CN115469369A - Cold atom Raman reflector installation error angle correction method - Google Patents
Cold atom Raman reflector installation error angle correction method Download PDFInfo
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- CN115469369A CN115469369A CN202210805880.4A CN202210805880A CN115469369A CN 115469369 A CN115469369 A CN 115469369A CN 202210805880 A CN202210805880 A CN 202210805880A CN 115469369 A CN115469369 A CN 115469369A
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V7/00—Measuring gravitational fields or waves; Gravimetric prospecting or detecting
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V13/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00
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Abstract
The invention relates to a cold atom gravimeter installation error angle calibration method, relates to the field of gravity measurement, and aims to solve the problems of complex leveling steps and long adjusting time of a Raman reflector in a traditional cold atom gravimeter. The method comprises the steps of installing optical fibers among three adjusting screws on the back of a Raman reflector, forming an FP interference cavity by the end face of each optical fiber and the back of the Raman reflector, calculating the inclination angle of the Raman reflector through combination of three interference fringes, and compensating the inclination angle to the output of a cold atom gravimeter after weighted integration. The method avoids the complex debugging process of the cold atom gravimeter after changing the working environment, only needs to calibrate once in a laboratory, and can directly compensate the inclination angle of the reflector subsequently, thereby being beneficial to the rapid deployment of the field operation of the cold atom gravimeter and improving the reliability of the field operation of the cold atom gravimeter.
Description
Technical Field
The invention belongs to the field of gravity measurement, and particularly relates to a cold atom Raman reflector installation error angle correction method.
Background
Gravitational acceleration values are of great importance in geology, and reflect the internal structure of the earth, which changes with time and position. The global gravity measurement can play an important role in the aspects of ground level restoration, resource exploration and monitoring, inertial navigation assistance and the like. Cold atom gravimeters generally adopt three-beam Raman light to control cold atom groups so as to realize substance wave interference and further solve and calculate a local gravity acceleration value. Compared with the traditional zero-length spring gravimeter, the cold atom gravimeter has the advantages of no mechanical wear, high sensitivity and high measuring frequency. However, the cold atom gravimeter needs to be horizontally calibrated for each movement of the cold atom gravimeter, and the operation mode is complex in steps and not beneficial to rapid deployment of the cold atom gravimeter in the field measurement process.
In order to solve the problems, the invention provides a calibration method capable of measuring the installation error angle of a Raman reflector in real time, the installation error angle of the Raman reflector of a cold atom gravimeter is calculated by measuring the installation between the Raman reflector and a cold atom interference cavity, the installation error angle is compensated to the measured value of the cold atom gravimeter after weighted integration, the induction axis of the cold atom gravimeter can be kept coincident with the gravity acceleration direction in the working process, and the output precision of the cold atom gravimeter is ensured.
Disclosure of Invention
The invention aims to overcome the defects of the traditional calibration technology, provides a simple and quick cold atom gravimeter Raman reflector installation error angle calibration method, can realize real-time compensation of the cold atom gravimeter installation error angle, ensures the output precision of the cold atom gravimeter and improves the reliability of the instrument.
The above object of the present invention is achieved by the following technical solutions:
a cold atom gravimeter Raman reflector installation error angle calibration method comprises a cold atom interference cavity (1), a Raman reflector (2), a first Fabry-Perot (FP) interference probe (3-1), a first FP interference reflector (4-1), a second FP interference probe (3-2), a second FP interference reflector (4-2), a third FP interference probe (3-3), a third FP interference reflector (4-3), a Raman reflector adjusting base (5), a 1550nm laser (6), an optical fiber circulator (7), a photoelectric detector (8) and a 1550nm single-mode optical fiber (9). It is characterized in that
The inner diameter of the hole in the FP interference probe 3 is 125 μm;
the FP interference probe 3 is positioned below the FP interference reflector 4;
the FP interference probes 3-1, 3-2 and 3-3 form an isosceles triangle at the periphery of the Raman reflector, and the distance between every two interference probes is a;
the 1550nm single-mode optical fiber 9 is cut flat by an optical fiber cutting knife after a coating layer is removed, then the 1550nm single-mode optical fiber passes through a middle hole of the FP interference probe 3, the front end face of the 1550nm single-mode optical fiber 9 is flush with the top of the FP interference probe 3, and the rear end face of the 1550nm single-mode optical fiber 9 is connected with a port 2 of the circulator;
the FP interference reflector 4 has a reflectivity of more than 99% to 1550nm laser;
the 1550nm laser 6 is connected with the port 1 of the circulator and used for detecting the sending of laser;
the photodetector 8 is connected with the port 3 of the circulator and is used for receiving the FP interference signal.
