CN209841680U

CN209841680U - Photoelectric conversion system

Info

Publication number: CN209841680U
Application number: CN201920519710.3U
Authority: CN
Inventors: 闾传明; 付正建; 付永恒
Original assignee: Wuxi Se Na Instrument Equipment Manufacturing Co Ltd
Current assignee: Wuxi Se Na Instrument Equipment Manufacturing Co Ltd
Priority date: 2019-04-16
Filing date: 2019-04-16
Publication date: 2019-12-24
Anticipated expiration: 2029-04-16

Abstract

The utility model discloses a photoelectric conversion system, including the diaphragm, the light inlet end at the mount pad is installed to the diaphragm, the condenser lens is installed to the light-emitting end of mount pad, be equipped with on the mount pad and supply to pass through the light incidence of diaphragm first light channel on the condenser lens, the light-emitting side fixed connection light path cover of mount pad, the light path cover is equipped with the second light channel, the light-emitting side fixed mounting who light path cover connects the light sleeve, connect the light sleeve to be equipped with the third light channel, install analog signal amplification circuit board in the third light channel that connects the light sleeve, install the silicon photocell that is used for receiving focus light on the analog signal amplification circuit board, the focus setting of condenser lens is in on the photosurface of silicon photocell, still install on the mount pad with the light path cover connect the thermal-insulated shroud that the light sleeve all covered. The utility model discloses can realize the detection to weak light signal, detectivity is high, stability is high, and the cost is lower.

Description

Photoelectric conversion system

Technical Field

The utility model relates to an evaporation light scattering detector's light signal detecting element, concretely relates to photoelectric conversion system.

Background

Most of the existing evaporative light scattering detectors in the market use high-price photomultiplier tubes which need to be imported as optical signal detection elements of the evaporative light scattering detectors, the cost of the photomultiplier tubes is extremely high, only one part accounts for about 60% of the raw material cost of the evaporative light scattering detectors, and therefore the price of the existing evaporative light scattering detectors in the market is high, and the competitive advantage of domestic manufacturers is reduced.

At present, the evaporative light scattering detector adopting other photoelectric detection elements in the market is not limited to a silicon photocell, but the evaporative light scattering detector using the detection element often cannot meet the requirement of the lowest detection limit (namely the lowest detectable sample concentration) required by the state, and has the defects of poor stability, high noise and the like, mainly because the silicon photocell has very low sensitivity and needs high-gain electric signal amplification, and the problems of high noise and poor stability are caused.

SUMMERY OF THE UTILITY MODEL

In view of the not enough of background art, the utility model provides a photoelectric conversion system, the technical problem that solve is how to realize the accurate detection to weak light signal to guarantee the sensitivity and the stability of detection.

For solving the technical problem, the utility model provides a following technical scheme:

photoelectric conversion system, including the diaphragm, the light inlet end at the mount pad is installed to the diaphragm, the condenser lens is installed to the light-emitting end of mount pad, be equipped with on the mount pad and supply to pass through the light incidence of diaphragm the first light path on the condenser lens, the light-emitting side fixed connection light path cover of mount pad, the light path cover is equipped with the second light path, the light-emitting side fixed mounting of light path cover connects the light sleeve, connect the light sleeve to be equipped with the third light path, install analog signal amplification circuit board in the third light path of light sleeve, install the silicon photocell that is used for receiving focus light on the analog signal amplification circuit board, the focus setting of condenser lens is in on silicon photocell's the photosurface, still install on the mount pad will the light path cover the thermal shroud that connects the light sleeve and all cover.

The diaphragm is of an annular structure, and the edge of an inner ring of the light inlet end of the diaphragm is provided with a 30-degree chamfer.

The condensing lens is of an eyeball bionic structure.

The body of the condensing lens is designed to be cylindrical, and the light inlet end and the light outlet end of the body are both designed to be spherical surfaces protruding towards the light emission direction.

The mounting seat is provided with a first heat insulation ring at the light outlet end of the first light passage, the light path sleeve is provided with a second heat insulation ring at the light inlet end of the second light passage, and the condensing lens is pressed between the first heat insulation ring and the second heat insulation ring.

