CN111707657A - Dual-wavelength laser confocal Raman probe and Raman spectrometer - Google Patents
Dual-wavelength laser confocal Raman probe and Raman spectrometer Download PDFInfo
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- CN111707657A CN111707657A CN202010686561.7A CN202010686561A CN111707657A CN 111707657 A CN111707657 A CN 111707657A CN 202010686561 A CN202010686561 A CN 202010686561A CN 111707657 A CN111707657 A CN 111707657A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The invention discloses a dual-wavelength laser confocal Raman probe and a Raman spectrometer, wherein the Raman probe comprises: a first laser module; the dual-wavelength coupling module comprises a coupling dichroic plate which can receive a first outgoing beam emitted by the first laser module at a first side and form a transmission beam at a second side, receive a second outgoing beam emitted by the second laser module at the second side and form a reflected beam which is in the same direction as the transmission beam at the second side; the coupling lens is positioned on the second side of the coupling dichroic sheet, and the main optical axis of the coupling lens is parallel to the first emergent light beam; the Raman probe and the Raman spectrometer can use the laser with two wavelengths to carry out confocal Raman excitation on a measured sample under the condition of keeping the Raman probe smaller in size, collect and carry out spectral analysis treatment on Raman scattering light of two wave bands emitted by the sample, and meet the requirement of a small Raman spectrometer on higher shock resistance.
Description
Technical Field
The invention relates to the technical field of optical instruments, in particular to a dual-wavelength laser confocal Raman probe and a Raman spectrometer.
Background
The detection of the substance components is a requirement widely existing in various industries, and the Raman spectrum detection technology can quickly obtain the component information of a sample within a few seconds due to no need of sample pretreatment, has a wider detectable range, and can detect most substances composed of molecules, so that the Raman spectrum detection technology has obvious advantages compared with other detection technologies, and is increasingly applied to the fields of food safety detection, medicine detection, drug detection, jewelry identification and the like; the Raman spectrum detection technology adopts laser to irradiate a sample, excites Raman scattering light of the sample, and performs spectral analysis on the Raman scattering light to obtain material component information of the detected sample; instrument manufacturers at home and abroad put forward various types of raman spectrum detectors, and besides large raman spectrometers for scientific research in laboratories, the raman spectrum detectors also have a plurality of portable or handheld small raman spectrum detectors which are applied to detection requirements of various industries.
The small-sized raman spectrometer generally comprises a laser module, a probe module, a spectrum analysis module and the like, and the modules are generally connected through optical fibers; the laser module is used for generating narrow linewidth laser with certain power and exciting Raman scattering light of a tested sample, and the laser wavelength is usually 785 nanometers, 532 nanometers, 830 nanometers and the like; the probe module is used for focusing and irradiating laser on a sample to be detected and collecting Raman scattering light emitted by the sample; the spectrum analysis module is used for carrying out spectrum analysis on the Raman scattering light to obtain Raman spectrum data information of the detected sample.
When the laser with different wavelengths is adopted to irradiate a sample, certain difference exists in optical signals emitted by the sample; on one hand, the intensity of Raman scattering light of the sample is inversely proportional to the fourth power of the laser wavelength, and the shorter the wavelength of the laser is, the higher the intensity of the Raman scattering light emitted by the sample is; on the other hand, some substances can emit stronger fluorescence signals when being irradiated by laser with short wavelength of 532 nm and the like, and when the fluorescence intensity is greater than the intensity of Raman scattered light, the Raman signals can be covered by the fluorescence signals, so that the detection of Raman spectrum is difficult; this requires that the raman spectroscopy detection be performed by selecting appropriate wavelengths of laser light for different substances.
