An accessory with adjustable optical path for an infrared spectrometer and an infrared spectrometer

Abstract

The present invention discloses an optical path adjustable accessory for an infrared spectrometer and an infrared spectrometer, belonging to the technical field of infrared spectrometers, which can solve the problems that the existing infrared spectrometers frequently disassemble accessories when measuring substances in different forms, with cumbersome operations and possible instrument failures. The accessory for the infrared spectrometer includes: a solid-liquid detection structure for performing infrared tests on solid samples or liquid samples; a gas detection structure for performing infrared tests on gas samples; and a first optical path adjustment structure arranged on the light incident side of the solid-liquid detection structure and the gas detection structure for adjusting the optical path of the test light so that the test light is incident into the solid-liquid detection structure or the gas detection structure. The present invention is used for infrared spectrum detection.

Description

Technical Field

[0001] The present invention relates to an optical path adjustable accessory for an infrared spectrometer and an infrared spectrometer, belonging to the technical field of infrared spectrometers. Background Art

[0002] As an analytical instrument, the infrared spectrometer is widely used in material detection, and there are also many measurement accessories for its various extended applications. The infrared spectrometer has the advantages of higher resolution, wider spectral range, faster detection speed, etc., and can be used in the fields of gas, liquid, and solid sample detection.

[0003] When measuring solid (powder-like) or liquid substances, an Attenuated Total Reflectance (ATR) accessory can be used in the infrared spectrometer. The ATR accessory is used for surface testing of samples, and for samples that are inconvenient to prepare samples by conventional methods or cannot obtain satisfactory spectral information by conventional sample preparation methods, such as elastomers, thin films, etc. When measuring gaseous substances, it is necessary to remove the ATR accessory, replace it with a gas cell accessory, and then perform the measurement and analysis of gaseous substances.

[0004] At present, there are various types of commercial ATR accessories and gas cell accessories. When the existing infrared spectrometer accessories complete the analysis of samples in different forms, it is necessary to frequently replace the ATR accessory and the gas cell. This not only increases the complexity of the test, but also easily affects the accuracy and service life of the accessories. At the same time, it will make the inside of the accessory chamber often exposed to the external environment, which greatly increases the risk of dust, liquid, impurities, etc. entering the accessory chamber, and may even cause damage in severe cases. Summary of the Invention

[0005] The present invention provides an optical path adjustable accessory for an infrared spectrometer and an infrared spectrometer, which can solve the problems that the existing infrared spectrometer needs to frequently disassemble the accessory when measuring substances in different forms, the operation is cumbersome and may cause instrument failures.

[0006] On the one hand, the present invention provides an optical path adjustable accessory for an infrared spectrometer, including:

[0007] A solid-liquid detection structure for performing infrared testing on solid samples or liquid samples;

[0008] A gas detection structure for performing infrared testing on gas samples;

[0009] A first optical path adjustment structure is arranged on the incident light side of the solid-liquid detection structure and the gas detection structure, and is used for adjusting the optical path of the test light so that the test light is incident into the solid-liquid detection structure or the gas detection structure.

[0010] Optionally, it further includes: a second optical path adjustment structure, disposed on the light-emitting side of the solid-liquid detection structure and the gas detection structure, for adjusting the optical path of the emitted light of the solid-liquid detection structure or the gas detection structure, so that the emitted light is incident on the detection component.

[0011] Optionally, the first optical path adjustment structure includes: a first rotating reflection unit, a first parabolic reflection unit, and a second parabolic reflection unit;

[0012] The first rotating reflection unit is configured to reflect the test light to the first parabolic reflection unit or the second parabolic reflection unit;

[0013] The first parabolic reflection unit is disposed on the light-incident side of the solid-liquid detection structure, and is configured to converge the received test light and then reflect it into the solid-liquid detection structure;

[0014] The second parabolic reflection unit is disposed on the light-incident side of the gas detection structure, and is configured to converge the received test light and then reflect it into the gas detection structure.

