Miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device

Abstract

The utility model discloses a miniaturized fluorescence detection device for petroleum hydrocarbon pollutants in soil. The miniaturized fluorescence detection device comprises an excitation light path device, a window and a receiving light path device, the window is arranged on a light path of ultraviolet laser emitted by the excitation light path device, and the receiving light path device is arranged on a fluorescence path reflected by the window; wherein turning prisms are arranged in the excitation light path device and the receiving light path device, and the total reflection surfaces of the turning prisms are used as the reflection surfaces of the light paths. The miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device disclosed by the utility model can be used for solving the problem that the existing detection device is large in size.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental detection, in particular to a miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device. Background Art

[0002] In order to effectively prevent and control soil petroleum hydrocarbon pollution, it is necessary to accurately detect the soil petroleum hydrocarbon pollution status. Traditional soil petroleum hydrocarbon detection methods such as infrared spectrophotometry, high performance liquid chromatography, gas chromatography, gas chromatography-mass spectrometry, Soxhlet extraction and weight method all require soil sample extraction operations, which are complicated to operate and have a harsh operating environment. They cannot be used for on-site measurement of soil petroleum hydrocarbon pollutants. However, during the collection, transportation and pretreatment of soil samples contaminated by petroleum hydrocarbons, secondary pollution is very likely to occur, and some pollutant components are highly volatile, making it difficult for traditional laboratory methods to accurately detect petroleum hydrocarbon pollutants in soil. Real-time in-situ detection of petroleum hydrocarbon pollutants in soil is an important prerequisite for improving detection speed and accuracy, and can also significantly improve the efficiency of soil remediation and soil surveys. Therefore, there is an urgent need to develop rapid in-situ detection methods for soil petroleum hydrocarbon pollutants.

[0003] Under ultraviolet light, a large number of unsaturated hydrocarbons and their derivatives contained in petroleum hydrocarbons will produce fluorescence. Based on the fluorescence characteristics of petroleum hydrocarbons, many scholars at home and abroad use laser induced fluorescence spectroscopy to detect petroleum hydrocarbons in soil. Laser induced fluorescence technology has the characteristics of rapidity, high sensitivity, and good selectivity, and has become a research hotspot for soil petroleum hydrocarbon detection. The use of laser induced fluorescence technology has obvious advantages, but it also has certain shortcomings, such as high laser requirements, complex detection system, and high maintenance costs, which makes it difficult to achieve system miniaturization and on-site in-situ detection. Utility Model Content

[0004] The technical problem to be solved by the utility model is to solve the problem that the rapid in-situ detection device for soil petroleum hydrocarbon pollutants using laser induced fluorescence technology is large in size.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device comprises an excitation light path device 100, a window 200 and a receiving light path device 300; the window 200 is arranged on the light path of ultraviolet laser emitted by the excitation light path device 100, and the receiving light path device 300 is arranged on the fluorescence path reflected by the window 200; wherein, a folding prism is arranged in both the excitation light path device 100 and the receiving light path device 300, and the total reflection surface of the folding prism serves as the reflection surface of the light path.

[0007] In one embodiment of the present invention, two sets of excitation light path devices 100 are provided; and the two sets of excitation light path devices 100 are symmetrically arranged.

[0008] In one embodiment of the present invention, the excitation light path device 100 includes an LED light source 110, which emits ultraviolet laser, and also includes an excitation light path filter 120, a collimating lens 130 and an excitation light path folding prism 140 arranged in sequence on the ultraviolet laser path.

[0009] In one embodiment of the present invention, two sets of receiving light path devices 300 are provided, and the two sets of receiving light path devices 300 are symmetrically arranged and correspond one-to-one to the two sets of excitation light path devices 100 respectively.

[0010] In one embodiment of the present invention, the receiving light path device 300 includes a first collecting mirror 310, a receiving light path folding prism 320, a receiving light path filter 330, a second collecting mirror 340 and a photomultiplier tube 350 which are sequentially arranged on the reflected fluorescence path.

[0011] In an embodiment of the present invention, in the LED light source 110, a copper substrate is used as a substrate of lamp beads in the LED light source 110, and the heat dissipation pad of the LED light source 110 is connected to the copper substrate.

