement platform (5), wherein, carbon dioxide laser (1) is located at top, from upper Under send the infrared laser of 10.6 μm of wavelength and be used to fuse air chamber tail pipe (14), atomic air chamber frock clamp (4) is by atomic air chamber It is fixed on step motor shaft, and stepper motor is fixed on three-shaft displacement platform (5).

2. a kind of atomic air chamber tail pipe device for fusing as claimed in claim 1, it is characterised in that：The carbon dioxide laser (1) a diameter of 0.02mm of minimum light spot, can accurately control the position that fuses, and the light power of carbon dioxide laser (1) is 55W。

3. a kind of atomic air chamber tail pipe device for fusing as claimed in claim 1, it is characterised in that：The stepping motor system (3) be made up of controller, driver and the part of stepper motor (11) three, can accurate controlled motor (11) rotating speed, wherein walking Stepper motor (11) is fixed on the base of atomic air chamber frock clamp (4), and the output end of driver is connected with stepper motor, input End is connected with controller.

4. a kind of atomic air chamber tail pipe device for fusing as claimed in claim 1, it is characterised in that：The atomic air chamber frock folder Tool (4) includes：Motor cabinet (12), tooling base (15), sliding block (16), motor shaft steady rest (17), wherein dop (18), frock Base (15) is fixed on three-shaft displacement platform (5), and motor cabinet (12), motor shaft steady rest (17) are fixed on tooling base (15) Face, stepper motor is fixed on motor cabinet (12), and motor shaft and the hole of motor shaft steady rest (17) are concentric；First, left side card Head (18) is fixed on motor shaft；On the right side of sliding block (16) insertion tooling base (15) in chute, second, right side dop (18) is solid It is scheduled on the top of sliding block (16)；Stepper motor (11) is arranged on motor cabinet (12)；Sliding block (16) is by take-up housing, slider arm and card First three part is constituted, and take-up housing is mutually perpendicular to slider arm, passes through three screws tightens；Dop is vertical fixed by flange connection On slider arm, wherein, the dop position on sliding block can be adjusted, so as to ensure that dop and motor shaft on sliding block (16) are stable Dop on frame (17) keeps coaxial.

5. a kind of atomic air chamber tail pipe device for fusing as claimed in claim 1, it is characterised in that：The three-shaft displacement platform (5), By adjusting corresponding three threaded rods in three directions, the locus where air chamber tail pipe is accurately controlled, is moved into Near laser spot.

6. a kind of atomic air chamber tail pipe blowout method, it is characterised in that：Comprise the following steps：

1) the longer atomic air chamber of the tail pipe tentatively completed (14) is installed in the dop on motor shaft, tail pipe direction to Outside；

2) allow sliding block (16) close to atomic air chamber (14), the end of atomic air chamber (14) tail pipe is blocked with the dop on sliding block (16) End；

3) regulation three-shaft displacement platform (5), air chamber tail pipe is moved near focal position of laser；

4) stepping motor system (3) is started, motor starts to drive air chamber to rotate；

5) spot size and light power of regulation of carbon dioxide laser (1)；

6) start laser, start to the heating of fusing position；

7) continuous heating 5s, fusing position is melted, and sliding block (16) is slowly pulled open, and fusing position is twisted automatically；

8) laser is closed, stops heating, motor is closed, taken out after after atomic air chamber (14) cooling.