[0015] Optionally, the second optical path adjustment structure includes: a second rotating reflection unit, a third parabolic reflection unit, and a fourth parabolic reflection unit;

[0016] The third parabolic reflection unit is disposed on the light-emitting side of the solid-liquid detection structure, and is configured to convert the emitted light of the solid-liquid detection structure into parallel light and then reflect it to the second rotating reflection unit;

[0017] The fourth parabolic reflection unit is disposed on the light-emitting side of the gas detection structure, and is configured to convert the emitted light of the gas detection structure into parallel light and then reflect it to the second rotating reflection unit;

[0018] The second rotating reflection unit is configured to reflect the received emitted light to the detection component.

[0019] Optionally, both the first rotating reflection unit and the second rotating reflection unit include:

[0020] A base;

[0021] A motor, disposed on the base;

[0022] A first bracket, disposed on the motor;

[0023] A double-sided mirror, disposed on the first bracket;

[0024] The motor is configured to drive the first bracket and the double-sided mirror to rotate.

[0025] Optionally, the first paraboloid reflection unit, the second paraboloid reflection unit, the third paraboloid reflection unit, and the fourth paraboloid reflection unit each include:

[0026] A second bracket;

[0027] A paraboloid reflector disposed on the second bracket.

[0028] Optionally, the first optical path adjustment structure further includes a first housing, and the first rotation reflection unit, the first paraboloid reflection unit, and the second paraboloid reflection unit are all disposed within the first housing; light incident holes allowing test light to pass through are respectively disposed at positions on the first housing corresponding to the incident light directions of the solid-liquid detection structure and the gas detection structure;

[0029] The second optical path adjustment structure further includes a second housing, and the second rotation reflection unit, the third paraboloid reflection unit, and the fourth paraboloid reflection unit are all disposed within the second housing; light exit holes allowing the emitted light to pass through are respectively disposed at positions on the second housing corresponding to the exit light directions of the solid-liquid detection structure and the gas detection structure.

[0030] Optionally, the solid-liquid detection structure includes: a first plane mirror, a second plane mirror, an ATR crystal, and a pressing head;

[0031] The first plane mirror is configured to reflect the incident test light to the ATR crystal;

[0032] A solid sample or a liquid sample to be measured is placed on the ATR crystal;

[0033] The second plane mirror is configured to reflect the light reflected from the contact surface between the ATR crystal and the solid sample or the liquid sample to be measured into the second optical path adjustment structure;

[0034] The pressing head is disposed above the ATR crystal and is configured to press the solid sample to be measured on the ATR crystal.

[0035] Optionally, the gas detection structure includes:

[0036] A gas chamber provided with an air inlet and an air outlet;

[0037] A first lens disposed near the light incident side of the gas chamber and configured to converge the incident test light;

[0038] A second lens disposed near the light exit side of the gas chamber and configured to convert the converged light passing through the gas sample to be measured into parallel light and then transmit it into the second optical path adjustment structure.

[0039] On the other hand, the present invention provides an infrared spectrometer, comprising:

[0040] A light source assembly for emitting test light;

[0041] An infrared spectrometer accessory as described in any one of the above, disposed on the light-emitting side of the light source assembly, for performing infrared tests on solid samples, liquid samples or gas samples using the test light;

[0042] A detection assembly, disposed on the light-emitting side of the infrared spectrometer accessory, for detecting the emitted light of the infrared spectrometer accessory.

[0043] The beneficial effects that the present invention can produce include:

[0044] The infrared spectrometer accessory provided by the present invention, by simultaneously integrating a solid-liquid detection structure and a gas detection structure, and using a first optical path adjustment structure to switch the test light to selectively enter the solid-liquid detection structure or the gas detection structure, can thus achieve rapid qualitative testing of solid, liquid, and gas samples without replacing the accessory, solving the problem that existing infrared spectrometers require frequent disassembly of accessories when measuring substances in different forms, with cumbersome operation and possible instrument failures. Description of the Drawings

[0045] Figure 1 Schematic assembly diagram of the infrared spectrometer accessory provided by an embodiment of the present invention;

[0046] Figure 2 Schematic diagram of the shutter of the first housing provided by an embodiment of the present invention;

[0047] Figure 3 Schematic right view and left view of the infrared spectrometer accessory provided by an embodiment of the present invention;

[0048] Figure 4 Schematic diagram of the first housing provided by an embodiment of the present invention;

[0049] Figure 5 Schematic diagram of the parabolic reflection unit structure provided by an embodiment of the present invention;

[0050] Figure 6 Schematic diagram of the rotating reflection unit structure provided by an embodiment of the present invention;