[0012] In one embodiment of the present invention, the receiving light path deflecting prism 320 deflects the obliquely reflected fluorescence into a parallel light path.

[0013] In one embodiment of the present invention, the excitation light path deflecting prism 140 deflects the parallel incident laser light to illuminate the window 200 at an angle.

[0014] Compared with the prior art, the beneficial effects of the utility model are: the fluorescence excitation light path and the fluorescence light path are folded by a folding prism, the total reflection surface of the folding prism is used as the reflection surface of the light path, the volume of the light path is reduced, and the miniaturization design requirements of the system are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device according to an embodiment of the utility model.

[0016] Figure 2 Schematic diagram of the target spot of the photomultiplier tube according to the embodiment of the utility model. DETAILED DESCRIPTION

[0017] In order to facilitate those skilled in the art to understand the technical solution of the utility model, the technical solution of the utility model is further explained in conjunction with the drawings in the specification.

[0018] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0019] See also Figure 1 As shown, the present invention provides a miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device, comprising an excitation light path device 100, a window 200 and a receiving light path device 300. The window 200 is arranged on the light path of the ultraviolet laser emitted by the excitation light path device 100, and the receiving light path device 300 is arranged on the fluorescence path reflected by the window 200. A folding prism is arranged in both the excitation light path device 100 and the receiving light path device 300, and the total reflection surface of the folding prism serves as the reflection surface of the light path.

[0020] In one embodiment of the utility model, two sets of excitation light path devices 100 are provided, and the two sets of excitation light path devices 100 are symmetrically arranged, and dual light sources are used for excitation. Correspondingly, two sets of receiving light path devices 300 are provided, and the two sets of receiving light path devices 300 are symmetrically arranged and correspond one-to-one to the two sets of excitation light path devices 100 respectively.

[0021] See also Figure 1 As shown, in one embodiment of the present invention, each set of receiving light path device 300 includes a first collecting mirror 310, a receiving light path folding prism 320, a receiving light path filter 330, a second collecting mirror 340 and a photomultiplier tube 350 which are sequentially arranged on the reflected fluorescence path.

[0022] In one embodiment of the utility model, in order to solve the thermal effect of the UV-LED light source, it is necessary to improve the overall heat dissipation capacity of the light source. A copper substrate is used as the substrate of the light source lamp beads. At the same time, a thermoelectric separation design is performed, and the light source heat dissipation pad is directly connected to the copper substrate to make the heat dissipation of the lamp beads faster.

[0023] The LED light source 110 needs to filter stray light, and the excitation light path filter 120 is used to filter the excitation light of the light source to remove the influence of stray light and improve the monochromaticity of the light source. After filtering, the energy of the excitation light will be partially lost. The collimating lens 130 is designed in the fluorescence excitation light path to collimate and focus the excitation light to improve the energy density of the excitation light.

[0024] In one embodiment of the present invention, the excitation light path needs to be folded in consideration of the miniaturization design of the system. Two types of reflectors can be used for the folded light path: a folding prism and a plane reflector. Since the incident angle of the light beam on the reflection surface is large, it is relatively difficult to coat the plane reflector. Therefore, it is considered to use the total reflection surface of the folding prism as the reflection surface. The reflection surface does not need to be coated and has almost no energy loss. The main loss is the transmittance loss of the front and back surfaces. The total reflection surface of the excitation light path folding prism 140 is used as the reflection surface to fold the fluorescence excitation light path, reduce the volume of the light path, and thus meet the requirements of the miniaturization design of the system.

[0025] The excitation light emitted by the excitation light path device 100 illuminates the window 200, forming an elliptical light spot with a diameter of about 6 mm*9 mm on the surface of the soil sample to be tested.

[0026] See also Figure 1 As shown, in one embodiment of the present invention, each receiving light path device 300 includes a first collecting mirror 310, a receiving light path folding prism 320, a receiving light path filter 330, a second collecting mirror 340 and a photomultiplier tube 350 which are sequentially arranged on the reflected fluorescence path.