The existing small-sized Raman spectrum detector usually only uses laser with one wavelength to carry out Raman spectrum detection on a sample, which brings certain limitation to the application of the small-sized Raman spectrum detector. At present, manufacturers abroad put forward a small-sized Raman spectrum detector integrated with two wavelengths of laser, but the two wavelengths of laser are respectively irradiated onto a sample from two Raman probes, which is equivalent to simply splicing the two Raman spectrum detectors with different wavelengths together, and the focus points of the two probes on the sample are difficult to adjust to the same position, so that the aim of detecting the double-wavelength laser confocal point of the detected sample cannot be achieved. Lasers with multiple wavelengths are often integrated in a large-scale Raman spectrometer used in a scientific research laboratory, but selective switching among lasers with different wavelengths is realized through a moving part, and meanwhile, the possibility of position change can occur in the switching process, so that errors in results are caused, and the moving part is not suitable for being applied to a small-scale Raman spectrometer with high shockproof requirements; there is therefore a need to find a solution to such problems.
Disclosure of Invention
In view of the above, at least one of the above defects in the prior art needs to be overcome, and the present invention provides a dual-wavelength laser confocal raman probe, which can realize a raman probe for dual-wavelength laser confocal detection, so that a small raman spectrum detector can also select laser wavelengths for different types of substances; the confocal raman probe of double wavelength laser includes: the first laser module is connected with the first laser module and the first spectrometer through a first transmission optical fiber and a first Raman transmission optical fiber respectively; the dual-wavelength coupling module comprises a coupling dichroic sheet which can receive a first outgoing beam emitted by the first laser module at a first side and form a transmission beam at a second side, receive a second outgoing beam emitted by the second laser module at the second side and form a reflected beam which is in the same direction as the transmission beam at the second side; and a coupling lens on the second side of the coupling dichroic plate, a principal optical axis of the coupling lens being parallel to the first outgoing light beam.
According to the background art, the existing small-sized raman spectrum detector generally uses only one wavelength of laser to perform raman spectrum detection on a sample; lasers with multiple wavelengths are often integrated in a large-scale Raman spectrometer, but selective switching between lasers with different wavelengths is realized through a moving part, and a lot of possibility of position change occurs in the switching process, so that errors in results are caused, and therefore the moving part is not suitable for being applied to a small-scale Raman spectrometer with high shockproof requirements; the invention discloses a dual-wavelength laser confocal Raman probe, wherein a first emergent light beam and a second emergent light beam with different wavelengths are combined into coaxial parallel light with two wavelengths through a coupling dichroic film, and are converged on the surface of a sample positioned at the focus of the coupling lens through the coupling lens to excite Raman scattering light of two wave bands of the sample, the Raman scattering light of the two wave bands is collected through the lens to be parallel light and is irradiated to the coupling dichroic film, the parallel light is decomposed into two parallel light beams with mutually vertical propagation directions through the coupling dichroic film, the two parallel light beams are respectively propagated to a first spectrometer and a second spectrometer through a first laser module and a second laser module to obtain the spectral information of the Raman scattering light of the two wave bands of the sample, so that the confocal Raman excitation of the measured sample by using the laser with the two wavelengths is realized under the condition of keeping the smaller volume of the Raman probe, and the Raman scattering light of two wave bands emitted by the sample is collected and subjected to spectral analysis, so that the defect that the small-sized Raman spectrum detector can only carry out Raman spectrum detection of one laser wavelength is overcome, the application range of the small-sized Raman spectrometer is expanded, and the detection is accurate.
Simultaneously, in the present case, according to the different properties of sample, choose to open one kind in two kinds of lasers and carry out raman spectroscopy to the sample and survey: for a sample with a fluorescence effect, laser with longer wavelength in two kinds of laser can be used, so that the interference of a fluorescence signal of the sample on a Raman signal is avoided; for a sample without a fluorescence effect, two lasers with shorter wavelengths in the two lasers can be used, so that a stronger Raman spectrum signal of the sample can be obtained, a moving part is not required to be switched, and the requirement of a small Raman spectrometer on higher shock resistance is met.
In addition, the dual-wavelength laser confocal Raman probe disclosed by the invention also has the following additional technical characteristics:
further, the coupling dichroic plate is a 45 ° dichroic plate.
Further, the second outgoing beam is perpendicular to the first outgoing beam.