[0051] Figure 7 Schematic top view of the overall structure of the infrared spectrometer provided by an embodiment of the present invention;

[0052] Figure 8 Schematic diagram of the overall structure of the infrared spectrometer provided by an embodiment of the present invention;

[0053] Figure 9Schematic diagram of the gas detection structure provided by the embodiment of the present invention;

[0054] Figure 10 Optical path diagram of the gas detection structure provided by the embodiment of the present invention;

[0055] Figure 11 Schematic diagram of the solid-liquid detection structure provided by the embodiment of the present invention;

[0056] Figure 12 Optical path diagram of the solid-liquid detection structure provided by the embodiment of the present invention;

[0057] Figure 13 Schematic diagram of the optical path switching of the accessory of the infrared spectrometer provided by the embodiment of the present invention;

[0058] Figure 14 Three-dimensional model diagram of the overall device of the infrared spectrometer provided by the embodiment of the present invention.

[0059] List of components and reference numerals:

[0060] 10. Solid-liquid detection structure; 11. First plane mirror; 12. Second plane mirror; 13. ATR crystal; 14. Indenter; 15. Base; 16. Crystal disk; 17. First optical window; 18. Second optical window; 20. Gas detection structure; 21. Gas chamber; 22. First lens; 23. Second lens; 24. Air inlet; 25. Air outlet; 26. Third optical window; 27. Fourth optical window; 30. First optical path adjustment structure; 31. First rotating reflection unit; 311. Base; 312. Motor; 313. First bracket; 314. Double-sided mirror; 32. First paraboloid reflection unit; 321. Second bracket; 322. Parabolic mirror; 33. Second paraboloid reflection unit; 34. First housing; 341. Shutter; 40. Second optical path adjustment structure; 41. Second rotating reflection unit; 42. Third paraboloid reflection unit; 43. Fourth paraboloid reflection unit; 51. Light source; 52. Interferometer; 53. First mirror; 54. Second mirror; 61. Third mirror; 62. Detector. Detailed implementation manners

[0061] The present invention will be described in detail below with reference to the embodiments, but the present invention is not limited to these embodiments.

[0062] The embodiment of the present invention provides an accessory of an infrared spectrometer with adjustable optical path, as Figures 1 to 14 shown, including:

[0063] A solid-liquid detection structure 10 for performing infrared tests on solid samples or liquid samples.

[0064] Refer to Figure 11 and 12As shown in the figure, the solid-liquid detection structure 10 is responsible for testing solid and liquid samples of the infrared spectrometer, specifically including: the indenter 14, the base 15, the ATR crystal 13, the first optical window 17, the crystal disk 16, the first plane mirror 11, the second plane mirror 12, and the second optical window 18.

[0065] The solid and liquid samples are placed on the contact surface of the ATR crystal 13. If measuring solid or powder samples, the indenter 14 is required to press the sample tightly to ensure full contact between the sample and the crystal surface. If measuring liquid samples, it is only necessary to smear and cover the crystal surface. If the liquid is volatile, it can be covered with a cap.

[0066] The crystal disk 16 is arranged on the base 15 for placing the ATR crystal 13; the first optical window 17 is arranged at the light inlet of the base 15; the second optical window 18 is arranged at the light outlet of the base 15; the first plane mirror 11 is used to reflect the incident test light to the ATR crystal 13, and the test light undergoes total internal reflection at the contact surface between the ATR crystal 13 and the solid or liquid sample to be measured. The second plane mirror 12 is used to reflect the reflected light into the second optical path adjustment structure 40.

[0067] The solid-liquid detection structure 10 is designed based on the principle of internal optical reflection. When the test light enters the solid-liquid detection structure 10, first the test light passes through the first optical window 17, then is reflected by the first plane mirror 11 into the ATR crystal 13, and then undergoes total internal reflection at the contact surface between the ATR crystal 13 and the test sample. The reflected light is then reflected by the second plane mirror 12 and penetrates through the second optical window 18 to exit the solid-liquid detection structure 10.

[0068] The gas detection structure 20 is used for infrared testing of gas samples.