[0027] In one embodiment of the utility model, the first collecting mirror 310 is used to collect fluorescence. In order to reduce the volume of the optical path, the receiving optical path folding prism 320 folds the fluorescence collected by the first collecting mirror 310, and removes the soil background fluorescence interference through the receiving optical path filter 330 with a central wavelength of 350nm and 380nm. After filtering, the obtained characteristic wavelength fluorescence will be partially attenuated. In order to increase the optical power density of the receiving target surface of the photomultiplier tube 350, the second collecting mirror 340 is used again to converge the fluorescent light beam, and the converged fluorescent light beam is projected to the receiving target surface of the photomultiplier tube 350 to complete the fluorescence collection. The terminal device is connected to the photomultiplier tube 350 to obtain fluorescence data.

[0028] In one embodiment of the present invention, the search area size is about 6 mm. Since the receiving light path is arranged nearly vertically, the search area size can correspond to the photomultiplier tube area one by one. Considering the full reception of the receiving light spot halo, the magnification is about 0.67 times. Since the filter incident requires a small angle, the receiving light path filter 330 is set in the parallel light path.

[0029] See also Figure 1 and Figure 2As shown, in one embodiment of the present invention, when the LED light source 110 is turned on, the deep ultraviolet LED light source provides excitation light of different wavelengths, which is quasi-focused by the collimating lens 130 after the stray light is removed by the excitation light path filter 120, and the light path is turned by the excitation light path refracting prism 140 to reduce the volume of the light path, and finally an elliptical light spot is formed on the surface of the soil sample to be tested on the window 200. The fluorescence generated on the surface of the soil sample to be tested is collected by the first collecting mirror 310, and the receiving light path refracting prism 320 is used to turn the light path to reduce the volume of the light path. The collected fluorescence is filtered by the receiving light path filter 330 to obtain the characteristic wavelength fluorescence of the soil petroleum hydrocarbon pollutants of the specified wavelength, and the fluorescence beam is converged again by the second collecting mirror 340, and finally projected to the receiving target surface of the photomultiplier tube 350 to complete the fluorescence collection.

[0030] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0031] The above-described embodiments merely represent implementation methods of the utility model, and the protection scope of the utility model is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, and all of these belong to the protection scope of the utility model.

Claims

1. A miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device, characterized in that: The invention comprises an excitation light path device (100), a window (200) and a receiving light path device (300); the window (200) is arranged on the light path of ultraviolet laser emitted by the excitation light path device (100), and the receiving light path device (300) is arranged on the path of fluorescence reflected by the window (200); wherein a folding prism is arranged in both the excitation light path device (100) and the receiving light path device (300), and the total reflection surface of the folding prism serves as the reflection surface of the light path.

2. The miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device according to claim 1 is characterized in that: Two sets of excitation light path devices (100) are provided; and the two sets of excitation light path devices (100) are symmetrically arranged.

3. The miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device according to claim 1 is characterized in that: The excitation light path device (100) comprises an LED light source (110) which emits ultraviolet laser light, and also comprises an excitation light path filter (120), a collimating lens (130) and an excitation light path folding prism (140) which are sequentially arranged on the ultraviolet laser path.

4. The miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device according to claim 2 is characterized in that: Two sets of receiving optical path devices (300) are provided, and the two sets of receiving optical path devices (300) are symmetrically arranged and correspond one-to-one to the two sets of excitation optical path devices (100).

5. The miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device according to claim 1 is characterized in that: The receiving light path device (300) comprises a first collecting mirror (310), a receiving light path folding prism (320), a receiving light path filter (330), a second collecting mirror (340) and a photomultiplier tube (350) which are sequentially arranged on the reflected fluorescence path.

6. The miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device according to claim 3 is characterized in that: In the LED light source (110), a copper substrate is used as a substrate for lamp beads in the LED light source (110), and a heat dissipation pad of the LED light source (110) is connected to the copper substrate.

7. The miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device according to claim 5 is characterized in that: The receiving light path deflecting prism (320) deflects the obliquely reflected fluorescence into a parallel light path.

8. The miniaturized soil petroleum hydrocarbon pollutant fluorescence detection device according to claim 3 is characterized in that: The excitation light path deflecting prism (140) deflects the parallel incident laser light to obliquely illuminate the window (200).

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