CN110441124A - Laser heating device and heating means for atomic spin measurement of magnetic field - Google Patents
Laser heating device and heating means for atomic spin measurement of magnetic field Download PDFInfo
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- CN110441124A CN110441124A CN201910671810.2A CN201910671810A CN110441124A CN 110441124 A CN110441124 A CN 110441124A CN 201910671810 A CN201910671810 A CN 201910671810A CN 110441124 A CN110441124 A CN 110441124A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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Abstract
The invention discloses a kind of laser heating devices for atomic spin measurement of magnetic field, including exocoel, inner cavity chamber, heat absorbing sheet and heating laser;Inner cavity chamber is for injecting under test gas;Inner cavity chamber is placed in the inside of exocoel, vacuum layer is formed between exocoel and inner cavity chamber, heat absorbing sheet fitting is installed in the cavity wall of inner cavity chamber, and heating laser is located at outside exocoel, for irradiating heat absorbing sheet to convert light energy into thermal energy, the under test gas in inner cavity chamber is heated.The invention also discloses a kind of heating means of laser heating device based on atomic spin measurement of magnetic field as above, heating laser emits laser to heat absorbing sheet, and heat absorbing sheet converts light energy into thermal energy;The cavity wall through inner cavity chamber is transferred to internal under test gas to the thermal energy of heat absorbing sheet in thermo-conducting manner, and wherein vacuum layer is for keeping the temperature inner cavity chamber.The device of the invention and method all have the advantages that heating speed is fast, measuring accuracy is high.
Description
Technical field
The invention mainly relates to atomic spin measurement of magnetic field technical field, refer in particular to a kind of for atomic spin measurement of magnetic field
Laser heating device and heating means.
Background technique
When using the environmental magnetic field of alkali metal atom spin test atom, alkali metal atom can be around magnetic field to spinning
The size of precession, magnetic field is related to Spin precession, needs for alkali metal atom to be heated to specific temperature in the process.It is existing
Gas heating means, mainly to encapsulation air chamber carry out thermal resistance contact heating or by hot gas heat transfer heating
The method of gas chamber is heated, and then carries out temperature test by thermocouple.Thermal resistance mode, which heats, itself adds conducting wire that can produce
Raw certain magnetic field, and the power that the method for hot gas heat transfer needs consumption very big, the use of unsuitable miniature instrument, while by
In measuring using thermocouple to temperature, and certain magnetic field can be generated, so such method can make the test of low-intensity magnetic field
At bigger interference, it in order to reduce interference, and will increase the complexity of system, increase systematic error, influence the standard of test
True property.In addition the method for thermal current heating needs first to heating air-flow heating, this needs biggish power in the process, is not suitable for
The field of employment of miniature instrument increases system overall complexity.
Summary of the invention
The technical problem to be solved in the present invention is that, for technical problem of the existing technology, the present invention provides one
The kind laser heating device and heating means for atomic spin measurement of magnetic field that heating speed is fast, measuring accuracy is high.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of laser heating device for atomic spin measurement of magnetic field, including exocoel, inner cavity chamber, heat absorbing sheet and heating
Laser;The inner cavity chamber is for injecting under test gas;The inner cavity chamber is placed in the inside of the exocoel, the exocoel with it is interior
Vacuum layer is formed between chamber, the heat absorbing sheet fitting is installed in the cavity wall of the inner cavity chamber, and the heating laser is located at institute
It states outside exocoel, for irradiating the heat absorbing sheet to convert light energy into thermal energy, the under test gas in inner cavity chamber is added
Heat.
As a further improvement of the above technical scheme:
The heat absorbing sheet is heat absorption silicon wafer.
It is provided with interlayer in the inner cavity chamber, is formed between the interlayer and the cavity wall of inner cavity chamber for accommodating the heat absorption
The cavity of silicon wafer, the heat absorption wafer chuck are set in the cavity.
The cavity is connected with the inner space of the exocoel.
The interlayer is quartz plate.
It further include the temperature sensing assembly for detecting under test gas temperature in the inner cavity chamber, the temperature sensing assembly
It is connected with the heating laser, for adjusting heating laser power to form closed-loop control.
The temperature sensing assembly includes detection laser, photodetector and processor, the detection laser, photodetection
Device and processor are respectively positioned on the outside of the exocoel, and the detection laser is used to emit laser, the light to the inner cavity chamber
Electric explorer is sent to processor for receiving the laser by inner cavity chamber and being converted to electric signal, and the processor is used for
Electric signal is handled to obtain temperature signal.
The heating laser and the laser of detection Laser emission are mutually perpendicular to.
