CN210136165U

CN210136165U - Probe device with external light source

Info

Publication number: CN210136165U
Application number: CN201920873709.0U
Authority: CN
Inventors: 李纪华; 郑留念
Original assignee: Fluorescent Optical Technology (shanghai) Co Ltd
Current assignee: Fluorescent Optical Technology (shanghai) Co Ltd
Priority date: 2019-06-12
Filing date: 2019-06-12
Publication date: 2020-03-10
Anticipated expiration: 2029-06-12

Abstract

The utility model provides a probe device that is used for external light source of Fourier near infrared spectroscopy analysis instrument, contains dustcoat subassembly, optical part fixed subassembly, light source adjustment subassembly, sample switching module. The housing assembly provides a space for sealing internal devices, and interfaces of components such as electric wires and optical fibers; the optical part fixing component is used for fixing parts such as a lens, an optical fiber connector and the like; the light source adjusting component is used for fixing the light source and adjusting the position of the light source; the sample switching assembly is used for switching between the background light incident on the background sheet by the light source and the light reflected by the surface of the measured object. The utility model discloses compact structure, the debugging is convenient, has better practical value.

Description

Probe device with external light source

Technical Field

The utility model belongs to the spectral analysis field, in particular to Fourier transform is probe unit of external light source for spectrum appearance.

Background

The basic operating principle of fourier transform infrared spectroscopy (FTIR) is: the collimated infrared light beam carrying the sample information to be measured is incident into the Michelson interferometer, the movement of a movable mirror in the interferometer is controlled, interferograms under different optical path differences are obtained, Fourier transformation is carried out on the obtained interferograms, an infrared spectrogram of the light beam is obtained, and the component information of the measured object is obtained after the spectrograms are compared.

In a conventional Fourier transform infrared spectrometer, a light source is arranged in the spectrometer and then is transmitted and guided out through a lens and an optical fiber to irradiate on an object to be measured. Because the light spot emitted by the instrument is small, the surface area of the measured object is large, and the sample information obtained by the light reflected back to the instrument is limited; the light emitted by the instrument is transmitted for many times through various devices, and energy is lost; the measured object surface is also uneven, the light spot is small, and after energy loss, the light reflected by the diffuse reflection is focused back to the instrument with great difficulty.

The probe with the external light source directly places the light source in the probe, and directly irradiates the measured object through the sealed window without other optical devices, so that the energy of the light beam is large, the transmission loss is less, and the aperture of the light spot is larger; the light beams reflected by the surface of the object are collected by the converging optical element and transmitted to the Fourier transform infrared spectrometer for analysis and processing through the optical fiber.

SUMMERY OF THE UTILITY MODEL

The utility model provides a probe unit of external light source has compact structure, the characteristics of convenient processing, assembly and debugging, and the device has that the protection against the tide prevents that grey is sealed, optical device supports fixed function, can also switch the light of background light sum through measured object surface reflection on the light source incides the background piece simultaneously, and convenience of customers uses and obtains high-quality spectrogram.

The utility model discloses a technical solution as follows:

a probe device of an external light source is characterized by comprising: the device comprises a housing assembly, an optical element fixing assembly, two light source adjusting assemblies and a sample switching assembly;

the outer cover assembly is cylindrical and comprises a lifting ring, a joint sealing ring, a middle section cavity, four fixing rods, a window sheet cover, a window sheet and a sealing bottom ring from top to bottom, wherein the upper ends of the four fixing rods are fixedly connected with the joint sealing ring, and the window sheet cover, the window sheet and the sealing bottom ring are connected;

the optical part fixing component comprises an optical fiber connector, a fixing seat, a lens barrel ferrule, a lens ring I, a lens ring II and a limit switch seat, and the fixing seat is connected with the four fixing rods of the outer cover component; the optical fiber connector is screwed into the threaded hole in the middle of the top of the fixed seat; the cylinder of the lens barrel ferrule is arranged in a cylindrical cavity at the upper part of the fixing seat and is locked by a jackscrew, and the lens ring II is arranged in a cylindrical cavity in the lens barrel ferrule and is locked by the jackscrew; the first lens ring is fixed in a cylindrical hole at the bottom of the fixed seat; the two limit switch seats are fixed on the front outer side and the rear outer side of the fixed seat;

