CN205038160U - Surface plasma resonance absorption detector - Google Patents
Surface plasma resonance absorption detector Download PDFInfo
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- CN205038160U CN205038160U CN201520809845.5U CN201520809845U CN205038160U CN 205038160 U CN205038160 U CN 205038160U CN 201520809845 U CN201520809845 U CN 201520809845U CN 205038160 U CN205038160 U CN 205038160U
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- light source
- angle
- convex lens
- absorption detector
- swivel arm
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Abstract
The utility model discloses a surface plasma resonance absorption detector, including the rotor arm, light source, rectangular prism, your metal layer substrate, convex lens, photoelectric detector or optical fiber access type spectrum appearance, on the rotor arm was arranged in to light source, convex lens and photoelectric detector or optical fiber access nature spectrum appearance, on photoelectric detector was in the focus of convex lens, the light source optical axis passed through the pivot axle center of rotor arm, rectangular prism's edged surface always passes through the pivot axle center of rotor arm, and a right angle face plates metallic reflective coating, and your metal layer substrate another right angle face places. The application provides a surface plasma resonance absorption detector has overcome the shortcoming of theta - the 2 theta rotation form of plasma resonance angle scanning detection, through the scanning mode that founds a single rotor arm, compares traditional mode, and scanning speed is faster, and mechanical structure is simply stable, and more importantly can turn into spectrum demodulation mode very easily, and the optics debugging is quick simple.
Description
Technical field
The utility model belongs to optical field, is specifically related to a kind of multi-functional plasma resonance test experience device with mechanical-optical setup.
Background technology
Surface plasmon absorption detects as a kind of novel detection technique at biology, medical treatment, food, chemical industry, environmental index detection field plays an increasingly important role, current surface plasma pick-up unit is based on prism-coupled, detection mode has angle solution mediation spectrum demodulation two kinds of modes, when adopting angle demodulation, the swivel arm mechanism that general needs two are coaxial, an arm is that light in source arm rotates θ angle, another one arm is that detection arm rotates 2 θ, light source is generally the good LASER Light Source of monochromaticity, make collimated light by entering into the receiver in detection arm after the total reflection of prism sensitive face, the reflection strength change under different incidence angles degree is obtained by angle scanning-light-intensity test, both be angle demodulation mode, under angle demodulation mode, there is the angular absorption peak value that one or more (guided wave type) matches with sample refractive index on sensing surface, be called resonance absorption angle.When adopting spectrum demodulation mode, fix an incident angle of light, light source adopts wide spectrum light source, is generally tungsten lamp or wide range SLED, has a wavelength absorption peak matched with sample refractive index, be commonly referred to as resonant wavelength in the absorption spectrum received.The level of sensitivity of two kinds of metering systems is similar, because need the reason of spectrometer, cost polishing wax demodulation mode wants high, but there is the reason of two swivel arms in angle scanning apparatus, rotational angle exist 2 times poor, automatic scanning function be realized, there is complicated in mechanical structure, unsuitable miniaturization, the shortcomings such as sweep velocity is slow.Other two kinds of demodulation modes are also not easily synthesized on a kind of device.
Utility model content
For prior art Problems existing, be the shortcoming overcoming θ-2 θ rotation formula that plasma resonance angle scanning detects, the application builds a kind of scan mode of single swivel arm, compare traditional approach, sweep velocity is faster, physical construction simple and stable, the more important thing is and can be easy to be converted into spectrum demodulation mode, and optics debugging is simple fast.Concrete technical scheme is as follows.
The application provides a kind of surface plasmon absorption detector, and it comprises swivel arm, light source, right-angle prism, precious metal film layer substrate, convex lens, photodetector or optical fiber access spectrometer, described light source, convex lens and photodetector or intelligent acess spectrometer are placed on swivel arm, photodetector is in the focus of convex lens, light source optical axis, by the rotating shaft core of swivel arm, ensures that in swivel arm rotation process, light is irradiated to the substrate sensitive face be on axle center all the time, a right-angle surface plating reflectance coating of described right-angle prism, another right-angle surface places precious metal film layer substrate, and the right-angle surface of right-angle prism plating reflectance coating is in the rotating shaft core of swivel arm, thus ensure in swivel arm rotation process, on sensitive face, facula position does not produce movement, the incident light of light source is incident from inclined-plane, according to right angle principle of reflection, no matter how incident angle changes, the light incided in right-angle surface all can reflect and be parallel to incident light and return in the right-angle surface of another plated film, along with the difference of angle, translation is produced relative to incident light by the back light of prism, by increasing convex lens in return light path, back light deviation is pooled to lens focus, focus places photodetector, according to the cumulative rule of lens, laser diverse location on convex lens of firm power is incident in parallel optical axis mode, the energy that focus is collected is almost constant, the receiving plane of photodetector is in the focus of convex lens, and it is vertical with optical axis, although the translation due to Returning beam causes the incident angle on photodetector target surface to change, detector received energy value can be caused to change, but this change is slow and regular, and can revise.