The invention also discloses a kind of heating of laser heating device based on atomic spin measurement of magnetic field as described above
Method,
For the heating laser transmitting laser to the heat absorbing sheet, the heat absorbing sheet converts light energy into thermal energy;
The cavity wall through inner cavity chamber is transferred to internal under test gas to the thermal energy of the heat absorbing sheet in thermo-conducting manner, wherein
Vacuum layer is for keeping the temperature inner cavity chamber.
As a further improvement of the above technical scheme:
The temperature of under test gas in inner cavity chamber is measured by the method at light path optical system for testing Faraday angle;
The temperature value of measurement is fed back into heating laser, the power of heating laser is adjusted, to keep under test gas
Temperature be in constant range.
Compared with the prior art, the advantages of the present invention are as follows:
(1) in such a way that heating laser is matched with heat absorbing sheet, realize the heating method of non-direct contact, avoid due to
Own system error caused by (such as modes such as thermal resistances) is contacted, the accuracy of test is improved;
(2) in such a way that heating laser is matched with heat absorbing sheet, itself will not generate magnetic field and influence original environment magnetic
Measurement, further increase test accuracy (and conventional thermal resistance mode, due to too close under test gas, generation
Magnetic field will affect the measurement of weak magnetic);
(3) in such a way that heating laser is matched with heat absorbing sheet, heating speed is fast;
(4) it does not need to be covered with thermal insulation material, so that entire test system for keeping the temperature inner cavity chamber using vacuum layer
It unites more succinct, reliability is higher, to also reduce the systematic error of whole system, another step improves test accuracy.
(5) the temperature scaling factor strategy used, can be improved heating accuracy, to improve measuring accuracy;
(6) by contactless temperature measurement method, itself is avoided as caused by contact (such as modes such as thermocouples)
Systematic error improves the accuracy of test;In addition temperature sensing assembly itself will not generate magnetic field and influence original environment magnetic
Measurement, further increase test accuracy (and conventional thermocouple mode, due to too close under test gas, generation
Magnetic field will affect the measurement of weak magnetic);
(7) above-mentioned temperature measurement method response is fast, and closed-loop control precision is high, and temperature is constant, improves measuring accuracy.
Detailed description of the invention
Fig. 1 is the schematic perspective view of the embodiment of the present invention.
Fig. 2 is the schematic diagram of the section structure of the embodiment of the present invention.
Fig. 3 is the structural schematic diagram of heat absorption silicon wafer and interlayer in the embodiment of the present invention.
Fig. 4 is the computer heating control block diagram in the embodiment of the present invention.
Figure label indicates: 1, exocoel;2, inner cavity chamber;3, heat absorbing sheet;4, heating laser;5, vacuum layer;6, interlayer;
601, cavity;7, temperature sensing assembly;701, laser is detected;702, photodetector;703, processor.
Specific embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
As depicted in figs. 1 and 2, the laser heating device for atomic spin measurement of magnetic field of the present embodiment, including exocoel
Room 1, inner cavity chamber 2, heat absorbing sheet 3 and heating laser 4;Inner cavity chamber 2 is for injecting under test gas (such as alkali metal atom rubidium, caesium);
Inner cavity chamber 2 is placed in the inside of exocoel 1, and vacuum layer 5 is formed between exocoel 1 and inner cavity chamber 2, and the fitting of heat absorbing sheet 3 is installed on interior
On the outer wall of chamber 2, heating laser 4 is located at outside exocoel 1, for irradiating heat absorbing sheet 3 to convert light energy into thermal energy, through interior
The cavity wall of chamber 2 heats internal under test gas.When testing, heating laser 4 emits laser to heat absorbing sheet 3,
Heat absorbing sheet 3 converts light energy into thermal energy, and cavity wall of the thermal energy of heat absorbing sheet 3 in thermo-conducting manner through inner cavity chamber 2 is transferred to inside
Under test gas, treat the heating of detection gas to realize;Wherein vacuum layer 5 is for keeping the temperature inner cavity chamber 2.
Laser heating device for atomic spin measurement of magnetic field of the invention, has the following technical effect that
In such a way that heating laser 4 is matched with heat absorbing sheet 3, realize the heating method of non-direct contact, avoid due to
Own system error caused by (such as modes such as thermal resistances) is contacted, the accuracy of subsequent measurement of magnetic field is improved;
In such a way that heating laser 4 is matched with heat absorbing sheet 3, itself will not generate magnetic field and influence original environmental magnetic field
Measurement, further increase test accuracy (and conventional thermal resistance mode, due to too close under test gas, the magnetic of generation
Field will affect the measurement of weak magnetic);
In such a way that heating laser 4 is matched with heat absorbing sheet 3, heating speed is fast;
Using vacuum layer 5 for keeping the temperature inner cavity chamber 2, do not need to be covered with thermal insulation material, so that entire test system
It unites more succinct, reliability is higher, to also reduce the systematic error of whole system, another step improves test accuracy.
