CN2430682Y

CN2430682Y - High sensitive photometer

Info

Publication number: CN2430682Y
Application number: CN 99254233
Authority: CN
Inventors: 金钦汉; 陈焕文; 曹彦波; 梁枫
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-11-18
Filing date: 1999-11-18
Publication date: 2001-05-16
Anticipated expiration: 2009-11-18

Abstract

The utility model relates to a photometer with high sensitivity, good precision, low detection limits, compact, steady and reliable structure, small volume, light weight and wide application ranges. The utility model comprises a power supply, a light source, lenses, a detector and a display screen. The utility model is also provided with a liquid core waveguide which is served as an absorption cell and is arranged between the two lenses, and two ports are respectively positioned on a respective focal plane of the two lenses. The detector is connected with a magnifying and reading device and the display screen through a circuit, and test results of the detector are displayed on the display screen.

Description

Highly sensitive photometer

The utility model relates to a kind of analytical instrument, and is concrete, relates to a kind of novel photometer.

Spectrophotometric method from 19th-century be born beginning just because of its have simple and convenient, the scope of application is wide, sensitivity has obtained widespread use than characteristics such as height, is the long and vigorous analysis determining method of vitality of a kind of history.According to incompletely statistics, in China present stage, to large-scale Institute of Analysis, almost all being equipped with the spectrophotometer that quantity does not wait from the basic unit assay laboratory bar none, is the maximum analytical instrument of present user.In addition, according to the incomplete statistics over nearly 3 years, in the paper of delivering on national standard that the inorganic analysis aspect is newly issued and the leading publication, photometric analysis accounts for 1/3rd, and the article that relates to photometric analysis in the organic analysis also accounts for certain share.This shows that spectrophotometric method is still occupied crucial status in analytical chemistry.

Closely for decades, progress and expanding economy along with science and technology, analytical chemistry has also run into new challenge, this mainly shows: 1, from want analytical test components contents, significantly trend be from constant to trace, trace even unimolecule, atomic transition, the determinand content that promptly will survey is more and more lower; 2,, transferred to gradually and comprised bioactivator at interior complex molecule or group from simple ion, element from the component of want analytical test.Promptly require to do morphological analysis, even requirement can provide the comprehensive morphological analysis of atom and molecular information simultaneously; 3, from analysis task, require more and more to do on-the site analysis, on-line analysis, original position analysis and even in-vivo analysis; 4, from used analysis test method, the employed instrument of various instrument analytical methods is walked out the laboratory gradually all in miniaturization, microminiaturization, becomes ordinary people's instrument, promptly popular (democratization).Under this trend, carry out high sensitivity, high precision, volume little, in light weight, low in energy consumption, can detect simple ion again can the detection of complex molecule and also the development of the novel analytical instrument of economic and reliable be very necessary, have great social economic value and learning value.

The present widely used spectrophotometer of China is through the development of 721 types to 751 types of associating, though its function has obtained improving and has improved, but still come with some shortcomings, this mainly shows: 1, adopt short light path and absorbance measuring pattern, limited the further raising of its sensitivity; 2, adopt tungsten lamp to make light source, the intensity of light source is not really stable, makes that its precision is lower; 3, volume is bigger and not light, is difficult to use in on-the site analysis; 4, adopt the mechanical scanning type beam splitting system, this system price is higher but fragile structure and stability are not good, makes that the measurement result deviation is bigger; 5, since light intensity a little less than, can only use price higher detection devices such as photoelectric tube; 6, price of complete machine is higher, can't adapt to popular trend.Obviously, this traditional spectrophotometer can't satisfy the needs of modern analysis chemical developer.

At the problems referred to above, the purpose of this utility model provide a kind of highly sensitive, precision good, detection limit is low, compact conformation and solid and reliable, volume is little and deal is light, the novel photometer that has wide range of applications.

For achieving the above object, the utility model is taked following design:

Novel highly sensitive photometer of the present utility model comprises power supply, light source, lens and detecting device, display screen, it is characterized in that: realize the wavelength selection by changing light source.