Preferably, the emission of light of light source described in the application is through swivel arm rotating shaft core.
Preferably, right-angle prism described in the application is placed on an adjustment rack, and the substrate solving different-thickness causes the translation problem of sensitive face, and preferably, the right angle length of side of right-angle prism is 20-50mm.
Preferably, right-angle prism described in the application and precious metal film layer substrate are same glass material, as K9 glass.
Preferably, described in the application, lens axis is parallel with light source optical axis, and photodetector target surface is vertical with lens axis.
Preferably, swivel arm described in the application is driven by a precise rotation platform.
The spectrometer of optical fiber access described in the application comprises optical fiber, rotating disk, the joints of optical fibre and spectrometer; Described rotating disk, centered by the focus of convex lens, the joints of optical fibre is placed by rotating disk, the optical axis of the joints of optical fibre and the optical axis isoplanar of convex lens; Described optical fiber one end is connected with connector, and the other end is connected with spectrometer.
Preferably, described in the application, detector also comprises polaroid, is placed between light source and right-angle prism.
Beneficial effect: the surface plasmon absorption detector that the application provides overcomes can the shortcoming of θ-2 θ rotation formula that detects of plasma resonance angle scanning, by building a kind of scan mode of single swivel arm, compare traditional approach, sweep velocity is faster, physical construction simple and stable, the more important thing is and can be easy to be converted into spectrum demodulation mode, optics debugging is simple fast.
Accompanying drawing explanation
The structural representation of Fig. 1 the application surface plasmon absorption detector;
In figure: 1-light source, 2-right-angle prism, 3-convex lens, 4-photodetector, 5-precious metal film layer substrate, 6-sample cell, 7-polaroid.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing, explanation is further explained to the utility model.
As shown in Figure 1, be the structural representation of the surface plasmon absorption detector that the application provides, it comprises swivel arm, light source 1, right-angle prism 2, precious metal film layer substrate 5, convex lens 3, photodetector 4 or optical fiber access spectrometer, described light source 1, convex lens 3 and photodetector 4 or intelligent acess spectrometer are placed on swivel arm, photodetector 4 is in the focus of convex lens 3, light source optical axis is by the rotating shaft core of swivel arm, ensure that in swivel arm rotation process, light is irradiated to substrate 5 sensitive face be on axle center all the time, a right-angle surface of described right-angle prism 2 and the right-angle surface of plating reflectance coating are in the rotating shaft core of swivel arm, thus ensure in swivel arm rotation process, on sensitive face, facula position does not produce movement, a right-angle surface plating reflectance coating of right-angle prism 2, another right-angle surface places precious metal film layer substrate 5, the incident light of light source is incident from inclined-plane, according to right angle principle of reflection, no matter how incident angle changes, the light incided in right-angle surface all can reflect and be parallel to incident light and return in the right-angle surface of another plated film, along with the difference of angle, translation is produced relative to incident light by the back light of prism, by increasing convex lens in return light path, back light deviation is pooled to lens focus, focus places photodetector, according to the cumulative rule of lens, laser diverse location on convex lens of firm power is incident in parallel optical axis mode, the energy that focus is collected is almost constant, the receiving plane of photodetector is in the focus of convex lens, and it is vertical with optical axis, although the translation due to Returning beam causes the incident angle on photodetector target surface to change, detector received energy value can be caused to change, but this change is slow and regular, and can revise.Preferably, the emission of light of light source described in the application is through swivel arm rotating shaft core.
Preferably, right-angle prism 2 described in the application is placed on an adjustment rack, and the substrate solving different-thickness causes the translation problem of sensitive face, and preferably, the right angle length of side of right-angle prism 2 is 20-50mm.Described right-angle prism 2 is same glass material with precious metal film layer substrate 5, as K9 glass.
Preferably, described in the application, lens axis is parallel with light source optical axis, and photodetector 4 target surface is vertical with lens 3 optical axis.
Preferably, swivel arm described in the application is driven by a precise rotation platform.
When the surface plasmon absorption detector that the application provides is converted into spectrum demodulation mode, light source becomes wide spectrum light source, collimate via fiber optic conduction, described photodetector is converted to optical fiber access spectrometer, it comprises optical fiber, rotating disk, the joints of optical fibre and spectrometer; Described rotating disk, centered by the focus of convex lens, the joints of optical fibre is placed by rotating disk, the optical axis of the joints of optical fibre and the optical axis isoplanar of convex lens; Described optical fiber one end is connected with connector, and the other end is connected with spectrometer.
Preferably, detector described in the application also comprises polaroid 7, is placed between light source and right-angle prism 2.
The mode that surface plasmon absorption detects has two kinds, is the demodulation of angle solution mediation spectrum respectively:
1. the acquisition methods of angle demodulation spectra
1) system calibrating: LASER Light Source just can adopt 532nm, 633nm, 980nm, the monochromatic sources such as 1550nm, output intensity is stablized to adopt constant current driven to ensure, do not place substrate, the right-angle surface of prism is as reflecting surface, adjustment polaroid 7 makes TM component pass through, drive rotatable platform that light source incidence angle is changed, can be from small to large, also can be from big to small, a relative zero is set by electron devices such as Hall elements, from scanning zero point, drive pivoted arm to rotate, a step-length is often rotated in scanning process, collection primary detector outputs signal, final acquisition angle-light intensity curve, these data are as calibration curve.