the two light source adjusting assemblies have the same structure and respectively comprise a light source seat, a light source, a first adjusting screw, a second adjusting screw, a third adjusting screw, a first locking screw and a second locking screw, the three adjusting screws and the two locking screws penetrate through the through holes of the light source seat and are screwed into corresponding screw holes of the fixed seat, the light source seat is respectively arranged on the left shoulder part and the right shoulder part of the fixed seat, and three compression springs are respectively sleeved on the three adjusting screws between the light source seat and the fixed seat;

the sample switching assembly comprises a motor, a spur rack, a circular gear, a first reflector, a guide rail mounting plate, a guide rail, a sliding block, a second reflector, a translation panel, a shading cylinder, a limit switch and a background sheet, wherein the motor is fixed on the lower part of a fixing seat through a motor base and the guide rail mounting plate, the circular gear is fixed on an output shaft of the motor, the spur rack is fixed on the translation panel through a transition part, the guide rail is mounted on the lower surface of the guide rail mounting plate, the first reflector and the second reflector are symmetrically fixed on the left side and the right side of the translation panel, the background sheet and the shading cylinder are fixed in the middle of the translation panel from front to back, and the limit switch is fixed on the limit switch base;

the optical fiber connector, the lens barrel ferrule, the lens ring I and the lens ring II are coaxial, and two connector holes are formed in the connector sealing ring and used for the penetrating connection of an electric wire and an optical fiber; the sealing bottom ring is provided with three light through holes, so that light emitted by the two light sources and light reflected by the measured object can pass through the sealing bottom ring without being blocked; and the corresponding connecting parts of the joint sealing ring, the middle section cavity, the window sheet and the sealing bottom ring are sealed by an O-shaped rubber ring.

The utility model has the advantages as follows:

the probe device with the external light source of the utility model arranges the main optical element and the electromechanical device in the outer cover, has the functions of sealing, moisture and dust prevention, and has clean interior without polluting the surface of the optical element; the outside is provided with optical fibers and wire joint holes, so that the transmission of electric signals and optical signals is facilitated; a standard background sheet is arranged in the device, and the spectrum of the light source can be calibrated; the background sheet can move and switch in the light path, and does not influence the transmission of the light path when the detected object is detected; the device has compact structure, convenient processing, assembly and debugging and better practical application value.

Drawings

FIG. 1 is a front cross-sectional view of the probe device with external light source of the present invention;

FIG. 2 is a schematic view of the cover assembly of the present invention;

fig. 3 is a schematic view of the optical member fixing assembly of the present invention;

fig. 4 is a schematic view of a fixing base of the optical component fixing assembly of the present invention;

fig. 5 is a schematic view of the light source adjusting assembly of the present invention;

fig. 6 is a front view of the sample switching assembly of the present invention;

fig. 7 is a right side cross-sectional view of the sample switching assembly of the present invention;

Detailed Description

The present invention will be further described with reference to the accompanying drawings, which should not be construed as limiting the scope of the invention.

Please refer to fig. 1 first, fig. 1 is a front sectional view of the probe apparatus with external light source of the present invention, which is visible from the figure, the present invention discloses a probe apparatus with external light source, which includes: the device comprises a housing assembly 1, an optical element fixing assembly 2, a light source adjusting assembly 3 and a sample switching assembly 4.

