CN103398948A - ATR (attenuated total reflectance) probe for Fourier transform infrared spectrometer - Google Patents
ATR (attenuated total reflectance) probe for Fourier transform infrared spectrometer Download PDFInfo
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- CN103398948A CN103398948A CN2013103539940A CN201310353994A CN103398948A CN 103398948 A CN103398948 A CN 103398948A CN 2013103539940 A CN2013103539940 A CN 2013103539940A CN 201310353994 A CN201310353994 A CN 201310353994A CN 103398948 A CN103398948 A CN 103398948A
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Abstract
The invention discloses an ATR (attenuated total reflectance) probe for a Fourier transform infrared spectrometer. The ATR probe for the Fourier transform infrared spectrometer comprises an ATR crystal 1, lenses 2 and 7, an internally film coated light tube 4, light tube fixing jigs 3 and 6, an infrared sensor 8, a pre-amplification filter circuit 9 and an outer shell 5. Incident light enters into the internally film coated light tube 4, passes through the lens 2 to enter the ATR crystal 1, goes out of the crystal after being reflected at least twice in the crystal 1, and then is collected and focused on a photosensitive surface of the infrared sensor 8 through the lens 7; the infrared sensor 8 converts light signals into electrical signals, and then the electrical signals are subjected to signal amplification and modulation by the pre-amplification filter circuit 9 and are output. According to the invention, the conduction of incident light is carried out by the heavy-caliber light tube, and the utilization ratio of light energy is improved; the light path transmission loss is reduced by virtue of the infrared sensor built-in detection method, so that high detection sensitivity and signal to noise ratio can be achieved. The ATR probe for the Fourier transform infrared spectrometer provided by the invention has wide application prospects in multiple fields of biology, medicine, geology, chemistry, materialogy and the like.
Description
Technical field
The invention belongs to physics photonics field, particularly a kind of probe of ATR for Fourier transform infrared spectrometer.
Background technology
Attenuated total reflection (Attenuated Total Reflectance, ATR) spectral technique is a kind of application technology very widely in the examination of infrared spectrum technology, and it has become a kind of infrared sample test means that ftir analysis test job person often uses.
ATR in actual applications,, as one of important experimental technique of infra-red sepectrometry, just demonstrates its unique advantage and wide application prospect from the beginning.Because it does not need by seeing through the signal of sample, but obtain the structural information of sample top layer organic component by the reflected signal of sample surfaces.Not only simplify the manufacturing process of sample, and greatly enlarged the range of application of infra-red sepectrometry.Make the traditional penetrant method of many employings can't sample preparation, perhaps sample preparation process be very complicated, difficulty large and the undesirable experiment of effect becomes possibility.Therefore, be widely used in the analysis for surface composition of the macromolecular material goods such as plastics, fiber, rubber, coating, bonding agent.
For ATR, it mainly comprises several large parts: light imports parts, atr crystal, light-output parts, infrared detector and circuit etc.ATR commodity light in the market imports and derives the main infrared optical fiber that adopts, and it is expensive.Also there is small part light to import and derive and respectively adopt a hollow light pipe, because the loss of light is larger, weak output signal, its output light generally adopts the MCT detecting device of liquid nitrogen refrigerating to detect, and uses very trouble.
Summary of the invention
In order to overcome the deficiency of prior art, the present invention has realized a kind of simple in structure, and is with low cost, uses convenient ATR.Adopt the hollow light tube of the infrared high reflection film of plating in heavy caliber to import parts as light, output has saved light-output parts, the DLATGS detecting device that directly will need not liquid nitrogen refrigerating is embedded into probe inside and carries out the detection of light, the minimizing of optic path link, greatly reduced optical energy loss, detecting of signal is more prone to.Therefore, not only cost is low for it, and signal to noise ratio (S/N ratio) is high, and is easy to use, and it has broad application prospects at numerous areas such as biology, medical science, geology, materialogies.
