CN219532274U - Optical fiber spectrometer - Google Patents

Abstract

The utility model relates to the technical field of detection equipment, in particular to an optical fiber spectrometer. The imaging sensor assembly comprises a base, an imaging sensor and an electric connecting piece, wherein a film-plating collecting lens is arranged in front of one side of the imaging sensor, which faces the imaging lens, and the film-plating collecting lens comprises a collecting lens and a film-plating layer, and the film-plating layer is arranged on the incident surface of the collecting lens. The optical fiber spectrometer can improve the light intensity, increase the sensitivity of the optical fiber spectrometer, reduce the detection lower limit of the optical fiber spectrometer, and expand the detection range of the optical fiber spectrometer, thereby improving the detection capability of the optical fiber spectrometer.

Description

Optical fiber spectrometer

Technical Field

The utility model relates to the technical field of detection equipment, in particular to an optical fiber spectrometer.

Background

In the detection of the concentration of gaseous components, the detection of optical analysis based on spectroscopy by utilizing the interaction characteristics of light and gas molecules has become an important technical means for the detection of the concentration of gaseous components, especially the detection of the concentration of atmospheric pollutants. The optical measurement method has the advantages of wide range, quick response, multiple detection components, high detection precision, continuous real-time detection and the like, and the instrument is also widely used for the determination of various trace and constant inorganic and organic substances in soil, the qualitative and structural analysis of inorganic minerals and organic substances and the soil chemical process (complexation-analysis, dissolution precipitation, acid-base dissociation constant and the like), and also used for plant nutrition diagnosis and nutrition quality analysis, such as the analysis of protein, starch, soluble sugar, vitamin C, iron, manganese, copper, zinc, boron and other elements, and the determination of root system activity and multiple enzyme activities.

In the process of deep ultraviolet detection, deep ultraviolet light (with the wavelength of 190-250 nm) is influenced by factors such as airflow, temperature, water vapor, air and the like, and energy can be weakened. The intensity efficiency of the deep ultraviolet luminous light of various light sources which are frequently used at present is low, and the detection of the deep ultraviolet is inconvenient. In addition, due to limitations of the current ultraviolet detection instrument, the imaging sensor has low sensitivity to deep ultraviolet. The application range of the deep ultraviolet detection instrument is seriously affected by various factors.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, and provides an optical fiber spectrometer which can improve the light intensity, increase the sensitivity of the optical fiber spectrometer, reduce the detection lower limit of the optical fiber spectrometer, and expand the detection range of the optical fiber spectrometer, thereby improving the detection capability of the optical fiber spectrometer.

The technical scheme of the utility model is as follows: an optical fiber spectrometer comprises a shell, a collimating lens, a grating, an imaging lens and an imaging sensor assembly, wherein the imaging sensor assembly comprises a base, an imaging sensor and an electric connecting piece,

and a film plating collecting lens is arranged in front of one side of the imaging sensor, which faces the imaging lens, and comprises a collecting lens and a film plating layer, wherein the film plating layer is arranged on the incident surface of the collecting lens.

In the utility model, the bottom of the shell is fixedly connected with the bottom plate, the top of the shell is connected with the top plate, the shell, the bottom plate and the top plate form a cavity, and the collimating mirror, the grating, the imaging mirror and the imaging sensor are arranged in the cavity.

The imaging sensor and the electrical connection piece are arranged on the base.

The film plating collecting lens is arranged on the collecting lens connecting plate;

the bottom of the collecting lens connecting plate is fixedly connected with the base, the upper part of the collecting lens connecting plate is provided with a collecting lens clamping groove in the horizontal direction, and the coated collecting lens is arranged in the collecting lens clamping groove in a sliding manner.

One end of the collecting lens clamping groove is in an opening shape, and the other end of the collecting lens clamping groove is in a closed shape.

The imaging sensor and the imaging mirror are oppositely arranged, and the grating and the collimating mirror are oppositely arranged.

And a diaphragm is arranged on the side surface of the imaging lens facing the imaging sensor.