Referring to fig. 2, the housing assembly 1 is cylindrical and includes, from top to bottom, a hanging ring 101, a joint sealing ring 102, a middle cavity 103, a window cover 106, a window 105, and a sealing bottom ring 107; the thread of the lifting ring 101 is fixed on the upper surface of the joint sealing ring 102, the upper ends of four fixing rods 104 are fixed on the inner surface of the joint sealing ring 102, and the joint sealing ring 102 is provided with two joint holes for the penetrating connection of an electric wire and an optical fiber; the sealing bottom ring 107 is provided with three light through holes, and light emitted by the two light sources and light reflected by the measured object can pass through without being blocked; the corresponding connection parts of the joint sealing ring 102, the middle section cavity 103, the window sheet 105 and the sealing bottom ring 107 are sealed by O-shaped rubber rings.

Referring to fig. 3 and 4, the optical component fixing assembly 2 is fixed on four fixing rods 104 of the housing assembly 1, and the optical fiber connector 201 is screwed into a threaded hole at the top of the fixing base 202; the cylinder of the lens barrel ferrule 203 is matched in the cylindrical cavity at the upper part of the fixed seat 202 and is locked by a jackscrew; the first lens ring 204 is fixed in a cylindrical hole below the fixed seat 202; the limit switch base 206 is fixed at the front and rear outer sides of the bottom of the fixed base 202; the second lens ring 205 is placed in a cylindrical cavity inside the lens barrel ferrule 203 and locked with a jackscrew. The axes of the optical fiber connector 201, the lens barrel ferrule 203, the first lens ring 204 and the second lens ring 205 are on the same straight line, which is beneficial to leading the light beam into the optical fiber after being converged and collimated.

Referring to fig. 5, the two light source adjusting assemblies 3 are disposed on the left and right shoulders above the fixing base 202, and include a light source base 301, a light source 302, a first adjusting screw 303, a second adjusting screw 304, a third adjusting screw 305, a first locking screw 306, a second locking screw 307, and the like, all of which pass through the through hole of the light source base 301 and are screwed into the fixing base 202, three compression springs are respectively sleeved on the three adjusting screws between the light source base 301 and the fixing base 202, the direction of the light beam of the light source 302 is controlled by slightly rotating the three adjusting screws, the light emitted by the two light source adjusting assemblies can be better irradiated onto the object to be measured, and the locking screws are screwed to further fix the light source base 301 after the light source 302 is adjusted.

Referring to fig. 6 and 7, the sample switching assembly 4 includes a motor 401, a spur rack 402, a circular gear 403, a first reflector 404, a guide rail mounting plate 405, a guide rail 406, a slider 407, a second reflector 408, a translation panel 409, a light shielding cylinder 410, a limit switch 411, a background sheet 412, and the like, the motor 401 is fixed on the fixing base 202 through the motor base and the guide rail mounting plate 405, the circular gear 403 is fixed on an output shaft of the motor 401, the spur rack 402 is fixed on the translation panel 409 through a transition part, the guide rail 406 is mounted on the guide rail mounting plate 405, the first reflector 404 and the second reflector 408 are fixed on left and right sides of the translation panel 409, the background sheet 412 and the light shielding cylinder 410 are fixed in the middle of the translation panel 409 in a front-back manner, and the limit switch 411. When the axis of the shading cylinder 410 is consistent with the lens cylinder ferrule 203, the light beam emitted by the light source 302 is transmitted by the window sheet 105 and then irradiates the object to be measured, the light reflected by the surface of the object to be measured is transmitted by the axis of the lens cylinder ferrule 203 and converged on the optical fiber connector, and the light is guided into a spectrometer for analysis through the optical fiber. The guide rail mounting plate 405 is fixed on the fixed seat 202, and the guide rail 406 and the sliding block 407 are used for positioning movement; the driving motor 401 rotates, and the circular gear 403 drives the spur rack 402 and the translation panel 405 to move linearly, so that the background sheet and the shading cylinder fixed on the translation panel 405 will also move. At this time, light beams of the left and right light sources are reflected to inclined planes on two sides of the background sheet through the first reflector 404 and the second reflector 408, and then further reflected to enter a lens of the second lens ring 205 to be converged on the optical fiber, and the background sheet can be made of polytetrafluoroethylene and other materials with standard spectrum, so that the light source spectrum correction work is completed. When the background film and the shading cylinder are switched according to the requirement, the moving position is limited by the limit switch.