The light path sleeve is provided with a plurality of first threaded holes along the radial direction, second threaded holes corresponding to the first threaded holes are formed in the light path sleeve, and the first threaded holes are connected with the second threaded holes through screws.

The peripheral wall of the third light passage of the light receiving sleeve is of a threaded structure.

And the analog signal amplification circuit board is provided with a signal interface and a power interface.

The diaphragm, the first heat insulation ring, the second heat insulation ring and the heat insulation cover are all made of polytetrafluoroethylene materials.

Compared with the prior art, the utility model beneficial effect who has is: the utility model gets rid of the dependence on the imported photomultiplier, can realize the accurate detection of the weak light signal through the combination of the condensing lens, the light diaphragm for filtering the stray light, the analog signal amplifying circuit board for amplifying the weak voltage signal with high fidelity, and the heat insulation and preservation function of the heat shield, has the advantages of low cost, high detection sensitivity, high stability, simple structure, getting rid of the restriction of imported parts and the like,the laboratory actual measurement result exceeds the national minimum detection limit requirement, simultaneously the noise level and the stability index exceed the national standard, and concretely, the GB requires that the minimum detection concentration of the evaporative light scattering detector is less than or equal to 5 multiplied by 10^-6g/mL cholesterol methanol solution, the highest value of the cholesterol methanol solution can reach less than or equal to 5 multiplied by 10 in the laboratory test of the invention^-8g/mL cholesterol in methanol.

Drawings

The utility model discloses there is following figure:

fig. 1 is an explosion diagram of the present invention.

Detailed Description

As shown in the figure, this kind of photoelectric conversion system, including diaphragm 1, the light inlet end at mount pad 2 is installed to diaphragm 1, mainly used filters the stray light in the scattered light that detects the sample, and make its non-stray light get into, condensing lens 3 is installed to the light outlet end of mount pad 2, in this embodiment, in order to carry out effective spotlight to the light, realize better light concentration effect, set condensing lens 3 into eyeball bionic structure, specifically, condensing lens 3's body is established to cylindricly, and the light inlet end and the light outlet end of body all establish to the convex sphere of light emission direction, in this embodiment, this kind of structure will effectively improve the intensity of light, and improve the filter effect to the parasitic light. The mounting seat 2 is provided with a first light passage 21 for light passing through the diaphragm 1 to enter the condensing lens 3, the light outlet side of the mounting seat 2 is fixedly connected with a light path sleeve 4, the light path sleeve 4 is provided with a second light passage 41, the light outlet side of the light path sleeve 4 is fixedly provided with a light receiving sleeve 5, the light receiving sleeve 5 is provided with a third light passage 51, the first light passage 21, the second light passage 41 and the third light passage 51 are all used for transmitting light, an analog signal amplifying circuit board 6 is arranged in the third light passage 51 of the light receiving sleeve 5, a silicon photocell 7 for receiving focusing light is arranged on the analog signal amplifying circuit board 6, the focus of the condensing lens 3 is arranged on the photosensitive surface of the silicon photocell 7 to realize the technical effect of detecting weak light signals accurately and sensitively, the mounting seat 2 is also provided with a heat insulation cover 8 for covering the light path sleeve 4 and the light receiving sleeve 5, the heat insulation cover 8 has good heat insulation effect, the influence of temperature change on detection stability can be eliminated.

In this embodiment, the diaphragm 1 is a ring structure, and the inner ring edge of the light inlet end of the diaphragm 1 is provided with a 30 ° chamfer. The structure can better filter stray light in scattered light of a detected sample, so that non-stray light passes through the inner hole of the diaphragm.

In this embodiment, the first heat insulation ring 9 is installed at the light outlet end of the first light passage 21 by the installation base 2, the second heat insulation ring 10 is installed at the light inlet end of the second light passage 41 by the light path sleeve 4, the condensing lens 3 is pressed between the first heat insulation ring 9 and the second heat insulation ring 10, the first heat insulation ring 9 and the second heat insulation ring 10 both have good heat insulation effect, and can firmly fix the condensing lens 3 to prevent the condensing lens 3 from shaking, and meanwhile, the service life of the condensing lens 3 is also prolonged, and the condensing effect is ensured.

