CN105021571A - Refractive densitometer optical system - Google Patents

Abstract

The present invention discloses a refractive densitometer optical system, the optical system comprises a light source, a prism system, a collimator system and a detection system, after light emitted from the light source passes through the prism system, and part of the light beams are totally emitted into the collimator system for convergence into a parallel light to enter into thesubsequent detection system. The refractive densitometer optical system has the following advantages: 1, a catadioptric structure is used, the light beams passing through the prism system are parallel light, and a far distance between the optical portion and the detection system can be achieved; the detection system can be protected to a certain extent aiming at measurement of a high temperature liquid; 2, the optical portion of the system comprises a prism and a lens, and has the advantages of simple structure and convenient assembling and adjusting; and 3, the system takes cost-glass glass design, and low cost mass production can be achieved.

Description

A kind of optical system of refractive power densimeter

Technical field

The invention belongs to Optical System Design field, relate to a kind of optical system of refractive power densimeter.

Background technology

Solution concentration is an important measuring parameter in scientific research and field of industrial production.Current method of testing is mainly divided into following several: 1, hydrometer method.The method needs to measure by sampling in sample, complex operation, and efficiency is low, cannot monitor solution concentration change in real time.2, inertia depth meter method.The measurement mechanism complex structure of the method, requirement for environmental conditions is higher; And take the refractive power densimeter of refraction principle to have easy and simple to handle, precision is higher, and structure is simple, can monitor the advantage of solution concentration change in real time.Optical system is as the core of refractive power densimeter, and the optical system therefore studying refractive power densimeter has important practical significance.

Summary of the invention

The object of this invention is to provide a kind of optical system of refractive power densimeter, this optical system has features simple structure, compact dimensions, advantage with low cost.

The object of the invention is to be achieved through the following technical solutions:

A kind of optical system of refractive power densimeter, be made up of light source, prism system, colimated light system, detection system, the light that light source sends is after prism system, and a part of light beam full transmitting occurs and enters into colimated light system and be converged to directional light and enter follow-up detection system.

In the present invention, described light source adopts LED light source, and operation wavelength is 589nm.

In the present invention, the emission angle of described light source is applicable to ± and 5 ° ~ ± 15 °.

In the present invention, the light that described light source sends is from incident near light source of prism, and penetrate near the limit, one side of colimated light system, incident angle is normal incidence.

In the present invention, described prism system adopts the material of Nd=1.52, Vd=64.2 to make.

In the present invention, described colimated light system takes monolithic high order aspheric surface lens, and its asphericity coefficient should meet following formula:

$z=\frac{{\mathrm{cy}}^2}{1+{\[1-(1+k)c^2{y}^2\]}^{1/2}}+{\mathrm{Dy}}^4+{\mathrm{Ey}}^6+{\mathrm{Fy}}^8+{\mathrm{Gy}}^{10}+{\mathrm{Hy}}^{12}+{\mathrm{Iy}}^{14},$

Wherein: z is aspheric surface rise in the direction of the optical axis, and c is the radius-of-curvature on aspheric surface summit, and k is secondry constants, and y is axial distance, at least one is non-vanishing for asphericity coefficient D, E, F, G, H, I.

In the present invention, in described detection system, take line array CCD as detecting element.

In the present invention, described line array CCD Pixel size 14.4 μm, pixel quantity is 1024.

Tool of the present invention has the following advantages:

1, have employed refraction-reflection type structure, the light beam after colimated light system is directional light, can accomplish that opticator and detection system keep larger distance.Measurement for high-temp liquid can play protective effect to a certain extent to detection system.

2, native system opticator is made up of prism and a slice lens, have structure simple, debug advantage easily.

3, native system takes low cost Glass Design, can accomplish that low cost is produced in batches.

Accompanying drawing explanation

Fig. 1 is principle of work schematic diagram, in figure: 1 is light source, and 2 is prism system, and 3 is colimated light system, and 4 is detection system;

Fig. 2 is colimated light system eyeglass schematic diagram, in figure: d is the center thickness of lens, and R1 is lens front surface radius-of-curvature, and R2 is lens rear surface radius-of-curvature.

Embodiment

Below in conjunction with accompanying drawing, technical scheme of the present invention is further described; but be not limited thereto; everyly technical solution of the present invention modified or equivalent to replace, and not departing from the spirit and scope of technical solution of the present invention, all should be encompassed in protection scope of the present invention.

Refractive power densimeter optical system provided by the invention mainly comprises following four parts: 1-light source, 2-prism system, 3-colimated light system, 4-detection system.

Refractometer utilizes light in the catadioptric of solution interface, detects the refractive index of solution, thus measure the instrument of its concentration value by measuring the cirtical angle of total reflection.As shown in Figure 1, in work, the surface A of prism system 2 contacts with surveyed solution.The light beam that LED light source 1 is launched enters prism system 2, is totally reflected in the surface A generating portion of prism system 2, and a part of light occurring entirely to launch enters in detection system 4 after entering follow-up colimated light system 3 collimation.Record the marginal position of catadioptric by detection system 4, realize the measurement to detected solution refractive index.The eyeglass data of collimating module are as shown in table 1.

The eyeglass data of table 1 collimating module

d

R1

R2

D

E

F

G

H

I

3mm

∞

-248.060mm

0.015

0.0000006824

0

0

0

0

Claims (8)

1. the optical system of a refractive power densimeter, it is characterized in that described optical system is made up of light source, prism system, colimated light system, detection system, the light that light source sends is after prism system, and a part of light beam full transmitting occurs and enters into colimated light system and be converged to directional light and enter follow-up detection system.

2. the optical system of refractive power densimeter according to claim 1, it is characterized in that described light source adopts LED light source, operation wavelength is 589nm.

3. the optical system of refractive power densimeter according to claim 1 and 2, it is characterized in that the emission angle of described light source be applicable to ± 5 ° ~ ± 15 °.

4. the optical system of refractive power densimeter according to claim 1, is characterized in that described prism system adopts the material of Nd=1.52, Vd=64.2 to make.

5. the optical system of refractive power densimeter according to claim 1, is characterized in that described colimated light system is monolithic high order aspheric surface lens.

6. the optical system of refractive power densimeter according to claim 5, is characterized in that the asphericity coefficient of described monolithic high order aspheric surface lens should meet following formula:

$z=\frac{{\mathrm{cy}}^2}{1+{\[1-(1+k)c^2{y}^2\]}^{1/2}}+{\mathrm{Dy}}^4+{\mathrm{Ey}}^6+{\mathrm{Fy}}^8+{\mathrm{Gy}}^{10}+{\mathrm{Hy}}^{12}+{\mathrm{Iy}}^{14},$

Wherein: z is aspheric surface rise in the direction of the optical axis, and c is the radius-of-curvature on aspheric surface summit, and k is secondry constants, and y is axial distance, at least one is non-vanishing for asphericity coefficient D, E, F, G, H, I.

7. the optical system of refractive power densimeter according to claim 1, is characterized in that taking line array CCD as detecting element in described detection system.

8. the optical system of refractive power densimeter according to claim 7, is characterized in that described line array CCD Pixel size 14.4 μm, and pixel quantity is 1024.