2) angular spectrum collection: place substrate that is gold-plated or silverskin, sample cell is placed on it, adds testing sample, and swivel arm revert to reference zero, repeats 1) process, obtain angle-light intensity data curve, doing division with calibration curve is angular absorption spectral curve.The step-length precision of swivel arm depends on the structure of rotatable platform, can reach 0.01 degree completely.
2. the acquisition methods of spectrum demodulation:
1) change light source 1 into SLED or optical fiber collimator, tungsten light source is received in collimating apparatus by optical fiber, and detector 4 changes the rotating disk of an axle centered by focus into, joints of optical fibre is placed by rotating disk, the optical axis isoplanar of connector optical axis and lens 3.The light through lens can be allowed to be easy to enter into optical fiber by rotating rotating disk, the optical fiber other end is linked into spectrometer.
2), due to the otherness of sample refractive index, when especially studying the plasma filled waveguide character of transparent membrane, need adjustment incident angle that absorption peak is fallen in effective spectrum range.By driving swivel arm to change incident angle, then rotate the swivel arm of fixed fiber, and the real-time monitored curve of spectrum, when adjusting to proper angle, receiving spectrum curve reaches the highest, locks rotating disk by lock screw, can carry out the spectrum demodulation detection under this angle.
The above; be only the utility model preferably embodiment; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, all should be encompassed within protection domain of the present utility model.
Claims (8)
1. a surface plasmon absorption detector, is characterized in that, comprises swivel arm, light source, right-angle prism, precious metal film layer substrate, convex lens, photodetector or optical fiber access spectrometer; Described light source, convex lens and photodetector or intelligent acess spectrometer are placed on swivel arm, and photodetector is in the focus of convex lens, and light source optical axis is by the rotating shaft core of swivel arm; A right-angle surface plating reflectance coating of described right-angle prism, another right-angle surface places precious metal film layer substrate, and the right-angle surface of plating reflectance coating is in the spindle central of swivel arm.
2. a kind of surface plasmon absorption detector according to claim 1, is characterized in that, the emission of light of described light source is through swivel arm rotating shaft core.
3. a kind of surface plasmon absorption detector according to claim 1, is characterized in that, described right-angle prism is placed on an adjustment rack, and the right angle length of side of right-angle prism is 20-50mm.
4. a kind of surface plasmon absorption detector according to claim 1, is characterized in that, described right-angle prism and precious metal film layer substrate are same glass material.
5. a kind of surface plasmon absorption detector according to claim 1, it is characterized in that, described lens axis is parallel with light source optical axis, and photodetector target surface is vertical with lens axis.
6. a kind of surface plasmon absorption detector according to claim 1, is characterized in that, described swivel arm is driven by a precise rotation platform.
7. a kind of surface plasmon absorption detector according to claim 1, is characterized in that, described optical fiber access spectrometer comprises optical fiber, rotating disk, the joints of optical fibre and spectrometer; Described rotating disk, centered by the focus of convex lens, the joints of optical fibre is placed by rotating disk, the optical axis of the joints of optical fibre and convex lens optical axis isoplanar; Described optical fiber one end is connected with connector, and the other end is connected with spectrometer.
8. a kind of surface plasmon absorption detector according to claim 1, it is characterized in that, described detector also comprises polaroid, is placed between light source and right-angle prism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520809845.5U CN205038160U (en) | 2015-10-20 | 2015-10-20 | Surface plasma resonance absorption detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520809845.5U CN205038160U (en) | 2015-10-20 | 2015-10-20 | Surface plasma resonance absorption detector |
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| CN205038160U true CN205038160U (en) | 2016-02-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630195A (en) * | 2020-12-24 | 2021-04-09 | 广州大学 | Angle modulation type SPR sensor and SPR detection equipment |
| CN112858168A (en) * | 2021-01-08 | 2021-05-28 | 深圳万物创新集团有限公司 | SPR detector |
| CN113777075A (en) * | 2021-09-07 | 2021-12-10 | 电子科技大学 | Concentration measurement method based on light field Hall effect and orbital angular momentum spectrum |
-
2015
- 2015-10-20 CN CN201520809845.5U patent/CN205038160U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630195A (en) * | 2020-12-24 | 2021-04-09 | 广州大学 | Angle modulation type SPR sensor and SPR detection equipment |
| CN112858168A (en) * | 2021-01-08 | 2021-05-28 | 深圳万物创新集团有限公司 | SPR detector |
| CN113777075A (en) * | 2021-09-07 | 2021-12-10 | 电子科技大学 | Concentration measurement method based on light field Hall effect and orbital angular momentum spectrum |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160217 Termination date: 20161020 |