Further, the first laser module comprises a first Raman filter set, a first collimating lens and a first focusing lens; the first set of Raman filters includes a first dichroic filter disposed on the first side of the coupling dichroic filter; the first collimating lens is arranged between one side of the first dichroic filter and the first laser transmission optical fiber; the first focusing lens is arranged between the other side of the first dichroic filter and the first Raman transmission optical fiber and is coaxial with the coupling lens.
Still further, the coupled dichroic patches are 45 ° dichroic patches; the first dichroic filter is a 45-degree dichroic filter, and the main axis of the first collimating lens is perpendicular to the main axis of the coupling lens.
Furthermore, the first raman filter set further includes a first laser narrowband filter and a first long-pass filter, and the first laser narrowband filter is disposed between the first collimating lens and the first dichroic filter; the first long-pass filter is arranged between the first dichroic filter and the first focusing lens.
Further, the second laser module comprises a second Raman filter set, a second collimating lens and a second focusing lens; the second set of raman filters includes a second dichroic plate disposed on the second side of the coupling dichroic plate; the second collimating lens is arranged between one side of the second dichroic sheet and the second laser transmission optical fiber; the second focusing lens is arranged between the other side of the second dichroic sheet and the second Raman transmission optical fiber.
Still further, the coupled dichroic patches are 45 ° dichroic patches; the second dichroic plate is a 45-degree dichroic plate, and the main axis of the second collimating lens is parallel to the main axis of the coupling lens; the principal axis of the second focusing lens is perpendicular to the principal axis of the coupling lens.
Furthermore, the second raman filter set further includes a second laser narrowband filter and a second long-pass filter, and the second laser narrowband filter is disposed between the second collimating lens and the second dichroic filter; the second long pass filter is disposed between the second dichroic filter and the second focusing lens.
According to another aspect of the present invention, there is provided a raman spectrometer based on the above two-wavelength laser confocal raman probe, including: the dual-wavelength laser confocal Raman probe; a laser module including a first laser connected to the first laser module through a first laser transmission fiber and a second laser connected to the second laser module through a second laser transmission fiber; and the spectrum analysis module comprises a first spectrometer connected with the first laser module through a first Raman transmission optical fiber and a second spectrometer connected with the second laser module through a second Raman transmission optical fiber.
In addition, the raman spectrometer disclosed by the invention also has the following additional technical characteristics:
further, the first laser and the second laser emit laser beams with different wavelengths, respectively.
Furthermore, one end of the first laser transmission optical fiber is connected with the first laser, and the end face of the other end of the first laser transmission optical fiber is located at the focal position of the first collimating lens; one end of the second laser transmission optical fiber is connected with the second laser, and the end face of the other end of the second laser transmission optical fiber is located at the focal position of the second collimating lens.
According to another aspect of the present invention, there is also provided a method for detecting a dual wavelength laser confocal point of a raman probe based on the raman spectrometer, comprising the following steps: a first outgoing beam emitted by the first laser module is transmitted through the coupling dichroic sheet to form a transmitted beam, a second outgoing beam emitted by the second laser module is reflected through the coupling dichroic sheet to form a reflected beam which is in the same direction as the transmitted beam, and the transmitted beam and the reflected beam are converged on a sample at the focus of the coupling lens through the coupling lens and excite Raman scattering light containing two wave bands; the Raman scattered light is collected by the coupling lens to form parallel Raman scattered light containing two wave bands and then passes through the coupling dichroic sheet, and the parallel Raman scattered light of a first wave band in the parallel Raman scattered light is transmitted by the coupling dichroic sheet to form transmitted Raman scattered light in the reverse direction of the first emergent light beam; reflecting the second band parallel Raman scattered light by the coupling dichroic sheet to form reflected Raman scattered light in a reverse direction of the second emergent beam; the transmission Raman scattering light is transmitted to a first spectrometer through the first laser module and the first Raman transmission optical fiber, and first Raman spectrum information is obtained through analysis of the first spectrometer; and the reflected Raman scattering light is transmitted to a second spectrometer through the second laser module and the second Raman transmission optical fiber, and second Raman spectrum information is obtained through analysis of the second spectrometer.