[0069] Reference Figure 9 and 10 As shown in the figure, the gas detection structure 20 is responsible for testing gas samples of the infrared spectrometer, specifically including: the third optical window 26, the first lens 22, the air inlet 24, the air outlet 25, the gas chamber 21, the second lens 23, and the fourth optical window 27.

[0070] The third optical window 26 is arranged at the light inlet of the gas chamber 21, and the fourth optical window 27 is arranged at the light outlet of the gas chamber 21; both the air inlet 24 and the air outlet 25 are arranged on the gas chamber 21; both the first lens 22 and the second lens 23 are arranged inside the gas chamber 21. The first lens 22 is arranged near the light inlet side of the gas chamber 21 for converging the incident test light; the second lens 23 is arranged near the light outlet side of the gas chamber 21 for converting the converging light passing through the gas sample to be measured into parallel light and then transmitting it into the second optical path adjustment structure 40.

[0071] During specific tests, the gas sample to be measured is filled in the gas chamber 21. The gas sample is injected through the inlet 24 of the gas chamber 21, and the waste gas is discharged through the outlet 25. The incident test light passes through the third optical window 26 and enters the gas chamber 21. The light is converged by the first lens 22 to the midpoint of the gas chamber 21 and then continues to diverge, passing through the second lens 23 and the fourth optical window 27 and leaving the gas detection structure 20.

[0072] The first optical path adjustment structure 30 is arranged on the light incident side of the solid-liquid detection structure 10 and the gas detection structure 20, and is used to adjust the optical path of the test light so that the test light is incident on the solid-liquid detection structure 10 or the gas detection structure 20.

[0073] Specifically, as shown in the left figure in Figure 3 The first optical path adjustment structure 30 includes: a first rotating reflection unit 31, a first parabolic reflection unit 32, and a second parabolic reflection unit 33; the first rotating reflection unit 31 is used to reflect the test light to the first parabolic reflection unit 32 or the second parabolic reflection unit 33; the first parabolic reflection unit 32 is arranged on the light incident side of the solid-liquid detection structure 10 and is used to converge the received test light and then reflect it into the solid-liquid detection structure 10; the second parabolic reflection unit 33 is arranged on the light incident side of the gas detection structure 20 and is used to converge the received test light and then reflect it into the gas detection structure 20.

[0074] Furthermore, the infrared spectrometer accessory may further include: a second optical path adjustment structure 40, which is arranged on the light exit side of the solid-liquid detection structure 10 and the gas detection structure 20, and is used to adjust the optical path of the light exiting from the solid-liquid detection structure 10 or the gas detection structure 20 so that the exiting light is incident on the detection component.

[0075] Specifically, as shown in the right figure in Figure 3 The second optical path adjustment structure 40 includes: a second rotating reflection unit 41, a third parabolic reflection unit 42, and a fourth parabolic reflection unit 43.

[0076] The third parabolic reflection unit 42 is arranged on the light exit side of the solid-liquid detection structure 10 and is used to convert the light exiting from the solid-liquid detection structure 10 into parallel light and then reflect it to the second rotating reflection unit 41; the fourth parabolic reflection unit 43 is arranged on the light exit side of the gas detection structure 20 and is used to convert the light exiting from the gas detection structure 20 into parallel light and then reflect it to the second rotating reflection unit 41; the second rotating reflection unit 41 is used to reflect the received exiting light into the detection component.

[0077] Among them, as shown in Figure 6As shown, both the first rotation reflection unit 31 and the second rotation reflection unit 41 include a base 311; a motor 312 disposed on the base 311; a first bracket 313 disposed on the motor 312; and a double-sided mirror disposed on the first bracket 313. The motor 312 is used to drive the first bracket 313 and the double-sided mirror to rotate.

[0078] In practical applications, metal reflection films can be plated on both surfaces of the double-sided mirror, such as metal reflection films made of gold, silver, aluminum, etc., to improve the light reflectivity. In the embodiments of the present invention, the rotation of the double-sided mirror is controlled by controlling the motor 312. By adjusting the angle of the double-sided mirror, the incident light path can be selectively refracted into the gas detection structure 20 or the solid-liquid detection structure 10. Thus, rapid qualitative testing of solid, liquid, and gas samples can be achieved without replacing accessories.