The probe device with the external light source has the advantages that the redundant space in the probe device can be used for installing other devices such as a circuit board and the like, and the purposes of saving space and miniaturizing equipment are achieved.

The invention has been described in the foregoing description and drawings by way of illustration rather than limitation, and various changes, modifications or adaptations of the embodiments described above may be made without departing from the invention as defined in the appended claims.

Claims

1. A probe device of an external light source is characterized by comprising: the device comprises a housing assembly (1), an optical piece fixing assembly (2), two light source adjusting assemblies (3) and a sample switching assembly (4);

the outer cover assembly (1) is cylindrical and comprises a lifting ring (101), a joint sealing ring (102), a middle section cavity (103), four fixing rods (104), a window sheet cover (106), a window sheet (105) and a sealing bottom ring (107) from top to bottom, the upper ends of the four fixing rods (104) are fixedly connected with the joint sealing ring (102), and the window sheet cover (106), the window sheet (105) and the sealing bottom ring (107) are connected;

the optical part fixing component (2) comprises an optical fiber connector (201), a fixing seat (202), a lens barrel ferrule (203), a lens ring I (204), a lens ring II (205) and a limit switch seat (206), wherein the fixing seat (202) is connected with four fixing rods (104) of the outer cover component (1); the optical fiber connector (201) is screwed into a threaded hole in the middle of the top of the fixed seat (202); the cylinder of the lens barrel ferrule (203) is arranged in a cylindrical cavity at the upper part of the fixing seat (202) and is locked by a jackscrew, and the lens ring II (205) is arranged in a cylindrical cavity in the lens barrel ferrule (203) and is locked by the jackscrew; the first lens ring (204) is fixed in a cylindrical hole at the bottom of the fixed seat (202); the two limit switch bases (206) are fixed on the front outer side and the rear outer side of the fixed base (202);

the two light source adjusting assemblies (3) have the same structure and respectively comprise a light source seat (301), a light source (302), an adjusting screw I (303), an adjusting screw II (304), an adjusting screw III (305), a locking screw I (306) and a locking screw II (307), the three adjusting screws and the two locking screws penetrate through the through hole of the light source seat (301) and are screwed into the corresponding screw holes of the fixing seat (202), the light source seat (301) is respectively arranged on the left shoulder part and the right shoulder part of the fixing seat (202), and three compression springs are respectively sleeved on the three adjusting screws between the light source seat (301) and the fixing seat (202);

sample switching module (4) contain motor (401), spur rack (402), round gear (403), speculum (404), guide rail mounting panel (405), guide rail (406), slider (407), speculum two (408), translation panel (409), light-shielding cylinder (410), limit switch (411) and background piece (412), motor (401) be fixed in the lower part of fixing base (202) through motor cabinet and guide rail mounting panel (405) together, round gear (403) fix the output shaft of motor (401) on, spur rack (402) fix through transition part on translation panel (409), guide rail (406) install the lower surface of guide rail mounting panel (405) on, speculum one (404) and speculum two (408) symmetrically fix the left and right sides of translation panel (409), the background sheet (412) and the shading cylinder (410) are fixed in the middle of the translation panel (409) in a front-back mode, and the limit switch (411) is fixed on the limit switch seat (206);

the optical fiber connector (201), the lens barrel ferrule (203), the lens ring I (204) and the lens ring II (205) are coaxial, and two connector holes are formed in the connector sealing ring (102) and used for the penetrating connection of an electric wire and an optical fiber; the sealing bottom ring (107) is provided with three light through holes for allowing light emitted by the two light sources and light reflected by a measured object to pass through without shielding; and the corresponding connecting parts of the joint sealing ring (102), the middle section cavity (103), the window sheet (105) and the sealing bottom ring (107) are sealed by O-shaped rubber rings.