By reasonably setting the focal length of the condenser, the focal point of the condenser can be just positioned on the pixel of the imaging sensor.

The beneficial effects of the utility model are as follows:

(1) The focal length of the collecting lens is reasonably set, so that the focal point of the collecting lens is exactly positioned on the pixel of the imaging sensor, and the light reflected by the imaging lens is converged by the collecting lens, so that the intensity of the light is enhanced;

(2) The film coating layer is arranged on the incident surface of the collecting lens, fluorescent agents of different materials are coated according to different requirements, the fluorescent agents are converted into visible light under the irradiation of ultraviolet rays, the wavelength of the visible light corresponds to the wavelength with high sensitivity, and the phase change enhances the light intensity, so that the sensitivity of the optical fiber spectrometer is increased; meanwhile, the detection lower limit is reduced, and the detection range is expanded to deep ultraviolet, so that the detection range of the optical fiber spectrometer is expanded, and the detection capability is improved.

Drawings

FIG. 1 is a schematic view of the internal structure of the present utility model;

FIG. 2 is a schematic diagram of the structure of an imaging sensor;

FIG. 3 is an optical path diagram of the present utility model;

fig. 4 is a spectrum contrast diagram of the fiber optic spectrometer before and after modification.

In the figure: 1, a shell; 2, a collimating mirror; 3 an imaging sensor assembly; 4, a film-plating condenser; 5 grating; 6, an imaging mirror; 7, an imaging sensor; 8 an electrical connection; 9, a base; 10, a collecting lens connecting plate; 11, a collecting lens clamping groove; a 12-focus lens; 13 coating film layers; 14, a diaphragm; 15 slits; 16 optical fibers.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings.

In the following description, specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than those herein described, and those skilled in the art may readily devise numerous other arrangements that do not depart from the spirit of the utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

As shown in fig. 1, the optical fiber spectrometer of the utility model comprises a housing 1, a collimator lens 2, an imaging sensor assembly 3, a grating 5 and an imaging lens 6, wherein a bottom plate is fixedly arranged at the bottom of the housing 1, the top of the housing 1 is fixedly connected with a top plate, the housing 1, the bottom plate and the top plate form a closed cavity, and the collimator lens 2, the imaging sensor assembly 3, the grating 5 and the imaging lens 6 are all arranged in the cavity. The imaging sensor assembly 3 and the imaging lens 6 are arranged oppositely, and the collimating lens 2 and the grating 5 are arranged oppositely. A diaphragm 14 is provided on the reflecting surface side of the imaging mirror 6, the diaphragm being used to limit the light beam.

As shown in fig. 2, the imaging sensor assembly 3 includes a base 9, an imaging sensor 7, and an electrical connector 8, both the imaging sensor 7 and the electrical connector 8 being disposed on the base 9. The front of the imaging sensor 7, that is, the front of the imaging sensor 7 on the side facing the imaging mirror 6, is provided with a film-coated condenser lens 4. In this embodiment, the coated condenser 4 is disposed on the condenser connection plate 10.

The collecting lens connecting plate 10 is L-shaped and comprises a horizontal plate and a vertical plate which are vertically connected, and the horizontal plate is fixedly connected with the upper surface of the base 9 through bolts. The vertical plate is provided with a condensing lens clamping groove 11 in the horizontal direction, one end of the condensing lens clamping groove 11 is opened, and the other end is closed. The film plating collecting lens 4 can be inserted into the collecting lens clamping groove 11 in a sliding mode, and the film plating collecting lens 4 can be accurately positioned through the collecting lens clamping groove 11.

