[0029] The present invention is further detailed below with reference to the accompanying drawings.
[0030] Such as figure 1 As shown, the test of the present invention is carried out in a 5-magnetic shield bucket made of slope monotomy, and the magnetic shield tub can shield the interference of the ground magnetic field and the external stray magnetic field. The atomic cell containing the Herriott multi-reflection chamber is the core portion of the atomic gyroscope. When the atom gyroscope is working, it is used to measure the rotation information inside the atomic cell. The atomic gas chamber is used in conjunction with a 3D print platform, so that the steps of the optical path adjustment are omitted. The atom is required in the actual work, because the high temperature can obtain a larger signal, thereby increasing the signal-to-noise ratio. In order to achieve this working temperature, heating the atomic pool is heated using an autonomous two-piece non-magnetic heating sheet. At the same time, the thermal insulation is required to be wrapped to the thermal insulation while reducing the need for heat insulation, while the 铷 atom is pumped, and the polarization is transmitted to Xenon by collision. The detecting light is a linearly polarized light with respect to the blue atom D1 line, and the action distance from the alkali metal atom is increased by the multi-reflection chamber. In principle, the experimental signal comes from the Faraday optical effect of detecting light, the polarization of the detecting light is measured by the photodetector, and the optical signal is changed to the electrical signal, and the signal acquired by the photodetector is input to the phase amplifier. The phase-locked amplifier uses phase sensitive detection techniques to demap the modulation frequency in the detection signal. 129 XE and 131 Part of the resonant frequency of the XE. On the other hand, the oscillator provides an excitation field that drives the xenon atomic, and the phase-locked loop is composed of the varying device, the low pass filter, and the voltage controlled oscillator, which can lock the input phase by changing the drive field frequency. On the fixed value, such an oscillator can always maintain the output excitation magnetic field frequency in the xenon resonance frequency. The magnetic field unit is a magnetic field coil including X, Y, and Z, Y and Z directions, respectively, for providing the offset magnetic field and excitation magnetic field in the test, respectively, the coil in the X direction. The frequency measurement acquisition system measures the output frequency of the oscillator to derive the rotational information of the gyroscope.
[0031] The Herriott multi-reflective cavity is fixed to the silicon wafer by the anode bonding method, both of which are cylindrical, the spacing of 19.2 mm, and the spindle is 52.2 °. After the cavoscope is bonded to the silicon wafer, the glass cover is reused using an anode bonding to achieve a seal of the silicon wafer, and the charge of the atom needs to be realized through the tail tube on the glass cover. All atoms are charged into the atomic cell. After that, the atomic pool was taken from the vacuum system by flame burning, and the atomic tank containing the multi-reflection chamber was completed.
[0032] The heating unit is heated by AC power by both the non-magnetic heating sheet by AC; while heating requires an insulating material to partially wrap the atomic chamber part of the atomic cell to function as a heat insulation. Reduce the need for heating power, after the 铷 atom is pumped, the polarization is transmitted to Xenon by collision.
[0033] The use of the atomic pool containing a multi-reflective chamber can effectively improve the alkali metal magnetic sensitivity while maintaining the system miniaturization. In general, in an atomic tank of the alkali metal atom and an inert gas atom, the alkali metal magnetic instrument sensitivity limits the sensitivity of the nucleus and magnetic gauges, thereby limiting the gyroscope performance. Using an atomic tank containing a multi-reflective chamber containing a multi-reflection chamber such that the system does not need additional additional modulation to increase the measured signal-to-noise ratio, avoiding additional modulation to system stability interference.