Above-mentioned highly sensitive photometer also is provided with a liquid core light guide as absorption cell, and its two-port lays respectively on the middle focal plane separately of two lens; Described light source is an intense light source.

Above-mentioned highly sensitive photometer, described detecting device connects an amplification and reading device and display screen by circuit, and measurement result shows on display screen, easily reading.

Above-mentioned highly sensitive photometer, described intense light source can be light emitting diode, high-intensity laser instrument or integrated light-emitting diode (LED) or led array.

Above-mentioned highly sensitive photometer, described detecting device can be phototriode or photoelectric tube, photomultiplier.

Above-mentioned highly sensitive photometer, described liquid core light guide one end lens can replace with a glass injector.

Above-mentioned highly sensitive photometer, described glass injector is L shaped glass tube, the junction of its vertical tube and horizontal tube is the bulbous protrusion of evagination.

Above-mentioned highly sensitive photometer can be made the hand-held photometer, is advantageously used in on-the site analysis.

Above-mentioned highly sensitive photometer, weight is no more than 1kg, and volume is no more than 1L.

The utility model has adopted the multiple cutting edge technology that occurs recently, makes the utility model photometer have following characteristics: 1, adopt extraordinary light emitting diode or integrated LED or led array to make light source, light intensity is stablized greatly; 2, complete machine does not have movable member, not only compact conformation but also solid and reliable; 3, adopt liquid core light guide to make absorption cell, its light path prolongs greatly so that can reach more than the hundreds of centimetre; 4, can adopt phototriode or photoelectric tube, photomultiplier etc. to make detecting device; 5, adopt the two kinds of measurement patterns of difference or wherein a kind of the measurement and deal with data of absorbance and transmitance simultaneously, can obtain higher sensitivity and wideer dynamic linear scope.

Effect of the present invention mainly contains: 1, the traditional high several magnitude of spectrophotometer of remolding sensitivity; To survey phosphorus is example: traditional spectrophotometer is limited to 5ppb to detecting of P; Under the condition that adopts Δ I measurement pattern and 15cm absorption cell, spectrophotometer of the present invention is limited to 0.05ppt to detecting of P, compares with traditional spectrophotometer, and detection limit hangs down 5 orders of magnitude.2, precision and detection limit all are better than existing various spectrophotometer, and relative deviation is less than 2%; 3, volume is little, and is in light weight, and sample weight machine is no more than 2 kilograms, and the about 0.5-1 kilogram of commercial instrument can be made handheld instrument; And traditional spectrophotometer weighs tens kilograms, is not easy to carry, and more can not make handheld instrument.4, can be advantageously used in on-the site analysis; 5, wide dynamic range; The big at least several magnitude of the more traditional spectrophotometer of its range of linearity.6, because of cost is lower, can reduce the price of commercial instrument greatly, make individual's (comprising the peasant) also have the ability fully to buy; 7, except the mensuration that can be used for general inorganic and organic component, can also be used for the assay determination of bioactivator complex components such as (as albumin); 8, the tolerance to environment is better than other spectrophotometer, makes it to work under worse environment and has longer serviceable life.And traditional spectrophotometer is because poorly sealed and have movable member, and environment is bigger to its influence, and lack than spectrophotometer of the present invention serviceable life.

The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment.

Fig. 1 is the utility model internal optics component locations structural representation;

Fig. 2 is the utility model schematic appearance;

Fig. 3 is the utility model embodiment liquid core waveguide shape synoptic diagram.