As shown in fig. 3, the film plating condenser 4 includes a condenser 12 and a film plating layer 13, and the film plating layer is provided on the incident surface of the condenser 12, that is, the side of the condenser facing the imaging mirror is film-plated. The medium of the film coating layer 13 is ultraviolet fluorescent powder, and in the actual use process, different fluorescent materials are adopted to carry out optical film coating on the condenser according to different required wave bands. The fluorescent agent can convert weaker ultraviolet light into visible light under the irradiation of ultraviolet rays. Although the intensity of the light is not changed, the visible light generated by the coating layer appears in a wave band with high sensitivity of the imaging sensor, and the light intensity in the imaging sensor outside the deep ultraviolet is enhanced by phase change. In addition, the focal length of the collecting lens is reasonably set, so that the focal point of the collecting lens is just positioned on the pixel of the imaging sensor, and the light rays irradiated by the imaging lens are converged by the collecting lens 12, so that the intensity of ultraviolet light is also enhanced.

The principle of operation of the optical fiber spectrometer of the present utility model will be described with reference to fig. 3. The optical fiber 16 transmits ultraviolet light, the ultraviolet light enters the collimating mirror 2 at a divergent angle after passing through the slit 15, the ultraviolet light collimated by the collimating mirror 2 is diffracted by the grating 5, and the optical fibers with different wavelengths have different diffraction angles. The diffracted light of all wavelengths is reflected by the imaging mirror 6 to the film plating condenser 4, and the intensity of the light incident on the imaging sensor 7 is enhanced by the film plating condenser 4. The imaging sensor 7 receives the optical signal and converts the optical signal into a processable digital signal.

As shown in FIG. 4, compared with the existing optical fiber spectrometer, the optical fiber spectrometer has the advantages that the light intensity at 200nm is increased to three times, the differential cross-sectional area is increased by 9 times by performing differential calculation according to the lambert beer law, that is, the detection sensitivity of the optical fiber spectrometer is increased by 9 times when detecting gases such as nitric oxide, sulfur dioxide and the like or ammonia escape detection is carried out, so that the detection lower limit of the optical fiber spectrometer is reduced to 1/9 of the current detection lower limit. Therefore, the optical fiber spectrometer can improve the light intensity of far ultraviolet band, increase the sensitivity of the optical fiber spectrometer, and reduce the detection lower limit of the optical fiber spectrometer, thereby expanding the detection range of the optical fiber spectrometer.

The fiber spectrometer provided by the utility model is described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. An optical fiber spectrometer comprises a shell, a collimating lens, a grating, an imaging lens and an imaging sensor assembly, wherein the imaging sensor assembly comprises a base, an imaging sensor and an electric connecting piece,

and a film plating collecting lens is arranged in front of one side of the imaging sensor, which faces the imaging lens, and comprises a collecting lens and a film plating layer, wherein the film plating layer is arranged on the incident surface of the collecting lens.

2. The optical fiber spectrometer according to claim 1, wherein,

the bottom of casing fixedly connected with bottom plate, the top of casing is connected with the roof, and the cavity is constituteed to casing, bottom plate and roof, and collimating mirror, grating, imaging mirror and imaging sensor set up in this cavity.

3. The optical fiber spectrometer according to claim 1, wherein,

the imaging sensor and the electrical connection piece are arranged on the base.

4. The optical fiber spectrometer according to claim 1, wherein,

the film plating collecting lens is arranged on the collecting lens connecting plate;

the bottom of the collecting lens connecting plate is fixedly connected with the base, the upper part of the collecting lens connecting plate is provided with a collecting lens clamping groove in the horizontal direction, and the coated collecting lens is arranged in the collecting lens clamping groove in a sliding manner.

5. The optical fiber spectrometer according to claim 4, wherein,

one end of the collecting lens clamping groove is in an opening shape, and the other end of the collecting lens clamping groove is in a closed shape.

6. The optical fiber spectrometer according to claim 1, wherein,

the imaging sensor and the imaging mirror are oppositely arranged, and the grating and the collimating mirror are oppositely arranged.

7. The optical fiber spectrometer according to claim 1, wherein,

and a diaphragm is arranged on the side surface of the imaging lens facing the imaging sensor.

8. The optical fiber spectrometer according to claim 1, wherein,

the focal point of the condenser lens is positioned on a pixel of the imaging sensor.