As shown in figure 3, heat absorbing sheet 3 is heat absorption silicon wafer.Due in the manufacturing process of inner cavity chamber 2, can generate 1000 DEG C with
On high temperature, and silicon wafer is able to bear above-mentioned high temperature;Certainly, in other embodiments, heat absorbing sheet 3 also can choose other resistance to height
The material replacement that can be absorbed laser energy and be converted into thermal energy of temperature.Interlayer 6, interlayer 6 and inner cavity chamber are wherein provided in inner cavity chamber 2
The cavity 601 for accommodating heat absorption silicon wafer is formed between 2 cavity wall, heat absorption wafer chuck is set in cavity 601, will by interlayer 6
Heat absorption silicon wafer is fixed in cavity wall.In addition, cavity 601 is connected with the inner space of exocoel 1, guarantee vacuum in cavity 601
Degree is consistent with the vacuum degree of exocoel 1, and the heat absorption silicon wafer in cavity 601 is avoided to generate gas expansion after the heating and generate danger
Danger.Wherein the material of interlayer 6 is quartz glass, and entire exocoel 1 and inner cavity chamber 2 are all made of quartz glass and are made.Certainly, at it
In its embodiment, the fixation to heat absorbing sheet 3 can also be realized by other fixed forms.
It as shown in Figure 1 and Figure 4, further include being examined for detecting the temperature of under test gas temperature in inner cavity chamber 2 in the present embodiment
Component 7 is surveyed, temperature sensing assembly 7 is connected with heating laser 4, for adjusting 4 power of heating laser to form closed-loop control, thus
Guarantee that the temperature of gas to be detected is in constant range, improves the reliability of test.Wherein heat absorption silicon wafer is located at inner cavity chamber 2
Top side, heating laser 4 is then positioned at the top side of exocoel 1 and face heat absorption silicon wafer;Detect the week that laser 701 is then located at exocoel 1
Side, the laser that heating laser 4 emits with detection laser 701 is mutually perpendicular to, to avoid interfering with each other.
In the present embodiment, temperature sensing assembly 7 includes detection laser 701, photodetector 702 and processor 703, detection
Laser 701, photodetector 702 and processor 703 are respectively positioned on the outside of exocoel 1, and detection laser 701 is used for inner cavity chamber 2
Emitting laser, photodetector 702, which is used to receive the laser by inner cavity chamber 2 and is converted to electric signal, is sent to processor 703,
Processor 703 is used to carry out being converted to temperature signal to electric signal, then temperature signal is fed back at heating laser 4, thus
The laser power that heating laser 4 issues is adjusted, closed-loop control is formed.Specifically, the light path that detection laser 701 emits can be with
Faraday's angle of rotation optical path is selected, detection light passes through the double-deck chamber (exocoel 1 and inner cavity chamber 2), then by photodetection
Device 702 receives, and the signal received is handled by processor 703, according to the temperature that test obtains, controls in real time temperature, by temperature
The power for spending feed back control system control heating laser 4 increases or reduces, and realizes closed loop, last test to control temperature
As a result it is exported by processor 703.Light path can be laser and obtain temperature value by the test at Faraday angle after gas,
The temperature of gas can also be obtained by other gas test principle optical paths.Wherein Faraday angle measuring method belongs to routine
Detection method, specifically: it is it by the isotropic medium in magnetic field after laser becomes linearly polarized light by polarizer
The phenomenon that plane of polarization can rotate is the chamber filled with alkali metal gas, the rotation angle of plane of polarization and magnetic induction herein
Intensity is proportional in the direction of propagation of light, and magnetic field strength is related to alkali metal atom Spin precession, the frequency of Spin precession with
The temperature of gas atom is related, to measure gas temperature.
The temperature scaling factor strategy of above-mentioned use, can be improved heating accuracy, to improve follow-up test precision;Separately
Outside, by above-mentioned contactless temperature measurement method, the own system as caused by contact (such as modes such as thermocouples) is avoided
Error improves the accuracy of test;In addition temperature sensing assembly 7 itself will not generate magnetic field and influence original environmental magnetic field
Measurement, further increase test accuracy (and conventional thermocouple mode, due to too close under test gas, the magnetic field of generation
It will affect the measurement of weak magnetic);In addition, above-mentioned temperature measurement method response is fast, closed-loop control precision is high, and temperature is constant, improves
Measuring accuracy.
