CN219552251U - Terahertz optical fiber spectrometer optical transmission assembly, small detection probe and system - Google Patents
Terahertz optical fiber spectrometer optical transmission assembly, small detection probe and system Download PDFInfo
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- CN219552251U CN219552251U CN202223422154.9U CN202223422154U CN219552251U CN 219552251 U CN219552251 U CN 219552251U CN 202223422154 U CN202223422154 U CN 202223422154U CN 219552251 U CN219552251 U CN 219552251U
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Abstract
The utility model discloses an optical transmission assembly of a terahertz optical fiber spectrometer, which comprises a transmitting end, a receiving end and a detection light path connecting the transmitting end and the receiving end, wherein the detection light path comprises a linear input light path and a bent output light path, the input light path starts from the transmitting end and sequentially passes through an input mirror, a light splitting device and a detection focusing lens to reach a detection surface, the output light path returns from the detection surface and sequentially passes through the detection focusing lens, the light splitting device and the output mirror, the output light path is received by the receiving end, and the input light path and the output light path are overlapped at least between the light splitting device and the detection surface; a terahertz optical fiber spectrometer small-sized detection probe comprises a box-shaped shell, a transmitting assembly and a receiving assembly; a terahertz optical fiber spectrometer detection system comprises an adjustable supporting mechanism and a ranging mechanism. The utility model optimizes the light path and reduces the volume of the equipment; the required optical devices are simplified, and the cost is reduced; the overall stability of the equipment is improved, and errors are reduced.
Description
Technical Field
The utility model relates to the field of terahertz fiber spectrometers, in particular to an optical transmission assembly, a small detection probe and a system of a terahertz fiber spectrometer.
Background
Terahertz waves are a special frequency band between infrared and millimeter waves, and are usually at frequencies of 0.1THz to 10THz (1 thz=10 12 Hz). Terahertz waves are relatively specific in the location of the electromagnetic spectrum, resulting in many unique properties. The vibration and rotation energy levels of macromolecules are mostly in terahertz wave bands, and macromolecules, particularly biological and chemical macromolecules, have substance groups which show physical properties, so that the terahertz optical fiber spectrometer can acquire the substance structure and physical properties of a sample through analysis of characteristic frequencies, and analyze and accurately identify the sample. In a terahertz spectrometer detection system, an optical fiber femtosecond laser emits two beams of femtosecond laser, one beam is used as pump light, and the other beam is used as detection light; the pumping light is transmitted to the transmitting antenna through the optical fiber, terahertz waves are generated under the action of bias voltage, the terahertz waves are transmitted and/or reflected to carry information of a sample to be detected, the information is received by the terahertz detector, and physical information such as refractive index, absorption coefficient, dielectric constant and the like of the sample can be obtained through a spectrum analysis technology. The waveform of the detection result of the sample is measured by changing the optical path difference of the pump light and the probe light of the terahertz pulse electric field intensity at different times across the sample using a delay device.
The traditional free space terahertz spectrometer is suitable for laboratories, has larger construction space, has the defects of inconvenient movement, high detection cost and inconvenient operation, and cannot meet the requirements of actual production. The optical adjusting frame is generally adopted for assembly, a spring is arranged on the optical adjusting frame, the stability of the optical adjusting frame is poor along with the time, the deviation of a detection result is easy to occur, and the optical adjusting frame needs to be adjusted by experienced technicians, so that the problem of long-term after-sales is caused. Therefore, there is a need for a terahertz fiber spectrometer detection device that is smaller in size, convenient to move, and more stable in internal structure.
Disclosure of Invention
The utility model aims to overcome at least one defect (deficiency) of the prior art, and provides an optical transmission assembly, a small detection probe and a system of a terahertz optical fiber spectrometer, which are used for solving the problems of large volume and inconvenient movement of the existing terahertz optical fiber spectrometer.
