CN102621123A - Focusing device of handheld Raman spectrometer - Google Patents

Abstract

The invention relates to a focusing device of a handheld Raman spectrometer, which comprises a lens support and a collecting lens. The lens support is mounted at the front end of a main body of the handheld Raman spectrometer, the collecting lens is fixedly mounted in the lens support, the lens support is a circular sleeve, a lens barrel is movably mounted at the front of the collecting lens in the circular sleeve, a sample to be tested is tightly attached to the outer end surface of the lens barrel, and the distance from the sample to be tested to the collecting lens is adjusted by means of moving the lens barrel. The focusing device of the handheld Raman spectrometer is simple in structure and reasonable in constitution, and the relative distance from the sample to be tested to the collecting lens of the Raman spectrometer can be flexibly adjusted. The device can be applied to the handheld Raman spectrometer, Raman scattering light is assuredly collected by the Raman spectrometer to the greatest extent, the optimal positions of samples can be flexibly and quickly found out according to different samples, and the samples to be tested are accurately positioned.

Description

Handheld Raman spectrometer focusing device

FIELD

[0001] The present invention belongs to the field of optical machinery, in particular to a handheld Raman spectrometer focusing device.

Background technique

[0002] Handheld Raman spectrometer with a small, flexible detection for field detection, etc., are widely used in the pharmaceutical, food safety, monitoring and other fields of explosives. Handheld Raman spectrometer generally consists of a laser source, external light path system, spectrometer, detector and computer processing system configuration in which external light path system of collection lens (objective) after converging accurate incident light beam to be measured at the sample, and test sample collected by the Raman scattering light generated by excitation of the laser beam. When the instrument fixed optical system, the laser beam focus position is fixed, but in the detection, samples of different materials for different internal focusing a laser beam thereon the desired depth, only when the laser beam is focused on a specific position inside the sample to be tested when, Raman spectrometer can more efficiently collect the Raman scattered light, a slight change in the position of test sample will have a significant impact on the collection efficiency of the scattered light, therefore, need to be flexible in the actual detection of the test sample between the instrument and the distal end an objective lens relative distance to determine the optimal position of the test sample is placed. Handheld Raman spectrometer flexibility in the use of features, which requires to have a flexible positioning apparatus capable of different samples in the detection process, however, the various currently commercially available handheld Raman spectrometer are unable to provide this feature to achieve the apparatus and sample to be tested directly against the front end of the instrument barrel is detected, since this may result in inaccurate positioning of the sample and the collected Raman spectra collected even weaker intensity than spectrum and other phenomena, reduced hand-held analytical performance Raman spectrometer.

SUMMARY

[0003] The present invention solves the technical problem to overcome the deficiencies of the prior art, provide a simple, rational composition can be flexibly adjusted relative distance between the test sample and the collection lens Raman spectrometer, a Raman spectrometer to ensure maximize the Raman scattered light collected, treated test sample to achieve a handheld Raman spectrometer focusing device accurately positioned.

[0004] The technical solution to the above technical problem of the present invention is employed: a handheld Raman spectrometer focusing apparatus including a lens holder, collection lens, said lens holder is attached to the front end of the body handheld Raman spectrometer, collection lens fixedly mounted in the lens holder, characterized in that: said lens holder sleeve is circular, circular collecting lens sleeve movably mounted in front of a lens barrel, an outer end surface of the barrel close to the test sample, by moving the mirror cylinder, adjusting the distance between the test sample and the collection lens.

Mobile [0005] The present invention before and after the lens holder is provided with an internal thread, an external thread is provided with the lens barrel, the lens barrel and the lens holder threaded engagement, rotation of the barrel, which may be the source light beam in the direction of the lens holder.

[0006] a lower side of the lens axially within the stent of the present invention is provided with a lead screw, axial side of the guide is provided with screw thread guide groove the barrel, rotation of the lead screw, the barrel may be driven in the lens holder move back and forth direction of the light beam.

[0007] The present invention is built in the lens holder has a circular sleeve a movable lens barrel, the sample close to the outer end surface of the barrel, located at a position perpendicular to the direction of the light beam, by moving the barrel, can drive the sample to be tested flexible light source is moved in the direction of the beam, adjusting the distance between the test sample and the collection lens to achieve focusing of the handheld Raman spectrometer. Control prior art, the present invention has simple structure, composition and reasonable, the flexibility to adjust the relative distance between the test sample and the collection lens Raman spectrometer. The device can be used most handheld Raman spectrometer by flexibly adjusting the relative distance between the sample and the objective lens Raman spectrometer, a Raman spectrometer to ensure that the maximum degree of collection of the Raman scattered light, and flexible for different samples quickly find the sample is placed optimal position, sample to be measured to achieve accurate positioning.

