CN105823789B - A kind of electron paramagnetic resonance probe and detection method - Google Patents
A kind of electron paramagnetic resonance probe and detection method Download PDFInfo
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- CN105823789B CN105823789B CN201610260238.7A CN201610260238A CN105823789B CN 105823789 B CN105823789 B CN 105823789B CN 201610260238 A CN201610260238 A CN 201610260238A CN 105823789 B CN105823789 B CN 105823789B
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Abstract
The invention discloses a kind of electron paramagnetic resonance probe and detection method, electron paramagnetic resonance probe includes co-planar waveguide and fluid channel.Wherein co-planar waveguide includes：High frequency sheet material, the high frequency sheet material has the upper surface and lower surface being oppositely arranged；It is arranged on the central metal band of the upper surface；The upper surface is arranged on, and positioned at grounded metal band of the central metal with both sides；There is gap between the grounded metal band and the central metal band；Wherein, the two ends of the width of the central metal band from the central metal band become narrow gradually to centre；The width in the gap is become narrow gradually from the two ends in the gap to centre.The co-planar waveguide is narrowed to center metal tape and gap width to improve transformation efficiency, and the narrowed mode for using gradual change can improve the bandwidth of electron paramagnetic resonance probe simultaneously to reduce the reflection of microwave.Fluid channel can also be further set, the electron paramagnetic resonance signal for detecting fluid sample.
Description
Technical field
The present invention relates to magnetic resonance arts, in particular, it is related to a kind of electron paramagnetic resonance probe and detects
Method.
Background technology
Electron paramagnetic resonance be it is a kind of be used for study the material containing unpaired electron spectroscopy means, due to can accurately and
And without the information on the Nomenclature Composition and Structure of Complexes for devastatingly obtaining material, it is widely used in physics, chemistry, material, biology etc.
Multiple fields.Electron spin is in additional magnetostatic field, and Zeeman splitting can occur for its energy level, when application meets the friendship of resonance condition
During varying magnetic field, electron spin can absorb magnetic field energy, while transition occurs for energy level, it is possible thereby to observe that electron paramagnetic resonance is believed
Number.General, electron paramagnetic resonance detection is carried out by electron paramagnetic resonance spectrometer.Electron paramagnetic resonance probe is electron paramagnetic
The important component of resonance spectrometer, it can change into the energy of microwave signal in alternating magnetic field, and act on electron spin, and will
The sensitive detection of electron paramagnetic resonance signal.
The transformation efficiency of electron paramagnetic resonance probe is to influence the important parameter of electron paramagnetic resonance spectrometer sensitivity.Conversion
Efficiency is higher, and the alternating magnetic field produced under unit power is stronger, and the sensitivity of electron paramagnetic resonance spectrometer is higher.Traditional electronics
Paramagnetic resonance probe is resonator, and it improves transformation efficiency by improving quality factor so as to improve the sensitivity of spectrometer, but
It is the resonator narrow bandwidth of high-quality-factor, it is impossible to which the electron paramagnetic resonance applied to broadband is detected.
Traditional electron paramagnetic resonance probe is resonator, and it to cavity wall by being processed by shot blasting and plating high conductance
The material (such as golden) of rate improves quality factor, and the raising of quality factor can bring the raising of spectrometer sensitivity.Due to resonance
Chamber improves sensitivity by improving quality factor, and quality factor is inversely proportional with bandwidth, and improving quality factor causes resonator
Bandwidth it is small, it is impossible to realize broadband electron paramagnetic resonance detection.
The content of the invention
To solve the above problems, the invention provides a kind of electron paramagnetic resonance probe and detection method, by with
The electron paramagnetic resonance probe of co-planar waveguide carries out electron paramagnetic resonance detection, by slowly being received to center metal tape and gap
Narrow design, improves the bandwidth and conversion efficiency of electron paramagnetic resonance probe.
To achieve these goals, the present invention provides following technical scheme：
A kind of electron paramagnetic resonance probe, the electron paramagnetic resonance probe includes：Co-planar waveguide, the co-planar waveguide is used
In the electron paramagnetic resonance signal of detection sample；
The co-planar waveguide includes：
High frequency sheet material, the high frequency sheet material has the upper surface and lower surface being oppositely arranged；
It is arranged on the central metal band of the upper surface；
The upper surface is arranged on, and positioned at grounded metal band of the central metal with both sides；The grounded metal band
There is gap between the central metal band；
Wherein, the two ends of the width of the central metal band from the central metal band become narrow gradually to centre；The seam
The width of gap is become narrow gradually from the two ends in the gap to centre.