In addition, the method for detecting the double-wavelength laser confocal point of the Raman probe disclosed by the invention also has the following additional technical characteristics:
further, the coupling dichroic plate is a 45 ° dichroic plate.
Further, the first laser module comprises a first raman filter set, a first collimating lens and a first focusing lens, wherein the first raman filter set comprises a first dichroic filter, a first laser narrowband filter and a first long-pass filter; the method for the first laser module to emit the first emitted light beam comprises the following steps: the first laser emitted by the first laser passes through the first laser narrowband filter after being expanded and collimated by the first collimating lens, and then is reflected by the first dichroic filter to form the first emitted light beam.
Further, the method of propagating the transmitted raman scattered light to the first spectrometer comprises the steps of: the transmission Raman scattering light is transmitted by the first dichroic filter, then Rayleigh scattering is filtered by the first long-pass filter, and then the transmission Raman scattering light is converged to a first Raman transmission optical fiber by the first focusing lens and is transmitted to a first spectrometer by the first Raman transmission optical fiber.
Still further, the first dichroic filter is a 45 ° dichroic filter.
Further, the second laser module comprises a second raman filter set, a second collimating lens and a second focusing lens, wherein the second raman filter set comprises a second dichroic filter, a second laser narrow-band filter and a second long-pass filter; the method for the second laser module to emit the second emitted light beam comprises the following steps: and the second laser emitted by the second laser passes through the second laser narrow-band filter after being expanded and collimated by the second collimating lens, and is reflected by the second dichroic sheet to form a second emitted light beam.
Still further, the method of propagating the reflected raman scattered light to a second spectrometer comprises the steps of: and the reflected Raman scattered light is reflected by the second dichroic sheet, filtered by the second long-pass filter to remove Rayleigh scattering, converged to a second Raman transmission fiber by the second focusing lens, and transmitted to a second spectrometer by the second Raman transmission fiber.
Still further, the first dichroic filter is a 45 ° dichroic filter.
Further, the method for detecting the dual-wavelength laser confocal point of the raman probe further comprises a laser switching control module, and the laser switching control module can control to emit only the first emitted light beam or only the second emitted light beam or both the first emitted light beam and the second emitted light beam according to detection requirements.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a Raman spectrometer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first laser module according to one embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a second laser module according to an embodiment of the present invention; and
fig. 4 is a schematic structural diagram of a dual-wavelength coupling module according to an embodiment of the present invention.
The system comprises a sample A, a dual-wavelength coupling module B, a first laser module C, a second laser module D, a first laser, a first spectrometer F, a second laser, a second spectrometer H, a dual-wavelength laser confocal Raman probe I, a first collimating lens 1, a first laser narrow-band filter 2, a first dichroic filter 3, a first long-pass filter 4, a first focusing lens 5, a second collimating lens 6, a second laser narrow-band filter 7, a second dichroic filter 8, a second long-pass filter 9 and a second focusing lens 10, wherein the sample A is a sample; 11 is a coupling dichroic plate, and 12 is a coupling lens.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout; the embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "lateral", "vertical", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used only for convenience in describing the present invention and for simplification of description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The invention provides a dual-wavelength laser confocal Raman probe, a Raman spectrometer and a dual-wavelength laser confocal detection method, wherein a first emergent light beam and a second emergent light beam with different wavelengths are combined into coaxial parallel light with two wavelengths through a coupling dichroic film, the coaxial parallel light is converged on the surface of a sample positioned at the focus of a coupling lens through the coupling lens to excite Raman scattering light with two wave bands of the sample, the Raman scattering light with the two wave bands is collected into parallel light through the lens and then irradiated to the coupling dichroic film, the parallel light is decomposed into two parallel lights with mutually vertical propagation directions by the coupling dichroic film, the two parallel lights are respectively propagated to the first spectrometer and the second spectrometer through a first laser module and a second laser module to obtain spectral information of the Raman scattering light with the two wave bands of the sample, so that under the condition of keeping the Raman probe smaller volume, the confocal Raman excitation can be carried out on the tested sample by using the laser with two wavelengths, and the Raman scattering light of two wave bands emitted by the sample is collected and subjected to spectral analysis processing, so that the defect that the small-sized Raman spectrum detector can only carry out the Raman spectrum detection with one laser wavelength is overcome, the application range of the small-sized Raman spectrometer is expanded, and the detection is accurate.