In this embodiment, the mounting base 2 is provided with a plurality of first threaded holes 22 along a radial direction, the optical path sleeve 4 is provided with a second threaded hole 42 corresponding to the first threaded hole 22, and the first threaded hole 22 is connected with the second threaded hole 42 by a screw, so as to achieve the effect of fixing and connecting the two.

In this embodiment, the peripheral wall of the third light path 51 of the light receiving sleeve 5 is a threaded structure and is made of aluminum material by finish machining, and this structure has good shielding effect against external interference and good strength, and can ensure the stability and sensitivity of detection.

In this embodiment, the analog signal amplifying circuit board 6 is provided with a signal interface and a power interface, and this structure facilitates connection of the analog signal amplifying circuit board 6 with other devices.

In this embodiment, to achieve a good heat insulation effect, the diaphragm 1, the first heat insulation ring 9, the second heat insulation ring 10 and the heat insulation cover 8 are all made of teflon, because teflon has a good high temperature resistance.

The working principle of the embodiment is as follows: when the liquid chromatography pump is in an emptying working state, the scattered light of the detected sample enters in the weak light entering direction of the embodiment, the scattered light is filtered by the diaphragm 1, so that non-stray light passes through an inner hole of the diaphragm 1, then passes through a first light passage 21 of the mounting seat 2 and is irradiated on the condenser lens 3, the condenser lens 3 refracts the non-stray light, the non-stray light in the refraction passes through a second light passage 41 and a third light passage 51 in sequence and is finally focused on a photosensitive surface of the silicon photocell 7, then the silicon photocell 7 converts the received optical signal into an electric signal, the signal is amplified by the analog signal amplifying circuit 6, the amplified signal is transmitted to a main board in the evaporative light scattering detector through a signal wire to be subjected to analog-to-digital conversion, and the signal is transmitted to a PC end through a data wire and is subjected to data analysis by a chromatographic workstation at the PC end.

In conclusion, the embodiment can realize accurate detection of the weak optical signal, and has the characteristics of low cost, high detection sensitivity, high stability, simple structure, capability of getting rid of the restriction of imported parts and the like.

Claims

1. A photoelectric conversion system characterized in that: including the diaphragm, the light end is installed at the light of advancing of mount pad to the diaphragm, condenser lens is installed to the light-emitting end of mount pad, be equipped with on the mount pad and supply to pass through the light of diaphragm incides first light path on the condenser lens, the light-emitting side fixed connection light path cover of mount pad, the light path cover is equipped with the second light path, the light-emitting side fixed mounting of light path cover connects the light sleeve, connect the light sleeve to be equipped with the third light path, install analog signal amplification circuit board in the third light path of light sleeve, install the silicon photocell that is used for receiving focus light on the analog signal amplification circuit board, the focus setting of condenser lens is in on the photosurface of silicon photocell, still install on the mount pad with the light path cover the thermal shroud that connects the light sleeve to cover all covers.

2. The photoelectric conversion system according to claim 1, wherein: the diaphragm is of an annular structure, and the edge of an inner ring of the light inlet end of the diaphragm is provided with a 30-degree chamfer.

3. The photoelectric conversion system according to claim 1, wherein: the condensing lens is of an eyeball bionic structure.

4. The photoelectric conversion system according to claim 3, wherein: the body of the condensing lens is designed to be cylindrical, and the light inlet end and the light outlet end of the body are both designed to be spherical surfaces protruding towards the light emission direction.

5. The photoelectric conversion system according to claim 1, wherein: the mounting seat is provided with a first heat insulation ring at the light outlet end of the first light passage, the light path sleeve is provided with a second heat insulation ring at the light inlet end of the second light passage, and the condensing lens is pressed between the first heat insulation ring and the second heat insulation ring.

6. The photoelectric conversion system according to claim 1, wherein: the light path sleeve is provided with a plurality of first threaded holes along the radial direction, second threaded holes corresponding to the first threaded holes are formed in the light path sleeve, and the first threaded holes are connected with the second threaded holes through screws.

7. The photoelectric conversion system according to claim 1, wherein: the peripheral wall of the third light passage of the light receiving sleeve is of a threaded structure.

8. The photoelectric conversion system according to claim 5, wherein: the diaphragm, the first heat insulation ring, the second heat insulation ring and the heat insulation cover are all made of polytetrafluoroethylene materials.