It is preferred that, in above-mentioned electron paramagnetic resonance probe, the resistivity of the central metal band is less than 10-7Ω·m。
It is preferred that, in above-mentioned electron paramagnetic resonance probe, the value of the dielectric loss angle tangent of the high frequency sheet material is small
In 0.01.
It is preferred that, in above-mentioned electron paramagnetic resonance probe, the width at the two ends of the central metal band is 1mm, middle
Width be 100 μm.
It is preferred that, in above-mentioned electron paramagnetic resonance probe, the width at the two ends in the gap is 150 μm, middle width
Spend for 100 μm.
It is preferred that, in above-mentioned electron paramagnetic resonance probe, also include：It is arranged on the central metal band of the co-planar waveguide
And the fluid channel of the grounded metal belt surface of the co-planar waveguide；The fluid channel includes：Fluid sample passage.
Wherein, the fluid sample passage parallel to the high frequency sheet material upper surface, and perpendicular to the central metal
The bearing of trend of band；On the direction perpendicular to the upper surface, projection of the fluid sample passage in the upper surface is hung down
Directly divide projection of the central metal band in the upper surface equally.
It is preferred that, in above-mentioned electron paramagnetic resonance probe, also include：It is arranged on the reinforcing sheet material of the lower surface.
Present invention also offers a kind of detection method, the fluid sample detection method includes：It is common using above-mentioned electron paramagnetic
The probe that shakes detects the electron paramagnetic resonance signal of sample.
By foregoing description, the electron paramagnetic resonance probe that technical solution of the present invention is provided includes：Co-planar waveguide, institute
State the electron paramagnetic resonance signal that co-planar waveguide is used to detect sample；The co-planar waveguide includes：High frequency sheet material, the high frequency plate
Material has the upper surface and lower surface being oppositely arranged；It is arranged on the central metal band of the upper surface；It is arranged on the upper table
Face, and positioned at grounded metal band of the central metal with both sides；Have between the grounded metal band and the central metal band
There is gap；Wherein, the two ends of the width of the central metal band from the central metal band become narrow gradually to centre；The gap
Width become narrow gradually from the two ends in the gap to centre.The co-planar waveguide is received to center metal tape and gap width
It is narrow and to narrow to improve transformation efficiency and use the mode of gradual change to reduce the reflection of microwave, electron paramagnetic can be improved simultaneously
The bandwidth of resonance probe.Meanwhile, the electron paramagnetic resonance probe can also further set fluid channel, for detecting liquid-like
The electron paramagnetic resonance signal of product.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of structural representation of electron paramagnetic resonance probe provided in an embodiment of the present invention；
Fig. 2 is a kind of structural representation of co-planar waveguide provided in an embodiment of the present invention；
Fig. 3 is the sectional drawing of co-planar waveguide shown in Fig. 2；
Fig. 4 is a kind of structural representation of fluid channel provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As stated in the Background Art, traditional electron paramagnetic resonance probe is resonator, and it is by being polished place to cavity wall
Manage and plate the material (such as golden) of high conductivity to improve quality factor, the raising of quality factor can bring spectrometer sensitivity
Raising.Because resonator improves sensitivity by improving quality factor, and quality factor is inversely proportional with bandwidth, improves quality
The factor causes the bandwidth of resonator small, it is impossible to realize the electron paramagnetic resonance detection in broadband.
In order to which the electron paramagnetic resonance for realizing broadband is detected, the high bandwidth electronics that people have devised a variety of different structures is suitable
Magnetic resonance probe, for example：Electron paramagnetic resonance probe based on coplanar waveguide structure.The electronics based on co-planar waveguide is suitable at this stage
In magnetic resonance probe, the central metal bandwidth and gap width of co-planar waveguide remain constant on microwave transmission path,
Using sapphire as base material, gold and copper be processed as conductor material.Broadband (0.1- is realized using the probe
Electron paramagnetic resonance detection 67GHz).
Inventor's research is found, in above-mentioned electron paramagnetic resonance probe, the central metal bandwidth of co-planar waveguide and gap
Width remains constant on microwave transmission path, causes the current density of the detecting head surface relatively low, so transformation efficiency is not
It is high.And the electron paramagnetic resonance sonde configuration is relatively easy, fluid sample can only take the upper surface that drops in co-planar waveguide
Mode is loaded, and it is difficult the region concentrated in alternating magnetic field to cause fluid sample.