The technical scheme adopted by the utility model is that the terahertz optical fiber spectrometer optical transmission assembly comprises a transmitting end, a receiving end and a detection light path connecting the transmitting end and the receiving end, wherein the transmitting end and the receiving end are arranged on the same side, the detection light path comprises an input light path in a straight line and a bent output light path, the input light path starts from the transmitting end, sequentially passes through an input mirror, a light splitting device and a detection focusing lens to reach a detection surface, and the output light path returns from the detection surface, sequentially passes through the detection focusing lens, the light splitting device and the output mirror and is received by the receiving end; the light splitting device is used for transmitting and reflecting light beams, and the input light path and the output light path are overlapped at least between the light splitting device and the detection surface. The detection focusing lens plays a role in focusing terahertz waves, is favorable for focusing terahertz wave energy, and enhances signals reflected by the detection surface, wherein the detection surface is the surface of a sample. The detection light path is further optimized and distributed reasonably; the required optical devices are simplified, the optical path is shortened, and the occupied volume of the optical transmission assembly of the terahertz optical fiber spectrometer is reduced.
Further, the input mirror is an input focusing lens, and the output mirror is a parabolic mirror. The input focusing lens plays a role in focusing terahertz waves, the terahertz waves emitted from the emission end are divergent beams, and the divergent beams are changed into parallel beams through the focusing effect of the input focusing lens; the parabolic mirror can simultaneously focus terahertz waves, change the direction of the terahertz waves and bend an output light path. Fewer optical devices are used, the loss of terahertz waves is reduced, and a detection light path is reasonably optimized.
Further, the light splitting device is a light splitting sheet, the light splitting sheet is provided with a transmission surface and a reflection surface, the transmission surface is opposite to the input focusing lens, and the reflection surface is opposite to the parabolic mirror and the detection focusing lens; the input optical path passes through the transmissive surface and the output optical path changes direction at the reflective surface. The splitting ratio of the beam splitter is 5:5, terahertz waves are split into two beams on the transmission surface, one beam passes through the transmission surface and the detection focusing lens to reach the detection surface, and the other beam is lost after being reflected. The transmission of the input light path and the reflection of the output light path occur in the same light splitting sheet, so that required optical devices are reduced, the detection light path is further compressed, and the occupied volume of the optical transmission assembly of the terahertz optical fiber spectrometer is reduced.
Furthermore, the positions of the reflecting surfaces of the parabolic mirror and the light splitting sheet are matched, so that part of the output light path from the parabolic mirror to the receiving end is parallel to the linear input light path, the detection light paths are prevented from being staggered in space, and the occupied volume of the optical transmission assembly of the terahertz optical fiber spectrometer is further reduced.
Further, the input focusing lens, the beam splitter, the detection focusing lens and the parabolic mirror are all arranged in a mounting structure, and the mounting structure is provided with a plurality of optical device mounting fixing positions and mounting holes, so that clamping (clamping, fixing) and adjustment of various optical components are mainly solved; through the screw reinforcement, can improve holistic stability, reduce the error.
The utility model provides a small-size test probe of terahertz fiber spectrometer, includes box-shaped casing, emission subassembly and receiving subassembly, still includes foretell terahertz fiber spectrometer optical transmission subassembly, terahertz fiber spectrometer optical transmission subassembly sets up in the casing, emission subassembly and receiving subassembly set up in the rear end face of casing and connect emission end and receiving end respectively. The whole appearance is more regular, and the movement is convenient; the transmitting assembly and the receiving assembly are arranged on the rear end face of the shell, so that the connection of external wires and optical fibers is facilitated, and meanwhile, the adjustment of the transmitting assembly and the receiving assembly is facilitated.
Further, the shell is provided with a detection port, the detection port is arranged on the front end face of the shell, the detection focusing lens is arranged in the detection port, and the detection port is opposite to the detection surface. The arrangement is that a part of the overlapped input light path and output light path are arranged outside the shell, and the volume is reduced under the condition of reducing deviation of detection results as much as possible.