Technical scheme of the present invention is:
A kind of probe of ATR for Fourier transform infrared spectrometer, comprise shell 5, atr crystal 1, thoroughly
Mirror 2 and lens 7, interior plated film light pipe 4, light pipe stationary fixture 3 and 6, infrared sensor 8, preposition filtering and amplifying circuit 9;
The both ends open of shell 5, atr crystal 1 is fixed on the opening part of shell 5 one ends, lens 2, light pipe
Atr crystal 1 has two inclined-planes, and lens 2 and lens 7 are aimed at respectively two inclined-planes of atr crystal 1;
After incident light is injected interior plated film light pipe 4, enter atr crystal 1 after lens 2 couplings, at the crystal 1 rear ejaculation crystal of internal reflection at least twice, collect and focus on the photosurface of infrared sensor 8 through lens 7 again, infrared sensor 8 converts light signal to electric signal, then through preposition filtering and amplifying circuit 9, carries out exporting after the signal amplification filtering.
Be provided with O shape circle mounting groove 10 on described shell 5, be used for mounting O-shaped rings, shell 5 is snugly fitted on tank body or reactor.
Described interior plated film light pipe 4 is made by quartzy double glazing, and the light pipe inwall is coated with infrared light at 4000cm-1 to the rete that all has high reflectance in the 400cm-1 wavelength band; Interior plated film light pipe 4 internal diameters are 0.5-5mm.
Described atr crystal 1 comprises that at least one has the section on the surface of taper or truncated cone shape, semi-cone angle between 38-50 °, preferred 45° angle; Semi-cone angle refers to the angle between the side of the axis of symmetry of circular cone and circular cone; Atr crystal 1 is made by ZnSe, adamas, sapphire, KBr or Ge.
The present invention is built in infrared sensor 8 in housing 5, and the light through lens 7 converge, directly focus on the photosurface of infrared sensor 8; The light guide member that does not have photoconductive tube or optical fiber and so on due to emergent light, therefore, greatly reduced the loss of luminous energy, and this is very favourable for improving signal to noise ratio (S/N ratio).
The present invention, due to the loss that has greatly reduced luminous energy, therefore, can adopt the DLATGS sensor as photo-sensitive cell.Conventional ATR is because emergent light has also adopted light guide member, and optical energy loss is too large, generally must adopt the high sensitivity MCT sensor of liquid nitrogen refrigerating, uses very trouble.The present invention adopts the DLATGS device that need not to freeze to carry out sensitization, uses more convenient.Certainly, the present invention does not get rid of use MCT sensor as photo-sensitive cell.
The present invention also is placed in preposition filtering and amplifying circuit 9 in housing 5 simultaneously, sensor signal is amplified conditioning nearby, and this disturbs all beneficial for reducing lead-in wire, electromagnetism etc.
The present invention has adopted the structure that is built in probe without outgoing light guide member, infrared sensor, in fact, also do not get rid of the emergent light after lens 7 is also adopted with the similarly interior plated film light pipe of interior plated film light pipe 4 and carries out the conduction of emergent light, the mode of emergent light being drawn housing 6 detects.
Compared with prior art, the invention has the beneficial effects as follows:
1, adopted in heavy caliber hollow and plated the conducting parts of infrared high-reflecting film light pipe as incident light, it is large that it possesses luminous flux, the characteristics that optical energy loss is little.
2, adopted the infrared sensor embedding structure, saved the emergent light conducting parts, not only provided cost savings, and greatly reduced the capacity loss of emergent light, made high s/n ratio, high-sensitivity detection become possibility.
3, owing to having reduced light energy losses, make detectable luminous energy larger, therefore can adopt the DLATGS infrared sensor that need not liquid nitrogen refrigerating to carry out the detection of light, greatly improved the convenience that uses.And present commercial ATR probe generally needs to use the MCT of liquid nitrogen refrigerating to carry out optical signal detecting, uses very inconvenience.
Description of drawings
Fig. 1 is one-piece construction schematic diagram of the present invention.
Wherein, 1-atr crystal, 2-lens, 3-light pipe stationary fixture, 4-interior plated film light pipe, 5-shell, 6-light pipe stationary fixture, 7-lens, 8-infrared sensor, 9-preposition filtering and amplifying circuit, 10-O shape circle mounting groove.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done further detailed description.