The present invention further correspondingly discloses a kind of laser heating device based on atomic spin measurement of magnetic field as described above
Heating means, specifically:
Heating laser 4 emits laser to heat absorbing sheet 3, and heat absorbing sheet 3 converts light energy into thermal energy;
Cavity wall of the thermal energy of heat absorbing sheet 3 in thermo-conducting manner through inner cavity chamber 2 is transferred to internal under test gas, wherein very
Dead level 5 is for keeping the temperature inner cavity chamber 2.
In the present embodiment, gas to be measured in inner cavity chamber 2 is measured by the method at light path optical system for testing Faraday angle
The temperature of body;
The temperature value of measurement is fed back into heating laser 4, the power of heating laser 4 is adjusted, to keep gas to be measured
The temperature of body is in constant range.Specific heating means and thermometry can refer to retouching in above-mentioned heating device
It states.
Heating means of the invention realize not only have based on the laser heating device of above-mentioned atomic spin measurement of magnetic field
Have the advantages of above-mentioned heating device, and it is easy to operate, be easily achieved.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (10)
1. a kind of laser heating device for atomic spin measurement of magnetic field, which is characterized in that including exocoel (1), inner cavity chamber
(2), heat absorbing sheet (3) and heating laser (4);The inner cavity chamber (2) is for injecting under test gas;The inner cavity chamber (2) is placed in institute
The inside of exocoel (1) is stated, forms vacuum layer (5) between the exocoel (1) and inner cavity chamber (2), heat absorbing sheet (3) fitting
It is installed in the cavity wall of the inner cavity chamber (2), the heating laser (4) is located at the exocoel (1) outside, described for irradiating
Heat absorbing sheet (3) heats the under test gas in inner cavity chamber (2) with converting light energy into thermal energy.
2. the laser heating device according to claim 1 for atomic spin measurement of magnetic field, which is characterized in that the suction
Backing (3) is heat absorption silicon wafer.
3. the laser heating device according to claim 2 for atomic spin measurement of magnetic field, which is characterized in that in described
It is provided on chamber (2) interlayer (6), is formed between the interlayer (6) and the cavity wall of inner cavity chamber (2) for accommodating the heat absorption silicon
The cavity (601) of piece, the heat absorption wafer chuck are set in the cavity (601).
4. the laser heating device according to claim 3 for atomic spin measurement of magnetic field, which is characterized in that the sky
Chamber (601) is connected with the inner space of the exocoel (1).
5. the laser heating device according to claim 3 for atomic spin measurement of magnetic field, which is characterized in that the folder
Layer (6) is quartz plate.
6. the laser heating device as claimed in any of claims 1 to 5 for atomic spin measurement of magnetic field, special
Sign is, further includes the temperature sensing assembly (7) for detecting the interior under test gas temperature of the inner cavity chamber (2), the temperature inspection
It surveys component (7) to be connected with the heating laser (4), for adjusting heating laser (4) power to form closed-loop control.
7. the laser heating device according to claim 6 for atomic spin measurement of magnetic field, which is characterized in that the temperature
Spending detection components (7) includes detection laser (701), photodetector (702) and processor (703), the detection laser
(701), photodetector (702) and processor (703) are respectively positioned on the outside of the exocoel (1), the detection laser (701)
For emitting laser to the inner cavity chamber (2), the photodetector (702) is used to receive the swashing by inner cavity chamber (2)
Light is simultaneously converted to electric signal and is sent to processor (703), and the processor (703) is for handling electric signal to obtain temperature
Signal.
8. the laser heating device according to claim 7 for atomic spin measurement of magnetic field, which is characterized in that described to add
Thermal laser (4) and the laser of detection laser (701) transmitting are mutually perpendicular to.
9. a kind of adding based on the laser heating device of atomic spin measurement of magnetic field described in any one of claim 1 to 8
Hot method, it is characterised in that:
For heating laser (4) the transmitting laser to the heat absorbing sheet (3), the heat absorbing sheet (3) converts light energy into thermal energy;
Cavity wall of the thermal energy of the heat absorbing sheet (3) in thermo-conducting manner through inner cavity chamber (2) is transferred to internal under test gas,
Middle vacuum layer (5) is for keeping the temperature inner cavity chamber (2).
10. heating means according to claim 9, which is characterized in that pass through light path optical system for testing Faraday
The temperature of under test gas in method measurement inner cavity chamber (2) at angle;
The temperature value of measurement is fed back into heating laser (4), the power of heating laser (4) is adjusted, to keep gas to be measured
The temperature of body is in constant range.
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