Further, a first photoconductive antenna is arranged in the transmitting assembly; and a second photoconductive antenna is arranged in the receiving assembly, and a silicon lens is arranged between the second photoconductive antenna and the output light path. Under the action of bias voltage and femtosecond laser, the first photoconductive antenna generates terahertz waves. The terahertz wave carrying the sample information reaches the second photoconductive antenna, is focused on a chip of the second photoconductive antenna through a silicon lens, converts a terahertz spectrum signal into a current signal under the action of femtosecond laser, and converts the current signal into a terahertz voltage signal after being processed by a preamplifier and a phase-locked amplifier.
The terahertz optical fiber spectrometer detection system comprises the terahertz optical fiber spectrometer small detection probe, an adjustable supporting mechanism and a distance measuring mechanism, wherein the terahertz optical fiber spectrometer small detection probe is arranged on the adjustable supporting mechanism, and the adjustable supporting mechanism supports a shell and adjusts the distance between a sample and a detection port; the distance measuring mechanism is used for measuring the distance between the sample and the detection port. The adjustable supporting mechanism and the distance measuring mechanism can be a mechanical arm and a distance measuring instrument, the small terahertz fiber spectrometer detection probe is arranged on the mechanical arm to move, and the distance between the small terahertz fiber spectrometer detection probe and a sample is accurately measured through the distance measuring instrument; the small-size detection probe of the terahertz optical fiber spectrometer can also be a bracket and an electric sliding table, the small-size detection probe of the terahertz optical fiber spectrometer is installed on the bracket of the assembly line, and the distance between the small-size detection probe of the terahertz optical fiber spectrometer and a sample is accurately adjusted through the electric sliding table.
Further, the terahertz fiber spectrometer detection system is provided with a laser, a laser beam splitter, a first coupler, a second coupler and an optical delay component; the laser generates femtosecond laser, the laser beam splitter divides the femtosecond laser into pump light and detection light, the first coupler couples the pump light into a first photoconductive antenna of the emission component, the second coupler couples the detection light passing through the optical delay component into a second photoconductive antenna of the receiving component, and the optical delay component is used for changing the optical path of the detection light. The small-sized detection probe of the terahertz optical fiber spectrometer is small in size and convenient to move, other components in a detection system of the terahertz optical fiber spectrometer are not required to be moved during use, the terahertz optical fiber spectrometer is flexible and convenient, the practicability is high, and the actual production requirements can be met.
Compared with the prior art, the utility model has the beneficial effects that: the optical path is optimized, the optical path is shortened, and the volume of a small detection probe of the terahertz optical fiber spectrometer is reduced; the required optical devices are simplified, and the cost is reduced; the stability of the whole equipment is improved, and errors are reduced; flexible, convenient and high in practicability, can meet actual production requirements and is beneficial to industrialized application of products.
Drawings
Fig. 1 is a schematic structural diagram of an optical transmission assembly of a terahertz fiber optic spectrometer in the present utility model.
Fig. 2 is a perspective view of a small-sized detection probe of a terahertz fiber spectrometer in the utility model.
Fig. 3 is an exploded view of the small-sized detection probe of the terahertz fiber optic spectrometer in the present utility model.
Fig. 4 is a schematic structural diagram of a terahertz fiber spectrometer detection system in the present utility model.