The invention has the beneficial effects that: the Raman reflector error monitoring function of the cold atom gravimeter is realized, the displacement and the inclination angle of the Raman reflector can be measured simultaneously based on the FP interference structure, the rapid calibration of the cold atom gravimeter in the field work is realized, and the measurement efficiency of the cold atom gravimeter is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a sensing probe;
FIG. 3 is a schematic view of a sensor probe installation
The specific implementation mode is as follows:
the following is a further description of the present invention,
step 1: the interference signal received by the photodetector 8 is output as
Wherein E 1 Is 1550nm single modeReflected signal of end face of optical fiber 9, E 2 A signal E passing through the photodetector 8 is a reflected signal of the FP interference mirror, λ =1550nm, and z is a distance between the end face of the 1550nm single-mode optical fiber 9 and the FP interference mirror 3 2 The change can be used for calculating the distance change between the end surface of the 1550nm single-mode optical fiber 9 and the FP interference reflector 3;
step 2: taking the FP interference probe 3-1 as the origin, the reference coordinates of the three are (0,0,0), (a, 0,0), (acos 60 °, asin60 °, 0), and the normal vector of the reference plane is n 0 ＝[0,0,asin60°]；
And 3, step 3: after the cold atom gravimeter is carried or dynamically tested, the position of a Raman reflector in the cold atom gravimeter changes, and the coordinate of the interference probe 3-1 is converted into (x) 1 ,y 1 ,z 1 ) Coordinate transformation of the interference probe 3-2 into (x) 2 ,y 2 ,z 2 ) Coordinate transformation of the interference probe 3-3 into (x) 3 ,y 3 ,z 3 ) Wherein z is 1 ,z 2 ,z 3 Respectively obtained by step 1, x 1 ,y 1 ,x 2 ,y 2 Obtained by solving the following equation:
and 4, step 4: three interference probe coordinates (x) obtained by step 1 and step 3 1 ,y 1 ,z 1 )，(x 2 ,y 2 ,z 2 ) And (x) 3 ,y 3 ,z 3 ) And real-time computing the normal vector of the dynamic plane as
Wherein
Step 6: calculating the output phase delta phi of the cold atom gravimeter according to the vertical deviation angle theta obtained in the step 5:
ΔΦ＝k eff gT 2 (1-θ 2 )
further obtaining the measurement deviation value delta g of the cold atom gravimeter caused by the installation deviation of the Raman reflector
Δg＝-θ 2 g
In the actual measurement process, the gravity measurement deviation value needs to be compensated into the output of the cold atom gravimeter.