Simultaneously, in the present case, according to the different properties of sample, choose to open one kind in two kinds of lasers and carry out raman spectroscopy to the sample and survey: for a sample with a fluorescence effect, laser with longer wavelength in two kinds of laser can be used, so that the interference of a fluorescence signal of the sample on a Raman signal is avoided; for a sample without a fluorescence effect, two lasers with shorter wavelengths in the two lasers can be used, so that a stronger Raman spectrum signal of the sample can be obtained, a moving part is not required to be switched, and the requirement of a small Raman spectrometer on higher shock resistance is met.
FIG. 1 is a block diagram of a Raman spectrometer according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a first laser module according to one embodiment of the present disclosure; FIG. 3 is a schematic diagram of a second laser module according to an embodiment of the present invention; fig. 4 is a schematic structural diagram of a dual-wavelength coupling module in an embodiment of the invention.
As shown in fig. 1 to 4, according to an embodiment of the present invention, a two-wavelength laser confocal raman probe I includes: the first laser module C is connected with the first laser module C and the first spectrometer F through a first transmission optical fiber and a first Raman transmission optical fiber respectively; the double-wavelength coupling module B comprises a coupling dichroic plate 11 which can receive a first emergent beam emitted by the first laser module C on a first side and form a transmission beam on a second side, receive a second emergent beam emitted by the second laser module D on the second side and form a reflected beam which is in the same direction as the transmission beam on the second side; and a coupling lens 12, wherein the coupling lens 12 is located on the second side of the coupling dichroic plate 11, and a principal optical axis of the coupling lens 12 is parallel to the first outgoing light beam.
According to the background art, the existing small-sized raman spectroscopy detector usually uses only one wavelength of laser to perform raman spectroscopy detection on a sample a; lasers with multiple wavelengths are often integrated in a large-scale Raman spectrometer, but selective switching between lasers with different wavelengths is realized through a moving part, and a lot of possibility of position change occurs in the switching process, so that errors in results are caused, and therefore the moving part is not suitable for being applied to a small-scale Raman spectrometer with high shockproof requirements; in the dual-wavelength laser confocal raman probe I disclosed by the invention, the first outgoing beam and the second outgoing beam with different wavelengths are combined into coaxial parallel light with two wavelengths through the coupling dichroic filter 11, and then are converged on the surface of the sample a at the focus of the coupling lens 12 through the coupling lens 12 to excite raman scattering light of two wave bands of the sample a, the raman scattering light of the two wave bands is collected by the lens to be parallel light and irradiated to the coupling dichroic filter 11, and then is decomposed into two parallel light beams with mutually perpendicular propagation directions by the coupling dichroic filter 11, the two parallel light beams are respectively propagated to the first spectrometer F and the second spectrometer H through the first laser module C and the second laser module D to obtain the spectrum information of the raman scattering light of the two wave bands of the sample a, so that under the condition of keeping the raman probe with a smaller volume, the laser with two wavelengths can be used for confocal Raman excitation of a detected sample A, and Raman scattering light of two wave bands emitted by the sample A is collected and subjected to spectral analysis, so that the defect that a small Raman spectrum detector can only perform Raman spectrum detection with one laser wavelength is overcome, the application range of the small Raman spectrometer is expanded, and the detection is accurate.