The attached drawings are used for identifying and describing: the optical delay device comprises a shell 010, a front end face 011, a rear end face 012, an input optical path 021, an output optical path 022, a transmitting component 030, a transmitting end 031, a receiving component 040, a receiving end 041, an input focusing lens 050, a light splitting sheet 060, a transmitting surface 061, a reflecting surface 062, a detection focusing lens 070, a parabolic mirror 080, a laser 090, a laser beam splitter 100, a first coupler 110, a second coupler 120, an optical delay component 130 and a detection surface 140.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the utility model. For better illustration of the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1, in this embodiment, an optical transmission component of a terahertz fiber spectrometer includes a transmitting end 031 and a receiving end 041, and a detection optical path connecting the transmitting end 031 and the receiving end 041, where the transmitting end 031 and the receiving end 041 are disposed on the same side, the detection optical path includes an input optical path 021 and a bent output optical path 022, the input optical path 021 starts from the transmitting end 031, sequentially passes through an input mirror, a light splitting device and a detection focusing lens 070 to reach a detection surface 140, and the output optical path 022 returns from the detection surface 140, sequentially passes through a detection focusing lens 070, a light splitting device and an output mirror, and is received by the receiving end 041; the beam splitting device transmits and reflects the light beam, and the input optical path 021 and the output optical path 022 coincide at least between the beam splitting device and the detection face 140. The detection focusing lens 070 plays a role in focusing terahertz waves, is favorable for focusing terahertz wave energy, enhances signals reflected by the detection surface 140, and the detection surface 140 is the surface of a sample. The detection light path is further optimized and the layout is reasonable; the required optical devices are simplified, the optical path is shortened, and the occupied volume of the optical transmission assembly of the terahertz optical fiber spectrometer is reduced.
As shown in fig. 3, in this embodiment, the input mirror is an input focusing lens 050, and the output mirror is a parabolic mirror 080. The input focusing lens 050 plays a role in focusing terahertz waves, the terahertz waves emitted from the emission end 031 are divergent beams, and the divergent beams are changed into parallel beams through the focusing effect of the input focusing lens 050; the parabolic mirror 080 can simultaneously play roles in focusing terahertz waves, changing the direction of the terahertz waves and bending the output light path 022. Fewer optical devices are used, the loss of terahertz waves is reduced, and a detection light path is reasonably optimized.
As shown in fig. 3, in this embodiment, the light-splitting device is a light-splitting device 060, where the light-splitting device 060 has a transmission surface 061 and a reflection surface 062, the transmission surface 061 is opposite to the input focusing lens 050, and the reflection surface 062 is opposite to a parabolic mirror 080 and a detection focusing lens 070; the input optical path 021 passes through the transmissive surface 061 and the output optical path 022 changes direction at the reflective surface 062. The splitting ratio of the splitting optical sheet 060 is 5:5, the terahertz wave is split into two beams on the transmission surface 061, one beam passes through the transmission surface 061 and the detection focusing lens 070 to reach the detection surface 140, and the other beam is lost after being reflected. The transmission of the input optical path 021 and the reflection of the output optical path 022 occur in the same light splitting sheet 060, so that required optical devices are reduced, a detection optical path is further compressed, and the occupied volume of an optical transmission assembly of the terahertz optical fiber spectrometer is reduced.
As shown in fig. 1, in this embodiment, the position of the parabolic mirror 080 is matched with the position of the reflective surface 062 of the light splitting sheet 060, so that a part of the output optical path 022 from the parabolic mirror 080 to the receiving end 041 is parallel to the linear input optical path 021, so that the interleaving of detection optical paths in space is avoided, and the occupied volume of the optical transmission assembly of the terahertz fiber spectrometer is further reduced.
As shown in fig. 3, in this embodiment, the input focusing lens 050, the light splitting sheet 060, the detection focusing lens 070 and the parabolic mirror 080 are all arranged in a mounting structure, and the mounting structure is provided with a plurality of optical device mounting fixing positions and mounting holes, so that clamping (clamping, fixing) and adjustment of various optical components are mainly solved; through the screw reinforcement, can improve holistic stability, reduce the error.