[0034] The object of the present invention is achieved by the following technical solutions:
[0035] 1. Produce an atomic cell containing a multi-reflection chamber of the Herriott and charged into the atom. Under the auxiliary of the mold, the method of using an anode is first secured to the silicon wafer at the bottom of the atomic pool according to the pre-design position, and then use the same method to bond the glass cover with the bottom silicon blade. For a whole. After the bonding, the atomic pool length is 30 * 18 * 17mm, and the internal Herriott multi-reflective chamber is 12.7mm, the cylinder diameter is 12.7mm, the thickness is 2.5mm, the radius of curvature is 100mm, and the two cylindrical mirror is 19.2mm. The spindle is relative to the corner 52.2 °. The front cavity center opening 2.5 mm diameter small hole, the detection light is incident from the small hole at an angle at a horizontal 5 ° to a multi-reflective chamber, and is emitted from the same aperture after 21 times. The atomic pool is filled into the natural abundance 铷 atom (where 85 RB and 87 The content of Rb is 72.2% and 27.8%, respectively, 3 Torr 129 XE, 35TORR 131 XE, 5TORR hydrogen and 150 torr nitrogen as a buffer gas.
[0036] 2. Pumping the light and detect the light path system. The regulating the laser controller resonates the pumping optical frequency and the 铷 atom D1 line after the cushioning gas is wider, and then the quarter wave plate is changed to a circularly polarized light, and then the atom is used to polar atoms. Using the photodetector to measure the transmission of the transmitted light, the transmission power of the pumping light is not changed by the method of transmitting the transmitted light, and the transmission of the ingenization is unchanged. The detection light relative to the linear polarized light of the 铷 atom D1 line, the deduplication amount is optimized to minimize phase noise. The light is detected to be incident in a multi-reflection chamber incident in the atomic chamber perpendicular to the pumping light, and the signal of the detective light is received using a differential photodetector using a differential photodetector.
[0037] 3. Main magnetic fields and transverse excitation magnetic fields. In the z-direction magnetic field coil of the magnetic field unit, a suitable size of the magnetic field is added, and the main magnetic field is at 160 mg. The use of a different radio frequency excitation magnetic field in the Y direction is used to drive the xenon isotope in the direction perpendicular to the direction of the magnetic field. in 129 XE and 131 The size of the frequency of the XE is scanned near the frequency. The phase of the obtained xenon signal is detected and the frequency distortion of the excitation magnetic field. Thus, the phase signal can be fed back to the frequency of the excitation magnetic field by the phase-locked loop loop, thereby achieving the excitation field frequency constant. The extension magnetic field frequency of the Y direction during operation of the gyroscope 129 XE and 131 The Ramo frequency of XE maintains resonance.
[0038] 4. Photoelectric detector collects data, lock amplifier processing data, and the oscillator outputs the excitation magnetic field frequency. The photodetector obtains the detecting optical signal into the phase-locked amplifier, and the reference signal of the phase-locked amplifier is provided by the built-in oscillator, and it also provides an exciting field signal that drives the xenon isotope. The phase information of the phase-locked amplifier can be transferred to the phase locked loop to achieve a closed loop. When the external fluctuation causes the frequency of the excitation magnetic field to deviate from the resonance point, the phase output of the phase-locked loop will feed back the oscillator by controlling the circuit. Change the frequency of the excitation magnetic field to achieve closed loop operation. At the same time, the feedback signal also provides information on the rotational conditions, which is the angle of rotation, and realizes the function of the gyroscope.