Simultaneously, in the present case, according to the different properties of sample A, choose to open one kind in two kinds of lasers and carry out raman spectroscopy to sample A and survey: for the sample A with the fluorescence effect, the laser with longer wavelength in the two lasers can be used, so that the interference of the fluorescence signal of the sample A on the Raman signal is avoided; for a sample A without a fluorescence effect, two lasers with shorter wavelengths in the two lasers can be used, so that a stronger Raman spectrum signal of the sample A can be obtained, a moving part is not required to be switched, and the requirement of a small Raman spectrometer on higher shock resistance is met.
In addition, the dual-wavelength laser confocal Raman probe disclosed by the invention also has the following additional technical characteristics:
according to one embodiment of the present invention, the coupling dichroic plate 11 is a 45 ° dichroic plate.
According to one embodiment of the invention, the second outgoing beam is perpendicular to the first outgoing beam.
According to one embodiment of the invention, the first laser module C comprises a first raman filter set, a first collimating lens 1 and a first focusing lens 5; the first set of raman filters comprises a first dichroic filter 3, the first dichroic filter 3 being disposed on the first side of the coupling dichroic filter 11; the first collimating lens 1 is arranged between one side of the first dichroic filter 3 and the first laser transmission optical fiber; the first focusing lens 5 is disposed between the other side of the first dichroic filter 3 and the first raman transmission fiber, and the first focusing lens 5 is coaxial with the coupling lens 12, as shown in fig. 2.
According to one embodiment of the present invention, the coupling dichroic plate 11 is a 45 ° dichroic plate; the first dichroic filter 3 is a 45 ° dichroic filter, and the major axis of the first collimating lens 1 is perpendicular to the major axis of the coupling lens 12, as shown in fig. 2 and 4.
According to one embodiment of the present invention, the first raman filter set further comprises a first laser narrowband filter 2 and a first long pass filter 4, the first laser narrowband filter 2 is disposed between the first collimating lens 1 and the first dichroic filter 3; the first long pass filter 4 is disposed between the first dichroic filter 3 and the first focusing lens 5, as shown in fig. 2.
According to one embodiment of the present invention, the second laser module D includes a second raman filter set, a second collimating lens 6, and a second focusing lens 10; the second raman filter set comprises a second dichroic plate 8, the second dichroic plate 8 being disposed on the second side of the coupling dichroic plate 11; the second collimating lens 6 is arranged between one side of the second dichroic sheet 8 and the second laser transmission optical fiber; the second focusing lens 10 is disposed between the other side of the second dichroic plate 8 and the second raman transmission fiber, as shown in fig. 3.
According to one embodiment of the present invention, the coupling dichroic plate 11 is a 45 ° dichroic plate; the second dichroic plate 8 is a 45 ° dichroic plate, and the principal axis of the second collimating lens 6 is parallel to the principal axis of the coupling lens 12; the principal axis of the second focusing lens 10 is perpendicular to the principal axis of the coupling lens 12, as shown in fig. 3 and 4.
According to an embodiment of the present invention, the second raman filter set further includes a second laser narrowband filter 7 and a second long pass filter 9, the second laser narrowband filter 7 is disposed between the second collimating lens 6 and the second dichroic filter 8; the second long pass filter 9 is placed between the second dichroic filter 8 and the second focusing lens 10, as shown in fig. 3.
As shown in fig. 1, according to another aspect of the present invention, there is also provided a raman spectrometer based on the above two-wavelength laser confocal raman probe I, including: the dual-wavelength laser confocal Raman probe I; a laser module comprising a first laser E connected to the first laser module C via a first laser transmission fiber and a second laser G connected to the second laser module D via a second laser transmission fiber; and the spectrum analysis module comprises a first spectrometer F connected with the first laser module C through a first Raman transmission optical fiber and a second spectrometer H connected with the second laser module D through a second Raman transmission optical fiber.
In addition, the raman spectrometer disclosed by the invention also has the following additional technical characteristics:
according to an embodiment of the present invention, the first laser E and the second laser G emit laser beams having different wavelengths, respectively.
According to one embodiment of the present invention, one end of the first laser transmission fiber is connected to the first laser E, and the end face of the other end is located at the focal position of the first collimating lens 1; one end of the second laser transmission fiber is connected with the second laser G, and the end face of the other end is located at the focal position of the second collimating lens 6.