As shown in fig. 3, in this embodiment, a small-sized detection probe of a terahertz fiber spectrometer includes a box-shaped housing 010, a transmitting assembly 030 and a receiving assembly 040, and further includes the above-mentioned terahertz fiber spectrometer optical transmission assembly, the terahertz fiber spectrometer optical transmission assembly is disposed in the housing 010, and the transmitting assembly 030 and the receiving assembly 040 are disposed in a rear end face 012 of the housing 010 and are respectively connected with the transmitting end 031 and the receiving end 041. The whole appearance is more regular, and the movement is convenient; the emitting unit 030 and the receiving unit 040 are provided at the rear end face 012 of the case 010, so that external electric wires and optical fibers can be easily connected, and the emitting unit 030 and the receiving unit 040 can be easily adjusted.
As shown in fig. 3, in the present embodiment, the housing 010 is provided with a detection port provided in a front end face 011 of the housing 010, and the detection focusing lens 070 is provided in the detection port, the detection port facing the detection surface 140. In this arrangement, a part of the overlapped input optical path 021 and output optical path 022 is placed outside the case 010, and the volume is reduced while minimizing the deviation of the detection result.
In this embodiment, a first photoconductive antenna (not shown) is disposed within the emission assembly 030; a second photoconductive antenna (not shown) is disposed within the receiving assembly 040, and a silicon lens (not shown) is disposed between the second photoconductive antenna and the output optical path 022. Under the action of bias voltage and femtosecond laser, the first photoconductive antenna generates terahertz waves. The terahertz wave carrying the sample information reaches the second photoconductive antenna, is focused on a chip of the second photoconductive antenna through a silicon lens, converts a terahertz spectrum signal into a current signal under the action of femtosecond laser, and converts the current signal into a terahertz voltage signal after being processed by a preamplifier and a phase-locked amplifier.
In this embodiment, a terahertz fiber spectrometer detection system includes the foregoing small terahertz fiber spectrometer detection probe, and further includes an adjustable support mechanism (not shown) and a ranging mechanism (not shown), where the small terahertz fiber spectrometer detection probe is disposed on the adjustable support mechanism, and the adjustable support mechanism supports the housing 010 and adjusts the distance between the sample and the detection port; the distance measuring mechanism is used for measuring the distance between the sample and the detection port. The adjustable supporting mechanism and the distance measuring mechanism can be a mechanical arm and a distance measuring instrument, the terahertz optical fiber spectrometer small-sized detection probe is arranged on the mechanical arm to move, and the distance between the terahertz optical fiber spectrometer small-sized detection probe and a sample is accurately measured through the distance measuring instrument; the small-size detection probe of the terahertz optical fiber spectrometer can also be a bracket and an electric sliding table, the small-size detection probe of the terahertz optical fiber spectrometer is installed on the bracket of the assembly line, and the distance between the small-size detection probe of the terahertz optical fiber spectrometer and a sample is accurately adjusted through the electric sliding table.
As shown in fig. 4, in the present embodiment, the terahertz fiber spectrometer detection system is provided with a laser 090, a laser beam splitter 100, a first coupler 110, a second coupler 120, and an optical delay assembly 130; the laser 090 generates a femtosecond laser, the laser beam splitter 100 splits the femtosecond laser into a pumping light and a probe light, the first coupler 110 couples the pumping light into a first photoconductive antenna of the emission unit 030, the second coupler 120 couples the probe light passing through the optical delay unit 130 into a second photoconductive antenna of the receiving unit 040, and the optical delay unit 130 is used to change an optical path length of the probe light. The small-sized detection probe of the terahertz optical fiber spectrometer is small in size and convenient to move, other components in a detection system of the terahertz optical fiber spectrometer do not need to be moved during use, and the terahertz optical fiber spectrometer detection system is flexible, convenient, high in practicality and capable of meeting actual production requirements.
It should be understood that the foregoing examples of the present utility model are merely illustrative of the present utility model and are not intended to limit the present utility model to the specific embodiments thereof. Any modification, equivalent replacement, improvement, etc. that comes within the spirit and principle of the claims of the present utility model should be included in the protection scope of the claims of the present utility model.