[0079] Reference Figure 5 As shown, the first parabolic reflection unit 32, the second parabolic reflection unit 33, the third parabolic reflection unit 42, and the fourth parabolic reflection unit 43 all include: a second bracket 321; and a parabolic mirror 322 disposed on the second bracket 321.

[0080] In practical applications, metal reflection films can be plated on the surface of the parabolic mirror 322, such as metal reflection films made of gold, silver, aluminum, etc., to improve the light reflectivity. The parabolic mirror 322 can converge the test light reflected by the double-sided mirror and then reflect it into the corresponding gas detection structure 20 or solid-liquid detection structure 10, or convert the outgoing light of the gas detection structure 20 or solid-liquid detection structure 10 into parallel light and then reflect it to the double-sided mirror, and then the double-sided mirror reflects it to the detection component.

[0081] In the embodiments of the present invention, the first optical path adjustment structure 30 further includes a first housing 34. The first rotation reflection unit 31, the first parabolic reflection unit 32, and the second parabolic reflection unit 33 are all disposed in the first housing 34. Light incident holes allowing test light to pass through are respectively provided at positions on the first housing 34 corresponding to the incident light directions of the solid-liquid detection structure 10 and the gas detection structure 20.

[0082] The second optical path adjustment structure 40 further includes a second housing. The second rotation reflection unit 41, the third parabolic reflection unit 42, and the fourth parabolic reflection unit 43 are all disposed in the second housing. Light exit holes allowing outgoing light to pass through are respectively provided at positions on the second housing corresponding to the outgoing light directions of the solid-liquid detection structure 10 and the gas detection structure 20.

[0083] The light incident aperture, light exit aperture, and paraboloid mirror 322 corresponding to the solid-liquid detection structure 10 are all coaxial with the solid-liquid detection structure 10; the light incident aperture, light exit aperture, and paraboloid mirror 322 corresponding to the gas detection structure 20 are all coaxial with the gas detection structure 20.

[0084] In practical applications, shielding plates 341 are provided on the sides of the first housing 34 and the second housing that are far from the solid-liquid detection structure 10 and the gas detection structure 20. The shielding plates 341 are used to cover the left and right sides of the infrared spectrometer accessory to prevent dust from entering. Small holes are provided on the left and right shielding plates 341 to allow the incident and outgoing light to pass through. The axis of the hole is on the same straight line as the center position of the double-sided mirror.

[0085] Another embodiment of the present invention provides an infrared spectrometer, including: a light source assembly for emitting test light; an infrared spectrometer accessory as described in any one of the above, provided on the light exit side of the light source assembly for performing infrared tests on solid samples, liquid samples, or gas samples using the test light; a detection assembly provided on the light exit side of the infrared spectrometer accessory for detecting the outgoing light of the infrared spectrometer accessory.

[0086] Among them, referring Figure 7 As shown, the light source assembly may include: a light source 51, an interferometer 52, a first mirror 53, and a second mirror 54; the detection assembly may include a third mirror 61 and a detector 62.

[0087] The light emitted from the light source 51 forms parallel interference light after passing through the interferometer 52, and then is reflected by the first mirror 53 and the second mirror 54 to form test light; the test light is selectively reflected by the rotatable double-sided mirror to the paraboloid mirror 322 corresponding to the gas detection structure 20 or the solid-liquid detection structure 10, and then is converged and reflected by the paraboloid mirror 322 into the gas detection structure 20 or the solid-liquid detection structure 10; the light emitted from the gas detection structure 20 or the solid-liquid detection structure 10 is converted into parallel light by the corresponding paraboloid mirror 322 and then reflected to the rotatable double-sided mirror. After being reflected by the rotatable double-sided mirror to the third mirror 61, it is then reflected by the third mirror 61 to the detector 62 for reception, and finally the detection of solid-liquid substances or gas substances is completed.

[0088] By simultaneously integrating the solid-liquid detection structure 10 and the gas detection structure 20, and using the first optical path adjustment structure 30 to switch the test light to selectively enter the solid-liquid detection structure 10 or the gas detection structure 20, the present invention can achieve rapid qualitative testing of solid, liquid, and gas samples without replacing the accessory, solving the problems of frequent disassembly of the accessory, cumbersome operation, and possible instrument failure when the existing infrared spectrometer measures substances in different forms.