Fig. 1 is one-piece construction schematic diagram of the present invention, the present invention includes shell 5, atr crystal 1, lens 2
With lens 7, interior plated film light pipe 4, light pipe stationary fixture 3 and 6, infrared sensor 8, preposition filtering and amplifying circuit 9; The both ends open of shell 5, atr crystal 1 is fixed on the opening part of shell 5 one ends, lens 2, light pipe stationary fixture 3 and 6, the fixing side in the enclosure of interior plated film light pipe 4, lens 2 join with atr crystal 1, interior plated film light pipe 4 joins with lens 2, light pipe stationary fixture 3 and 6 is arranged on the two ends of interior plated film light pipe 4, and light pipe stationary fixture 6 is positioned at the opening part of shell 5 other ends; Lens 7, infrared sensor 8, preposition filtering and amplifying circuit 9 be fixing opposite side in the enclosure successively; Lens 7 join with atr crystal 1; Atr crystal 1 has two inclined-planes, and lens 2 and lens 7 are aimed at respectively two inclined-planes of atr crystal 1; Be provided with O shape circle mounting groove 10 on shell 5, be used for mounting O-shaped rings, shell 5 is snugly fitted on tank body or reactor.
The light path transfer route is as shown by the arrows in Figure 1: at first incident ray enters light pipe 4, enter atr crystal 1 through lens 2 again, shine on first inclined-plane of atr crystal 1 taper after reflection, shine on second inclined-plane of taper, again occur to penetrate from atr crystal 1 after reflection on this inclined-plane, then through lens 7, converge on the photosurface that focuses on infrared sensor 8.Light path shown in Figure 1, light is at interior 2 secondary reflections that occurred of crystal 1.In fact, but in atr crystal 1 truncated cone shape design, as long as change the position of truncated cone, the reflection more than 2 times just can occur in crystal.Therefore, the right that will advocate of present patent application is not limited to 2 secondary reflections.
What the lead-in light parts adopted is interior plated film light pipe 4, and the cleaning of light pipe inwall is smooth, and plates the rete high to infrared reflectivity, thereby greatly reduces the energy loss of incident light after interior plated film light pipe 4 inwall Multi reflections.Institute's film plating layer is optimized design mainly for the infrared light in 4000cm-1 ~ 400cm-1 wavelength band.Compare with traditional optical fiber type ATR probe, because incident light leaded light of the present invention only has a light pipe, and mostly the optical fiber type probe is to be comprised of multifiber, therefore, from reflected energy, loses, and the present invention is dominant.In addition, from luminous flux, the present invention has adopted the heavy caliber light pipe, therefore, the luminous flux that can pass through also have larger advantage.
, by the light of interior plated film light pipe 4, through lens 2, be coupled in atr crystal 1.Due to after interior plated film light pipe 4, after part light carries out Multi reflection, some is dispersed, if do not add the processing direct irradiation, does not enter atr crystal 1, will cause so the loss of a large amount of luminous energies.The present invention adopts lens 2 to carry out the shaping of light beam, makes that the light that enters after atr crystal 1 is as much as possible can be penetrated and be collected from crystal.
From the light of atr crystal 1 outgoing, focus on through lens 7, at the rear placement infrared sensor 8 of lens 7, the irradiation after lens 7 focus on the photosurface of infrared sensor 8, is realized opto-electronic conversion.Present ATR probe on the market, generally adopts optical fiber or light pipe to export to the probe outside to the light after the atr crystal outgoing and carry out Photoelectric Detection again, and mode of the present invention is the interior infrared sensor of placing of popping one's head in.Therefore, the present invention has saved an output optical transmission component, thereby has reduced due to the energy loss in optical transmission process, also just is equivalent to indirectly improve luminous energy, makes high-sensitivity detection become possibility.
At present, the existing mode of ATR probe vitro detection that the output gloss is drawn light with light guide member, generally must adopt the high sensitivity MCT detecting device of liquid nitrogen refrigerating to carry out the detection of light signal on the market, and common DLATGS can't meet the demands.And the present invention, due to the mode that has adopted the built-in infrared sensor, has reduced the energy loss in the optical transmission process, therefore, can adopt the relatively cheap and DLATGS sensor that uses that need not to freeze of cost to carry out the detection of light signal.Thereby element required for the present invention is few, and sensor price used is low, easy to use, and this is main advantage of the present invention.
Pre-service, followed by the preposition filtering and amplifying circuit 9 of a small volume, can be carried out to signal nearby in infrared sensor 8 back, and in addition, it is placed in housing 1, can effectively prevent the extraneous interference such as electromagnetism.