Claims (8)
1. A cold atom gravimeter Raman reflector installation error angle calibration device comprises a cold atom interference cavity (1), a Raman reflector (2), a first Fabry-Perot (FP) interference probe (3-1), a first FP interference reflector (4-1), a second FP interference probe (3-2), a second FP interference reflector (4-2), a third FP interference probe (3-3), a third FP interference reflector (4-3), a Raman reflector adjusting base (5), a 1550nm laser (6), an optical fiber circulator (7), a photoelectric detector (8) and a 1550nm single-mode optical fiber (9);
2. the cold atom gravimeter Raman reflector installation error angle calibration device according to claim 1, wherein the inner diameter of a hole in the FP interference probe (3) is 125 μm, and the FP interference probe is located below the FP interference reflector (4);
3. the cold atom gravimeter Raman reflector installation error angle calibration device according to claim 1, wherein the FP interference probe (3-1), (3-2) and (3-3) form an isosceles triangle at the periphery of the Raman reflector, and the distance between every two is a;
4. the cold atom gravimeter Raman reflector installation error angle calibration device according to claim 1, wherein a 1550nm single-mode optical fiber (9) is cut flat by an optical fiber cutter after a coating layer is removed, and then passes through a middle hole of the FP interference probe (3), the front end face of the 1550nm single-mode optical fiber (9) is flush with the top of the FP interference probe (3), and the rear end face of the 1550nm single-mode optical fiber (9) is connected with a port (2) of a circulator;
5. the cold atom gravimeter raman mirror installation error angle calibration device according to claim 1, wherein the FP interference mirror (4) has a reflectivity of greater than 99% for 1550nm laser light;
6. the cold atom gravimeter raman mirror installation error angle calibration device according to claim 1, wherein a 1550nm laser (6) is connected to the port 1 of the circulator and used for detecting the transmission of laser;
7. the cold atom gravimeter raman mirror installation error angle calibration device according to claim 1, wherein a photoelectric detector (8) is connected to the port 3 of the circulator and used for receiving FP interference signals;
8. a cold atom gravimeter Raman reflector installation error angle calibration method includes specific steps
Step 1: the interference signal received by the photodetector 8 is output as
Wherein E 1 For reflected signals at the end face of 1550nm single-mode optical fibre 9, E 2 A signal E passing through the photodetector 8 is a reflected signal of the FP interference reflector, λ =1550nm, z is the distance between the end face of the 1550nm single-mode optical fiber 9 and the FP interference reflector 3 2 The change can be used for calculating the distance change between the end surface of the 1550nm single-mode optical fiber 9 and the FP interference reflector 3;
step 2: taking the FP interference probe 3-1 as the origin, the reference coordinates of the three are (0,0,0), (a, 0,0), (acos 60 °, asin60 °, 0), and the normal vector of the reference plane is n 0 ＝[0,0,asin60°]；
And step 3: after the cold atom gravimeter is carried or dynamically tested, the position of a Raman reflector in the cold atom gravimeter changes, and the coordinate of the interference probe 3-1 is converted into (x) 1 ,y 1 ,z 1 ) Coordinate transformation of the interference probe 3-2 into (x) 2 ,y 2 ,z 2 ) Coordinate transformation of the interference probe 3-3 into (x) 3 ,y 3 ,z 3 ) Wherein z is 1 ,z 2 ,z 3 Respectively obtained by step 1, x 1 ,y 1 ,x 2 ,y 2 Obtained by solving the following equation:
and 4, step 4: three interferometric probe coordinates (x) obtained by step 1 and step 3 1 ,y 1 ,z 1 )，(x 2 ,y 2 ,z 2 ) And (x) 3 ,y 3 ,z 3 ) And real-time computing the normal vector of the dynamic plane as
Wherein
Step 5, the normal vector of the reference plane obtained in the step 2 is n 0 ＝[0,0,asin60°]And step four dynamic plane normal vectors are
Calculating the vertical deviation angle between the dynamic plane and the reference plane
Step 6: calculating the output phase delta phi of the cold atom gravimeter according to the vertical deviation angle theta obtained in the step 5:
ΔΦ＝k eff gT 2 (1-θ 2 )
further obtaining the measurement deviation value delta g of the cold atom gravimeter caused by the installation deviation of the Raman reflector
Δg＝-θ 2 g
In the actual measurement process, the gravity measurement deviation value needs to be compensated into the output of the cold atom gravimeter.
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