In order to solve the above problems, the embodiments of the invention provide a kind of electron paramagnetic resonance probe, the electron paramagnetic
Resonance probe includes：Co-planar waveguide, the co-planar waveguide is used for the electron paramagnetic resonance signal for detecting sample；
The co-planar waveguide includes：
High frequency sheet material, the high frequency sheet material has the upper surface and lower surface being oppositely arranged；
It is arranged on the central metal band of the upper surface；
The upper surface is arranged on, and positioned at grounded metal band of the central metal with both sides；The grounded metal band
There is gap between the central metal band；
Wherein, the two ends of the width of the central metal band from the central metal band become narrow gradually to centre；The seam
The width of gap is become narrow gradually from the two ends in the gap to centre.
The co-planar waveguide that electron paramagnetic resonance described in the embodiment of the present invention is popped one's head in is carried out to center metal tape and gap width
Narrow to improve transformation efficiency, and the narrowed mode for using gradual change can improve electronics simultaneously suitable to reduce the reflection of microwave
The bandwidth of magnetic resonance probe.Meanwhile, the electron paramagnetic resonance probe can also further set fluid channel, for detecting liquid
The electron paramagnetic resonance signal of sample.
In order that technical scheme provided in an embodiment of the present invention is clearer, such scheme is carried out below in conjunction with the accompanying drawings detailed
Thin description.
With reference to Fig. 1, Fig. 1 is a kind of structural representation of electron paramagnetic resonance probe provided in an embodiment of the present invention, described
Electron paramagnetic resonance probe includes：Co-planar waveguide 1.Electron paramagnetic resonance probe passes through coplanar ripple based on co-planar waveguide design
The electron paramagnetic resonance signal of detection sample is led, the characteristic of co-planar waveguide high bandwidth can be utilized, electron paramagnetic resonance is improved and visits
The bandwidth of head.The structure of the co-planar waveguide 1 is as shown in FIG. 2 and 3.
Referring to figs. 2 and 3 Fig. 2 is a kind of structural representation of co-planar waveguide provided in an embodiment of the present invention, and Fig. 3 is Fig. 2
The sectional drawing of shown co-planar waveguide.
The co-planar waveguide is popped one's head in for electron paramagnetic resonance, and the co-planar waveguide includes：High frequency sheet material 1b, the high frequency sheet material
1b has the upper surface and lower surface being oppositely arranged；It is arranged on the central metal band 1c of the upper surface；It is arranged on described
Surface, and positioned at grounded metal band 1d of the central metal with 1c both sides；The grounded metal band 1d and the central metal
There is gap 1e between band 1c.
Wherein, the two ends of width of the central metal with 1c from the central metal band become narrow gradually to centre；It is described
The width in gap is become narrow gradually from the two ends in the gap to centre.
The resistivity of the central metal band is less than 10-7Ω·m.Optionally, material of the central metal with 1c can be with
For gold or silver or the metal material such as copper or aluminium.The grounded metal band 1d and central metal band 1c is using same layer gold
Prepared by category, in order to simplify preparation technology, improve production efficiency.In other embodiments, grounded metal band 1d and the institute
Stating central metal can also be prepared with 1c using different metal materials.
The value of the dielectric loss angle tangent of the high frequency sheet material 1b is less than 0.01.The high frequency sheet material exists for transmission frequency
The circuit boards of more than 1GHz electromagnetic waves.Optionally, the high frequency sheet material is RO4350B based plates.
In co-planar waveguide described in the embodiment of the present invention, the central metal width W with 1c and the gap 1e width S
The structure narrowed using gradual change.Width W of the central metal with 1c from two ends of the central metal with 1c to it is middle gradually
Narrow；The width S of the gap 1e is become narrow gradually from the two ends of the gap 1e to centre.The co-planar waveguide is by narrowing institute
The width S for stating central metal the width W with 1c and the gap 1e improves conversion efficiency, narrows and combines by using gradual change and be high
The design of frequency sheet material retains the characteristic of co-planar waveguide high bandwidth.
Specifically, the width at two ends of the central metal with 1c is 1mm, middle width is 100 μm.The gap
The width at two ends is 150 μm, and middle width is 100 μm.Width of the central metal with 1c and the gap 1e has
Two ends uniformly become narrow gradually to centre.
As shown in Figures 2 and 3, co-planar waveguide described in the embodiment of the present invention also includes：It is arranged on the reinforcing of the lower surface
Sheet material 1a.