As shown in fig. 1-4, according to another aspect of the present invention, there is also provided a method for detecting a dual wavelength laser confocal point of a raman probe based on the above raman spectrometer, comprising the following steps: a first outgoing beam emitted by the first laser module C is transmitted through the coupling dichroic plate 11 to form a transmitted beam, a second outgoing beam emitted by the second laser module D is reflected through the coupling dichroic plate 11 to form a reflected beam which is in the same direction as the transmitted beam, and the transmitted beam and the reflected beam are converged on a sample A at the focus of the coupling lens 12 through the coupling lens 12 and excite Raman scattering light containing two wavebands; the Raman scattered light is collected by the coupling lens 12 to form parallel Raman scattered light containing two wave bands and then passes through the coupling dichroic plate 11, and the first wave band parallel Raman scattered light in the parallel Raman scattered light is transmitted by the coupling dichroic plate 11 to form transmitted Raman scattered light in the opposite direction of the first emergent light beam; the second band parallel raman scattered light is reflected by the coupling dichroic plate 11 to form reflected raman scattered light in the reverse direction of the second emitted light beam; the transmission Raman scattering light is transmitted to a first spectrometer F through the first laser module C and the first Raman transmission optical fiber, and first Raman spectrum information is obtained through analysis of the first spectrometer F; and the reflected Raman scattering light is transmitted to a second spectrometer H through the second laser module D and a second Raman transmission optical fiber, and second Raman spectrum information is obtained through analysis of the second spectrometer H.
In addition, the method for detecting the double-wavelength laser confocal point of the Raman probe disclosed by the invention also has the following additional technical characteristics:
according to one embodiment of the present invention, the coupling dichroic plate 11 is a 45 ° dichroic plate.
According to one embodiment of the present invention, the first laser module C comprises a first raman filter set comprising a first dichroic filter 3, a first laser narrowband filter 2 and a first long pass filter 4, a first collimating lens 1 and a first focusing lens 5; the method of the first laser module C emitting the first emitted beam comprises the steps of: the first laser beam emitted by the first laser E is expanded and collimated by the first collimating lens 1, passes through the first laser narrowband filter 2 to filter stray light with other wavelengths in the laser beam, and is reflected by the first dichroic filter 3 to form the first emitted light beam, as shown in fig. 2.
According to an embodiment of the invention, the method of propagating the transmitted raman scattered light to the first spectrometer F comprises the steps of: the transmission raman scattering light is transmitted by the first dichroic filter 3, filtered by the first long pass filter 4 to remove rayleigh scattering, converged to a first raman transmission fiber by the first focusing lens 5, and transmitted to a first spectrometer F through the first raman transmission fiber, as shown in fig. 2.
According to one embodiment of the invention, the first dichroic filter 3 is a 45 ° dichroic filter.
According to one embodiment of the invention, the second laser module D comprises a second raman filter set comprising a second dichroic filter 8, a second laser narrowband filter 7 and a second long pass filter 9, a second collimating lens 6 and a second focusing lens 10; the method for emitting the second emitted light beam by the second laser module D comprises the following steps: the second laser light emitted from the second laser G is expanded and collimated by the second collimating lens 6, passes through the second laser narrowband filter 7 to filter out stray light with other wavelengths in the laser beam, and is reflected by the second dichroic filter 8 to form the second emitted light beam, as shown in fig. 3.
According to an embodiment of the invention, the method of propagating the reflected raman scattered light to the second spectrometer H comprises the steps of: the reflected raman scattered light is reflected by the second dichroic plate 8, filtered by the second long pass filter 9 to remove rayleigh scattering, converged to a second raman transmission fiber by the second focusing lens 10, and transmitted to a second spectrometer H through the second raman transmission fiber, as shown in fig. 3.
According to one embodiment of the invention, the first dichroic filter 3 is a 45 ° dichroic filter.