The present invention except can the built-in infrared sensor, also can, to through atr crystal 1 outgoing, deriving outside sonde body by interior coated hollow light pipe through the light after lens 7, utilize the MCT sensor to carry out sensed light signal again.
For shell 5, the present invention adopts metal material, first-selected stainless steel material.Atr crystal 1 is combined with housing closely by O-ring seal, can effectively guarantee not have fluid seepage to enclosure interior after probe inserts liquid, thereby protection is placed in the light pipe, lens, infrared sensor, circuit board of enclosure interior etc., is not damaged.
Interior plated film light pipe 4 firmly is placed in enclosure interior by light pipe stationary fixture 3 and 6, and preposition filtering and amplifying circuit 9 is inserted and secured on housing 1 inside by trench structure.
The O shape circle mounting groove 10 of shell 5 outsides, can be placed in O shape circle in this groove, inserts in the compound reactor that routinizes, and plays sealing function.
Claims (4)
1. an ATR who is used for Fourier transform infrared spectrometer pops one's head in, and it is characterized in that: comprise shell (5),
Atr crystal (1), lens (2) and lens (7), interior plated film light pipe (4), light pipe stationary fixture (3) and (6), infrared sensor (8), preposition filtering and amplifying circuit (9);
The both ends open of shell (5), atr crystal (1) is fixed on the opening part of shell (5) one ends, lens (2), light pipe stationary fixture (3) and (6), the fixing side in the enclosure of interior plated film light pipe (4), lens (2) join with atr crystal (1), interior plated film light pipe (4) joins with lens (2), light pipe stationary fixture (3) and (6) are arranged on the two ends of interior plated film light pipe (4), and light pipe stationary fixture (6) is positioned at the opening part of shell (5) other end;
Lens (7), infrared sensor (8), preposition filtering and amplifying circuit (9) be fixing opposite side in the enclosure successively; Lens (7) join with atr crystal (1);
Atr crystal (1) has two inclined-planes, and lens (2) and lens (7) are aimed at respectively two inclined-planes of atr crystal (1);
After incident light is injected interior plated film light pipe (4), enter atr crystal (1) after lens (2) coupling, at crystal (1) internal reflection at least twice rear ejaculation crystal, collect and focus on the photosurface of infrared sensor (8) through lens (7) again, infrared sensor (8) converts light signal to electric signal, then through preposition filtering and amplifying circuit (9), carries out exporting after the signal amplification filtering.
2. a kind of ATR for Fourier transform infrared spectrometer according to claim 1 pops one's head in, it is characterized in that: be provided with O shape circle mounting groove (10) on described shell (5), be used for mounting O-shaped rings, shell (5) is snugly fitted on tank body or reactor.
3. a kind of ATR for Fourier transform infrared spectrometer according to claim 1 pops one's head in, and it is characterized in that: described interior plated film light pipe (4) is made by quartzy double glazing, the infrared high-reflecting film of interior plating; Interior plated film light pipe (4) internal diameter is 0.5-5mm.
4. a kind of ATR for Fourier transform infrared spectrometer according to claim 1 pops one's head in, and it is characterized in that: described atr crystal (1) comprises that at least one has the section on the surface of taper or truncated cone shape, and semi-cone angle is between 38-50 °; Atr crystal (1) is made by ZnSe, adamas, sapphire or Ge.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103852439A (en) * | 2014-03-28 | 2014-06-11 | 北京雪迪龙科技股份有限公司 | Volatile organic compound monitoring equipment and method |
| CN104062009A (en) * | 2014-06-26 | 2014-09-24 | 武汉大学 | High luminous flux infrared ATR probe |
| CN104535539A (en) * | 2014-12-23 | 2015-04-22 | 南京航空航天大学 | Intermediate-infrared hollow optical fiber ATR coupling probe |
| CN105424610A (en) * | 2015-11-10 | 2016-03-23 | 上海交通大学 | Optical fiber type ATR probe achieving simultaneous measurement of side wall and top end of probe |
| CN105806796A (en) * | 2016-03-24 | 2016-07-27 | 电子科技大学 | Molecular sensor |
| CN106556568A (en) * | 2015-09-23 | 2017-04-05 | 安捷伦科技有限公司 | Using the infrared spectrometer and scanner of attenuated total reflectance |
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