Claims (10)
1. The terahertz optical fiber spectrometer optical transmission assembly comprises a transmitting end, a receiving end and a detection light path connecting the transmitting end and the receiving end, and is characterized in that the transmitting end and the receiving end are arranged on the same side, the detection light path comprises an input light path and a bent output light path, the input light path starts from the transmitting end, sequentially passes through an input mirror, a light splitting device and a detection focusing lens to reach a detection surface, and the output light path returns from the detection surface, sequentially passes through the detection focusing lens, the light splitting device and an output mirror and is received by the receiving end; the light splitting device is used for transmitting and reflecting light beams, and the input light path and the output light path are overlapped at least between the light splitting device and the detection surface.
2. The terahertz fiber optic spectrometer optical transmission assembly according to claim 1, wherein the input mirror is an input focusing lens and the output mirror is a parabolic mirror.
3. The terahertz fiber spectrometer optical transmission assembly according to claim 2, wherein the light splitting device is a light splitting sheet, the light splitting sheet has a transmission surface and a reflection surface, the transmission surface is opposite to the input focusing lens, and the reflection surface is opposite to the parabolic mirror and the detection focusing lens; the input optical path passes through the transmissive surface and the output optical path changes direction at the reflective surface.
4. A terahertz fiber optic spectrometer optical transmission assembly according to claim 3, wherein the parabolic mirror is matched in position to the reflecting surface of the beam splitter such that a portion of the output optical path from the parabolic mirror to the receiving end is juxtaposed with the input optical path in a straight line.
5. The terahertz fiber optic spectrometer optical transmission assembly according to claim 3, wherein the input focusing lens, the beam splitter, the detection focusing lens and the parabolic mirror are all disposed in a mounting structure provided with a plurality of optical device mounting fixtures and mounting holes.
6. The small-size detection probe of terahertz fiber spectrometer, including box-shaped casing, emission subassembly and receiving module, its characterized in that still includes a terahertz fiber spectrometer optical transmission subassembly of any one of claims 1-5, terahertz fiber spectrometer optical transmission subassembly sets up in the casing, emission subassembly and receiving module set up in the rear end face of casing and connect emission end and receiving end respectively.
7. The small-sized detection probe for terahertz fiber spectrometer of claim 6, wherein the housing is provided with a detection port, the detection port is arranged on the front end surface of the housing, the detection focusing lens is arranged in the detection port, and the detection port is opposite to the detection surface.
8. The terahertz fiber spectrometer small-sized detection probe according to claim 6, wherein a first photoconductive antenna is arranged in the transmitting assembly; and a second photoconductive antenna is arranged in the receiving assembly, and a silicon lens is arranged between the second photoconductive antenna and the output light path.
9. A terahertz fiber spectrometer detection system, which is characterized by comprising the terahertz fiber spectrometer small-sized detection probe as claimed in claim 7 or 8, and further comprising an adjustable supporting mechanism and a distance measuring mechanism, wherein the terahertz fiber spectrometer small-sized detection probe is arranged on the adjustable supporting mechanism, and the adjustable supporting mechanism supports a shell and adjusts the distance between a sample and a detection port; the distance measuring mechanism is used for measuring the distance between the sample and the detection port.
10. The terahertz fiber optic spectrometer detection system according to claim 9, comprising a laser, a laser beam splitter, a first coupler, a second coupler, and an optical delay assembly; the laser generates femtosecond laser, the laser beam splitter divides the femtosecond laser into pump light and detection light, the first coupler couples the pump light into a first photoconductive antenna of the emission component, the second coupler couples the detection light passing through the optical delay component into a second photoconductive antenna of the receiving component, and the optical delay component is used for changing the optical path of the detection light.
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| CN202223422154.9U CN219552251U (en) | 2022-12-16 | 2022-12-16 | Terahertz optical fiber spectrometer optical transmission assembly, small detection probe and system |
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| CN202223422154.9U CN219552251U (en) | 2022-12-16 | 2022-12-16 | Terahertz optical fiber spectrometer optical transmission assembly, small detection probe and system |
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