[0039]5. Atomic gyroscope work process. The magnetic field unit containing the Herriott multi-reflective chamber, the magnetic field units in the X, Y, and Z direction are placed in a five-layer magnetic shield tank, and the magnetic shield bucket can function as a shielded external stray magnetic field, such as the influence of the ground magnetic field. It can be greatly suppressed, providing a pure magnetic field environment for the internal atom. Other constituent units are placed on the platform to collect experimental data, and then processes the data. The non-magnetic heating sheet designed by its own is heated by AC, and the temperature needs to reach approximately 110 ° C, so that the atom is in a stable high atom number density to ensure a sufficiently high signal-to-noise ratio. Pumping light should continue to polarize the 铷 atom during the working process of the atomic gyroscope, and transmit polarization by collision to the 氙 atom, and output the rated size of the rated size through the current source on the z direction magnetic field coil. The magnetic field is also generated. Under the conditions of size 160 mg, the polarized xenon atom is driven by the excitation magnetic field applied by the Y direction magnetic field unit, and the polarization of the partial xenon can be in the direction of the excitation magnetic field in a direction perpendicular to the magnetic field, when the frequency of the magnetic field When the size is equal to the Ramo moving frequency of the Xenxin, the signal is the highest. The detecting light increases the action distance from the atom after passing through the multi-reflective chamber. Its action is to convert the detective optical signal into an electrical signal by the photodetector to convert the detective light signal to the electrical signal, acquired. The signal output enters the phase lock amplifier to demodulate the processing, the amplitude and phase information of the xenon feeding signal is demodulated by the frequency of the excitation magnetic field, respectively. The phase of the xenon feeding signal demodulated by the phase-locked amplifier is a dispersion relationship between the frequencies of the excitation magnetic field. The excitation magnetic field frequency is corresponding to the midpoint of the dispersion curve, and is also the most sensitive point of the relative magnetic field change, and the response of the signal is also the largest. This point is closed as a lock-locked loop to lock the set point, so that the system can be in a closed-loop operating state. In order to reduce the source of noise, the signal output of the oscillator is used as an excitation magnetic field, applied to the Y direction magnetic field coil for driving the homon atom. The rotation of the outside can be equivalent to the change amount of the bias magnetic field, and the rotation causes a change in the closed loop feedback signal of the phase locked loop, and the excitation magnetic field frequency output from the oscillator is also changed. In the frequency measurement, the feedback to the acquisition frequency can realize the detection of the rotation, so that the nuclear magnetic resonance atom gyroscope based on the multi-reflective chamber can measure the rotation information, the function of the multi-reflective chamber based nuclear magnetic resonance atomic gyroscope can be realized. .
[0040] Such as figure 2 As shown, the prostatal mirror 1 and the rear mirror 2 constituting the Herriott multi-reflection chamber are fixed to the silicon sheet 4 by the anode bonding, and the two cavoscopes are cylindrical, the spacing is 19.2mm, and the spindle is 52.2 °. . The glass cover 3 is a seal of the silicon bladder 4 after the cavity is bonded to the silicon sheet 4. The atomic charge needs to be realized by the tail pipe on the glass cover. After the atom is charged into the atomic cell, it is finally taken from the vacuum system from the vacuum system by flame burning, and the atomic pool containing the multi-reflection chamber is completed.
[0041] image 3 The pumping light and detecting light path of the nuclear magnetic resonance resonator are shown. Pumping light is first coupled into the cone amplifier to increase the power of the low transport light. The locking of the pumping optical power can be achieved by the variation of the transmitted light size after the atomic cell. The specific practice is to form a PID feedback system using the transmitted optical signal, and the feedback signal is used to ensure the stability of the atomic polarization. Pumping light enters the atomic cell to become a circularly polarized vibration light through quarter. The detective light is subjected to the optical fiber after the laser is transmitted and passed through the sound modulator (AOM), and then it is then passed from the fiber into the Herriott multi-reflective chamber in the atomic cell. After 21 reflections, it is divided into two bunsings by the polarization beam. When the initial no progress signal is initially, the adjustment makes the two beam of light levels, the differential output is zero, the differential output is used as the input signal of the two phase lock amplifiers to achieve differential detection. The two photodetector outputs and inputs to the PID controller as a feedback signal to control the sound modulator (AOM) lock detection light intensity.
[0042] Figure 4 The atomic cell is shown in combination with the 3D print platform 6, and the pumping light is entered into the atomic cell through the window. The detecting photoclaved output head 5 is specially designed, manufactured by a 3D printing method, integrated output collimation lens, so that the detector is no longer needed after the optical fiber output, can be used directly. At the same time, with the help of 3D printing technology, it can accurately define the incident relationship between the light and the multi-reflection chamber, so that the cumbersome optical path adjustment is eliminated.