[0089] The above are only several embodiments of the present application and do not impose any form of limitation on the present application. Although the present application is disclosed above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the relevant art can make some changes or modifications within the scope of the technical solution of the present application by using the disclosed technical content, which are equivalent to equivalent implementation cases and all fall within the scope of the technical solution.

Claims

1. An optical path adjustable infrared spectrometer accessory, characterized in that, Comprising: A solid-liquid detection structure for performing infrared testing on solid samples or liquid samples; A gas detection structure for performing infrared testing on gas samples; A first optical path adjustment structure, which includes a first rotary reflection unit, a first parabolic reflection unit, and a second parabolic reflection unit; the first rotary reflection unit is used to reflect the test light to the first parabolic reflection unit or the second parabolic reflection unit; the first parabolic reflection unit is arranged on the incident light side of the solid-liquid detection structure and is used to converge the received test light and then reflect it into the solid-liquid detection structure; The second parabolic reflection unit is arranged on the incident light side of the gas detection structure and is used to converge the received test light and then reflect it into the gas detection structure; A second optical path adjustment structure, which includes a second rotary reflection unit, a third parabolic reflection unit, and a fourth parabolic reflection unit; the third parabolic reflection unit is arranged on the outgoing light side of the solid-liquid detection structure and is used to convert the outgoing light of the solid-liquid detection structure into parallel light and then reflect it to the second rotary reflection unit; the fourth parabolic reflection unit is arranged on the outgoing light side of the gas detection structure and is used to convert the outgoing light of the gas detection structure into parallel light and then reflect it to the second rotary reflection unit; the second rotary reflection unit is used to reflect the received outgoing light into the detection component.

2. The infrared spectrometer accessory according to claim 1, characterized in that, Both the first rotary reflection unit and the second rotary reflection unit include: A base; A motor arranged on the base; A first bracket arranged on the motor; A double-sided mirror arranged on the first bracket; The motor is used to drive the first bracket and the double-sided mirror to rotate.

3. The infrared spectrometer accessory according to claim 1, characterized in that, Both the first parabolic reflection unit, the second parabolic reflection unit, the third parabolic reflection unit, and the fourth parabolic reflection unit include: A second bracket; A parabolic mirror arranged on the second bracket.

4. The infrared spectrometer accessory according to claim 1, characterized in that, The first optical path adjustment structure further includes a first housing, and the first rotary reflection unit, the first parabolic reflection unit, and the second parabolic reflection unit are all arranged in the first housing; light incident holes allowing the test light to pass through are respectively arranged on the first housing at positions corresponding to the incident light directions of the solid-liquid detection structure and the gas detection structure; The second optical path adjustment structure further includes a second housing, and the second rotary reflection unit, the third parabolic reflection unit, and the fourth parabolic reflection unit are all arranged in the second housing; light outgoing holes allowing the outgoing light to pass through are respectively arranged on the second housing at positions corresponding to the outgoing light directions of the solid-liquid detection structure and the gas detection structure.

5. The infrared spectrometer accessory according to claim 1, characterized in that, The solid-liquid detection structure includes: a first plane mirror, a second plane mirror, an ATR crystal, and a press head; The first plane mirror is used to reflect the incident test light to the ATR crystal; A solid sample or a liquid sample to be tested is placed on the ATR crystal; The second plane mirror is used to reflect the light reflected from the contact surface between the ATR crystal and the solid sample or liquid sample to be tested into the second optical path adjustment structure; The indenter is disposed above the ATR crystal and is used to press the solid sample to be measured on the ATR crystal.

6. The infrared spectrometer accessory according to claim 1, characterized in that, The gas detection structure includes: a gas chamber provided with an air inlet and an air outlet; a first lens disposed near the light incident side of the gas chamber and used to converge the incident test light; a second lens disposed near the light exit side of the gas chamber and used to convert the converged light passing through the gas sample to be measured into parallel light and then transmit it to the second optical path adjustment structure.

7. An infrared spectrometer, characterized in that, It includes: a light source assembly for emitting test light; an infrared spectrometer accessory according to any one of claims 1 to 6, disposed on the light exit side of the light source assembly and used to perform infrared testing on a solid sample, a liquid sample or a gas sample by using the test light; a detection assembly disposed on the light exit side of the infrared spectrometer accessory and used to detect the light emitted by the infrared spectrometer accessory.

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