According to an embodiment of the invention, the method for detecting the dual-wavelength laser confocal point of the raman probe further comprises a laser switching control module, and the laser switching control module can control to emit only the first outgoing beam or only the second outgoing beam or both the first outgoing beam and the second outgoing beam according to detection requirements.
According to one embodiment of the present invention, the opening and closing of the first laser E and the second laser G is controlled by the laser switching control module.
Any reference to "one embodiment," "an embodiment," "example embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention; the schematic representations in various places in the specification do not necessarily refer to the same embodiment; further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.
While specific embodiments of the invention have been described in detail with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention; in particular, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the appended claims without departing from the spirit of the invention; except variations and modifications in the component parts and/or arrangements, the scope of which is defined by the appended claims and equivalents thereof.
Claims (10)
1. A dual wavelength laser confocal raman probe, comprising:
a first laser module;
a second laser module, and
the dual-wavelength coupling module comprises a coupling dichroic plate which can receive a first outgoing beam emitted by the first laser module on a first side and form a transmission beam on a second side, receive a second outgoing beam emitted by the second laser module on the second side and form a reflected beam which is co-directional with the transmission beam on the second side; and a coupling lens on the second side of the coupling dichroic plate, a principal optical axis of the coupling lens being parallel to the first outgoing light beam.
2. The dual wavelength laser confocal raman probe of claim 1, wherein the coupling dichroic plate is a 45 ° dichroic plate.
3. The dual wavelength laser confocal raman probe of claim 2, wherein the second exit beam is perpendicular to the first exit beam.
4. The dual wavelength laser confocal raman probe of claim 1, wherein the first laser module comprises a first raman filter set, a first collimating lens, and a first focusing lens; the first set of Raman filters includes a first dichroic filter disposed on the first side of the coupling dichroic filter; the first collimating lens is arranged between one side of the first dichroic filter and the first laser transmission optical fiber; the first focusing lens is arranged between the other side of the first dichroic filter and the first Raman transmission optical fiber.
5. The dual wavelength laser confocal raman probe of claim 4, wherein the first dichroic plate is a 45 ° dichroic plate.
6. The dual wavelength laser confocal raman probe of claim 4, wherein the first raman filter set further comprises a first laser narrowband filter and a first long pass filter, the first laser narrowband filter being disposed between the first collimating lens and the first dichroic filter; the first long-pass filter is arranged between the first dichroic filter and the first focusing lens.
7. The dual wavelength laser confocal raman probe of claim 1, wherein the second laser module comprises a second raman filter set, a second collimating lens, and a second focusing lens; the second set of raman filters includes a second dichroic plate disposed on the second side of the coupling dichroic plate; the second collimating lens is arranged between one side of the second dichroic sheet and the second laser transmission optical fiber; the second focusing lens is arranged between the other side of the second dichroic sheet and the second Raman transmission optical fiber.
8. The dual wavelength laser confocal raman probe of claim 7, wherein the second dichroic plate is a 45 ° dichroic plate.
9. The dual wavelength laser confocal raman probe of claim 7, wherein the second raman filter set further comprises a second laser narrowband filter and a second long pass filter, the second laser narrowband filter being disposed between the second collimating lens and the second dichroic plate; the second long pass filter is disposed between the second dichroic filter and the second focusing lens.
10. A raman spectrometer, comprising: the dual wavelength laser confocal raman probe of any one of claims 1 to 9; a laser module including a first laser connected to the first laser module through a first laser transmission fiber and a second laser connected to the second laser module through a second laser transmission fiber; and the spectrum analysis module comprises a first spectrometer connected with the first laser module through a first Raman transmission optical fiber and a second spectrometer connected with the second laser module through a second Raman transmission optical fiber.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115096779A (en) * | 2022-08-26 | 2022-09-23 | 苏州同人激光科技有限公司 | Vehicle-mounted gas quality detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115096779A (en) * | 2022-08-26 | 2022-09-23 | 苏州同人激光科技有限公司 | Vehicle-mounted gas quality detection system |
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