BRIEF DESCRIPTION

DRAWINGS The invention is described in detail [0008] below in conjunction.

[0009] FIG. I is a schematic view of the present invention.

[0010] FIG. 2 is a schematic view of another structure of the present invention.

[0011] FIG numbers here:.... A sample to be tested, the lens barrel 2, the lens holder 3, collection lens 4, 5 handheld Raman spectrometer body 6 of the lead screw, the thread guide grooves 7....

detailed description

[0012] From FIG. I, it can be seen in FIG. 2, a hand-Raman spectrometer focusing apparatus comprises a lens holder 3, collection lens 4, the lens holder 3 is attached to the handheld Raman spectrometer distal body 5 , collection lens 4 is fixedly mounted in the lens holder 3. Handheld Raman spectrometer and a body 5 connected to the lens holder 3, belongs to the prior art, will not be repeated.

[0013] The lens holder 3 of the present invention a circular sleeve, collection lens 4 is fixedly mounted in the rear portion of the lens holder 3 circular sleeve. Collection lens within the lens holder 3 in front of the circular sleeve 3 is mounted a movable lens barrel 2. The same as the outer diameter of the lens barrel 3 and the inner diameter of the circular sleeve of the lens holder, the lens holder embedded in the barrel 3, the light source can be flexibly moved in the beam direction within a circular sleeve. 2 against the outer end surface of the lens barrel with a test sample 1, by moving the barrel 2, adjusting the distance between I and 4 test sample collection lens to achieve focusing of the handheld Raman spectrometer.

[0014] Figure I is a block diagram of an embodiment of the present invention. FIG I in the lens holder 3 is provided with an internal thread, the lens barrel 2 is provided with a corresponding external thread, the lens barrel 2 is threadedly engaged with the lens holder 3, the lens barrel 2 is rotated, along which a light source within the lens holder 3 the light beam moves back and forth direction. The sample to be tested I close contact with the outer end face of the lens barrel 2, the lens barrel to drive the movement of the test sample relative to the beam direction moving collection lens, thereby flexibly adjust the relative distance between the test sample and the collection lens. In the course of rotation of the lens barrel can be observed in real time by the mass spectra acquired spectral software, when the moving lens barrel is stopped to collect the maximum intensity of the sample spectra, i.e., the location of the sample at this time, the optimum location of the sample.

[0015] FIG. 2 is a schematic structural diagram of another embodiment of the present invention. 2, the lower side of the lens holder 3 within an axial guide is provided with a screw 6, the lens barrel 2 is provided with an axial side of the lead screw 6 with threaded guide groove 7, the rotation of the lead screw 6, moving the light source back and forth along the beam direction within the lens barrel to drive the lens holder. The sample to be tested at I close the outer end of the lens barrel 2, the barrel can drive the mobile beam direction with respect to the sample collection lens moves, and thus the flexible adjustment of the relative distance between the sample and the collection lens. During the rotation of the lead screw can be observed in real time by the mass spectra acquired spectral software, when the moving lens barrel is stopped to collect the maximum intensity of the sample spectra, i.e., the location of the sample at this time, the optimum location of the sample.

Claims (3)

1. 1. A handheld Raman spectrometer focusing apparatus including a lens holder, collection lens, said lens holder is attached to the front end of the body handheld Raman spectrometer, collection lens mounted in the lens holder is fixed, characterized in that: said the lens holder is a circular sleeve, in front of the collection lens barrel movably mounted within a circular sleeve, the outer end surface of the lens barrel against the test sample, by moving the lens barrel, adjusting the distance between the test sample and the collection lens .
2. The handheld Raman spectrometer focusing device of claim I, wherein wherein: the lens holder is provided with an internal thread, an external thread is provided with the lens barrel, the lens barrel and the lens holder threaded engagement, rotation of the barrel, which is movable along the longitudinal direction of the source light beam within the lens holder.
3. The handheld Raman spectrometer focusing device according to claim I, wherein: a lead screw is provided with an axial lower side within the lens holder, the side provided with an axial lead screw with the barrel the thread guide groove, the guide screw is rotated, the lens barrel can be moved back and forth to drive the lens holder in the direction along the light beam.