Photometer of the present utility model is traditional spectrophotometric improvement and innovation, and its inner formation is different from traditional spectrophotometer.A kind of embodiment of the present utility model is please referring to Fig. 1 and Fig. 2, Fig. 1 illustrates the utility model internal optics position component structure: light source (S) 1 provides the light of sufficient intensity for one-piece construction, behind lens (L) 2, focus on an end of liquid core waveguide (LCW) 3, light comes out from the other end by behind the liquid core waveguide 3, and after seeing through lens (L) 4, focus on the detecting device (D) 5, behind amplification and reading device (R) 6, on display screen, show testing result.Above-mentioned light source 1 is preferably light emitting diode, high-intensity laser instrument or integrated light-emitting diode (LED) or led array; Described detecting device 5 can be phototriode or photoelectric tube, photomultiplier; Multiplying arrangement can adopt logarithm amplification or common amplification respectively or adopt two kinds of amplification systems simultaneously, so that carry out the selection of measurement pattern easily; Reading device can be digital or the dial type display device, preferably uses liquid crystal indicator;

Fig. 2 is a kind of schematic appearance of specific embodiment, and the instrument upper part has mainly been concentrated the electric component of instrument among the figure, comprises power supply, control chip, detecting device and switch etc., and they connect with the circuit of routine, do not describe in detail at this; Be convenient and use that at instrument in appearance, be provided with a display screen with the clear testing result that shows, a power switch uses with control, a zero-setting button with zeroing and a mode selection switch to carry out the selection of measurement pattern; Be convenient open-air the use, power supply also can be battery; The instrument lower part has mainly been concentrated the optics of instrument among the figure, they press the positional structure arrangement of Fig. 1 respectively, wherein, on the shell of instrument, establish injection port and waste liquid mouth, they are plastic flexible pipe, the flexible pipe internal orifice is connected with the two ends of liquid core waveguide 3 respectively, and fluid to be measured enters liquid core waveguide 3 by injection port, and liquid core waveguide 3 promptly is equivalent to absorption cell.

With reference to accompanying drawing in detail a kind of embodiment of the present utility model has been described in detail above, wherein the liquid core waveguide of Cai Yonging can be buied from the market.Provide the liquid core waveguide of another shape below, see also Fig. 3, it is a kind of glass injector, and the glass injector is L shaped glass tube, and the junction of its vertical arm 31 and horizontal tube 32 is the bulbous protrusion of evagination.Injection port flexible pipe among Fig. 2 links to each other with the arm of glass injector.

Above-mentioned utility model can be used like this: behind the opening power connection light source etc., select measurement pattern, advance blank solution from injection port, regulate zero point; Advance standard solution, reading and drawing standard curve; Behind blank solution cleaning liquid core waveguide, advance solution to be measured, reading; Find test substance content from typical curve.

The embodiment that provides above and the using method of instrument only for clearly demonstrating the technical solution of the utility model, are not limited to the utility model; Any other equivalent arrangements of having done according to technical solutions of the utility model are the utility model comprise and disclosed content.

Claims

1, a kind of highly sensitive photometer comprises power supply, light source, lens and detecting device, display screen, it is characterized in that: realize the wavelength selection by changing light source.

2, according to the highly sensitive photometer of claim 1, it is characterized in that: a liquid core light guide as absorption cell also is set, and its two-port lays respectively on the middle focal plane separately of two lens; Described light source is an intense light source.

3, according to the highly sensitive photometer of claim 1, it is characterized in that: described detecting device connects an amplification and reading device and display screen by circuit, and measurement result shows on display screen, easily reading.

4, according to the highly sensitive photometer of claim 1, it is characterized in that: described intense light source can be light emitting diode, high-intensity laser instrument or integrated light-emitting diode (LED) or led array.

5, according to the highly sensitive photometer of claim 1, it is characterized in that: described detecting device can be phototriode or photoelectric tube, photomultiplier.

6, according to the highly sensitive photometer of claim 1, it is characterized in that: described liquid core light guide one end lens can replace with a glass injector.

7, according to the highly sensitive photometer of claim 6, it is characterized in that: described glass injector is L shaped glass tube, and the junction of its vertical tube and horizontal tube is the bulbous protrusion of evagination.

8, according to each described highly sensitive photometer of claim 1-7, it is characterized in that: can make the hand-held photometer, be advantageously used in on-the site analysis.

9, highly sensitive photometer according to Claim 8, it is characterized in that: weight is no more than 1kg, and volume is no more than 1L.