In the present invention, co-planar waveguide is on the one hand by narrowing the central metal width W with 1c and the gap 1e
Width S improves the current density of co-planar waveguide upper surface center position, so as to improve transformation efficiency；On the other hand use
The mode of gradual change narrows the central metal width W with 1c and gap 1e width S so that impedance is slowly varying, from
And microwave reflection is reduced, be conducive to improving bandwidth.Because lossy microwave is divided into conductor losses and dielectric loss, the coplanar ripple
The metal making central metal band 1c and grounded metal band 1d for employing low-resistivity in the design are led, so as to reduce
The conductor losses of co-planar waveguide.Meanwhile, the co-planar waveguide uses the high frequency sheet material 1b with low-dielectric loss angle tangent to make
For the substrate of co-planar waveguide, and then reduce the dielectric loss of co-planar waveguide.
In summary, co-planar waveguide described in the embodiment of the present invention is by narrowing width W and gap 1e of the central metal with 1c
Width S, realize the purpose for improving transformation efficiency, and take constriction the mode of uniform gradual change to reduce microwave reflection,
Meanwhile, co-planar waveguide reduces lossy microwave using low-loss conductor and dielectric material, and high bandwidth is realized by above-mentioned means
Microwave transmission.Therefore, the co-planar waveguide has the characteristic of high transformation efficiency and high bandwidth simultaneously.
Optionally, the electron paramagnetic resonance signal of fluid sample can be detected for the ease of electron paramagnetic resonance probe, such as
Shown in Fig. 1, the electron paramagnetic resonance probe also includes：Fluid channel 2.The fluid channel 2 is arranged in the co-planar waveguide 1
The surface of the grounded metal band of heart metal tape and the co-planar waveguide 1.The fluid channel includes：Fluid sample passage 2c.
Wherein, the fluid sample passage 2c parallel to the high frequency sheet material 1b upper surface, and perpendicular to the center
The bearing of trend of metal tape；On the direction perpendicular to the upper surface, the fluid sample passage 2c is in the upper surface
Projection of the central metal band in the upper surface is vertically divided in projection equally.Specifically, structure such as Fig. 4 institutes of the fluid channel 2
Show.
With reference to Fig. 4, Fig. 4 is a kind of structural representation of fluid channel provided in an embodiment of the present invention, and the fluid channel includes：Base
Bottom 2a, the fluid sample import 2b through the substrate 2a and the fluid sample outlet 2d through the substrate 2a；It is arranged on
Fluid sample passage 2c in the substrate 2a.Wherein, described fluid sample passage 2c one end and the fluid sample import 2b
Connection, the other end is connected with fluid sample outlet 2d.
Electron paramagnetic resonance probe can detect the electronics of fluid sample by setting fluid channel described in the embodiment of the present invention
Paramagnetic Resonance Singnal.Fluid sample load when, fluid sample in fluid channel 2 flow through order it is as follows：Fluid sample is first by liquid
Body sample inlet 2b) flow into, fluid sample passage 2c is passed through, finally by fluid sample outlet 2d outflows.The present invention is implemented
In the example electron paramagnetic resonance probe, fluid sample import 2b quantity and fluid sample outlet 2d quantity can be according to survey
Examination requires unrestricted choice, it is not limited to the embodiment shown in Fig. 2 and Fig. 4.
In electron paramagnetic resonance probe described in the embodiment of the present invention, fluid channel 2 is by co-planar waveguide 1 is as wall and passes through
Thermal bonding technique realizes being seamless bonding between the two, so as to prevent the leakage of fluid sample.And fluid sample passage
2c have passed through the central area of the upper surface of co-planar waveguide 1, the characteristics of region as described above has high transformation efficiency, work as liquid-like
Alternating magnetic field will fully act on fluid sample when product flow through fluid sample passage 2c.
In electron paramagnetic resonance probe described in the embodiment of the present invention, co-planar waveguide 1 one functions as transmission line to pass
Defeated microwave, another effect is to improve transformation efficiency, and the region of high transformation efficiency is located at the center of co-planar waveguide upper surface,
Fluid channel 2 is arranged on the upper surface of co-planar waveguide 1 by the present invention, and its fluid sample passage 2c passes through the height of co-planar waveguide 1
The region of transformation efficiency, so that alternating magnetic field fully acts on fluid sample.In addition fluid channel 2 by the use of co-planar waveguide 1 as
Its fluid sample passage 2c wall, and both be seamless bonding is realized using thermal bonding technique, so as to prevent liquid
Leakage.
By foregoing description, electron paramagnetic resonance probe is simultaneous based on co-planar waveguide design described in the embodiment of the present invention
Have high bandwidth and the characteristic of high transformation efficiency.Meanwhile, high broadband, high sensitivity can be carried out to fluid sample by microchannel structural design
Electron paramagnetic resonance detection.
Electron paramagnetic resonance probe includes two parts described in the embodiment of the present invention：Co-planar waveguide is designed and fluid channel is set
Meter.In the electron paramagnetic resonance probe, the effect of co-planar waveguide：One is to provide the microwave transmission function of high bandwidth, and two be office
Portion narrows to improve current density, improves magnetic field transformation efficiency.The effect of fluid channel is the flow direction for controlling fluid sample, makes liquid
Region of the sample through too high transformation efficiency, so that alternating magnetic field fully acts on fluid sample.
The present invention devises the electron paramagnetic resonance probe of a kind of high bandwidth and high transformation efficiency based on co-planar waveguide, described
Electron paramagnetic resonance probe can be applied in various fields such as chemistry, biologies.
By foregoing description, the electron paramagnetic resonance probe has the advantages that high bandwidth and high transformation efficiency.
Co-planar waveguide reduces lossy microwave, and centering using the conductor of low-resistivity and the dielectric material of low-dielectric loss angle tangent
Heart metal bandwidth and gap width take the narrowed mode of gradual change to reduce microwave reflection.By reducing lossy microwave and reflection
The electron paramagnetic resonance probe of high bandwidth can be achieved.Co-planar waveguide is improved by narrowing central metal bandwidth and gap width
The transformation efficiency in centre of surface region, and the fluid channel fluid sample passage for controlling fluid sample to flow to passes through this area thereon
Domain, when liquid travels from liquid sample channel, alternating magnetic field will fully act on fluid sample.
In electron paramagnetic resonance probe described in the embodiment of the present invention, the central metal band at such as design co-planar waveguide two ends
Width W is that the width S in the gap at 1mm, two ends is 150um, and the width W of the central metal band of center is 150um, center
Gap width S be 100um, from Rogers companies RO4350B based plates be used as co-planar waveguide high frequency sheet material, select
Copper, from base material of the PMMA materials as fluid channel, can make it that electron paramagnetic resonance is popped one's head in as the material of metal tape
Bandwidth reach 18GHz, transformation efficiency reaches 15Gauss/ √ W.
When implementing co-planar waveguide described in the embodiment of the present invention, can also use other models has low-dielectric loss angle
The high frequency sheet material such as Rogers of tangent 58 series and Taconic TLY series, can reach identical purpose.
When implementing fluid channel described in the embodiment of the present invention, other organic materials such as PDMS can also be used as miniflow
The base material in road, as long as material therefor is easy to be bonded with co-planar waveguide and do not reacted with sample, can reach identical purpose.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (8)
1. a kind of electron paramagnetic resonance probe, it is characterised in that the electron paramagnetic resonance probe includes：Co-planar waveguide, it is described
Co-planar waveguide is used for the electron paramagnetic resonance signal for detecting sample；
The co-planar waveguide includes：
High frequency sheet material, the high frequency sheet material has the upper surface and lower surface being oppositely arranged；
It is arranged on the central metal band of the upper surface；
The upper surface is arranged on, and positioned at grounded metal band of the central metal with both sides；The grounded metal band and institute
Stating has gap between central metal band；
Wherein, the two ends of the width of the central metal band from the central metal band become narrow gradually to centre；The gap
Width is become narrow gradually from the two ends in the gap to centre.
2. electron paramagnetic resonance probe according to claim 1, it is characterised in that the resistivity of the central metal band is small
In 10-7Ω·m。
3. electron paramagnetic resonance probe according to claim 1, it is characterised in that the dielectric loss angle of the high frequency sheet material
The value of tangent is less than 0.01.
4. electron paramagnetic resonance probe according to claim 1, it is characterised in that the width at the two ends of the central metal band
Spend for 1mm, middle width is 100 μm.
5. electron paramagnetic resonance according to claim 1 probe, it is characterised in that the width at the two ends in the gap is
150 μm, middle width is 100 μm.
6. electron paramagnetic resonance probe according to claim 1, it is characterised in that also include：It is arranged on the coplanar ripple
The central metal band and the fluid channel of the grounded metal belt surface of the co-planar waveguide led；The fluid channel includes：Liquid-like
Product passage；
Wherein, the fluid sample passage parallel to the high frequency sheet material upper surface, and perpendicular to the central metal band
Bearing of trend；On the direction perpendicular to the upper surface, projection of the fluid sample passage in the upper surface is vertically put down
Divide the central metal band in the projection of the upper surface.
7. the electron paramagnetic resonance probe according to claim any one of 1-6, it is characterised in that also include：It is arranged on institute
State the reinforcing sheet material of lower surface.
8. a kind of detection method, it is characterised in that the detection method includes：Using the electricity as described in claim any one of 1-7
The electron paramagnetic resonance signal of sub- paramagnetic resonance probe detection sample.
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