CN115343191A - Density refraction integrated instrument - Google Patents

Abstract

The density and refraction integrating instrument includes density measuring module and refractive index measuring module, and can measure the refractive index and density simultaneously. Meanwhile, the high-refractive index prism sample groove component can realize simultaneous sample introduction of the refraction and density measurement parts.

Description

Density refraction integrated instrument

Technical Field

The invention belongs to the technical field of material analysis instruments, and particularly relates to a density and refraction integrated instrument.

Background

The densitometer is an instrument for measuring the density of liquid, the density of the liquid is one of important physical properties of the liquid, the density method is one of detection methods commonly used in food analysis and food safety detection, and the purity, the doping condition and the like of the quality can be known by the density. With the development of science and technology, rapid measurement of density is widely used in many fields.

Refractometer is an instrument for measuring the refractive index of a substance, and the concentration, content, purity and the like of the substance can be analyzed and determined through measuring the refractive index. The method is widely applied to sugar manufacturing, pharmacy, petroleum, food, chemical industry and other industrial departments, and related colleges and universities and scientific research units.

With the development of the industry, more and more raw materials in the industry need to be detected and analyzed by a refractometer and a densitometer at the same time. The refractometer and the densitometer on the market are two independent instruments, and no instrument on the market can analyze the components of a substance by utilizing the refractive index and the density of the substance at the same time, or even if a combined device integrating the two instruments is provided, the volume of the combined device is very large due to the integration of the two instruments, and the operation and the carrying are inconvenient.

Disclosure of Invention

The invention aims to solve the problems that the raw materials of more and more industries on the market need to be detected and analyzed by using a refractometer and a densimeter, and provides a density-refractometer all-in-one instrument which can simultaneously measure the refractive index and the density, has small volume and high precision.

Technical scheme

In order to achieve the technical purpose, the invention provides a density-refraction integrated instrument, which comprises a density measuring module and a refractive index measuring module, and is characterized in that: the density measurement module comprises a U-shaped glass cuvette, an inlet end and an outlet end of the U-shaped glass cuvette are fixedly arranged on a U-shaped glass cuvette mounting seat, a piezoelectric displacer is arranged on the U-shaped glass cuvette mounting seat, the piezoelectric displacer can excite the U-shaped glass cuvette mounting seat to vibrate, a first condensing lens is arranged on an emergent light path of an LED light source, white light emitted by the LED light source is changed into parallel light through the first condensing lens to be emitted and then irradiates a measured sample at the bottom of the U-shaped glass cuvette, light rays which are partially shielded and absorbed by the measured sample are focused on a photosensitive surface of an area array CCD through an imaging lens, and the inlet end and the outlet end of the U-shaped glass cuvette are connected to the refractive index measurement module;

the refractive index measurement module comprises a high-refractive index prism sample groove, a refraction sample inlet and a refraction sample outlet are formed in the high-refractive index prism sample groove, a condensing lens II is arranged on an emergent light path of the monochromatic LED light source, monochromatic light emitted by the monochromatic LED light source is imaged on the contact surface of the high-refractive index prism sample groove and a measured sample through the condensing lens II, a total reflection phenomenon is generated, and a reflection image finally irradiates on a sensitive surface of the linear array CCD collection system.

Further, the inlet end and the outlet end of the U-shaped glass cuvette are arranged in the high-refractive-index prism sample groove.

Further, the monochromatic LED light source and the linear array CCD acquisition system are connected with and controlled by the ARM controller.

Advantageous effects

Compared with the existing refractometer and densitometer for detecting and analyzing products, the density refractometer provided by the invention has the following advantages:

(1) The special optical system for the automatic density refraction integrating instrument can measure the refractive index and the density simultaneously, and has the advantages of small volume, no moving part and long service life.

(2) The high-refractive index prism sample groove component can realize simultaneous sample injection of refraction and density measurement parts.

Drawings

FIG. 1 is a schematic diagram of the optical path in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a refractive index measurement module in an embodiment of the invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "inner", "outer", "front", "rear", "left", "right", "general side", "standby side", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention is described in further detail below by means of specific embodiments and with reference to the attached drawings.

Examples

As shown in the attached drawing 1, the density refraction all-in-one instrument comprises a density measurement module a and a refractive index measurement module b, wherein the density measurement module a comprises a U-shaped glass cuvette 1, an inlet end 101 and an outlet end 102 of the U-shaped glass cuvette 1 are fixedly arranged on a U-shaped glass cuvette mounting seat 2, a piezoelectric displacer 3 is arranged on the U-shaped glass cuvette mounting seat 2, the piezoelectric displacer 3 can excite the U-shaped glass cuvette mounting seat 2 to vibrate, a condensing lens 5 is arranged on an emergent light path of an LED light source 4, white light emitted by the LED light source 4 is changed into parallel light through the condensing lens 5 to be emitted and then irradiates on a measured sample 6 at the bottom of the U-shaped glass cuvette 1, the light after being partially shielded and absorbed by the measured sample 6 is focused on a photosensitive surface of an area array CCD8 through an imaging lens 7, and an image of the U-shaped glass tube is obtained through a data acquisition system and is used for detecting bubbles and impurities in the U-shaped tube during sample loading. The inlet end 101 and the outlet end 102 of the U-shaped glass cuvette 1 are connected to the refractive index measurement module b;

the refractive index measuring module b comprises a high refractive index prism sample groove 9, a refraction sample inlet 901 and a refraction sample outlet 902 are arranged on the high refractive index prism sample groove 9, a condensing lens II 10 is arranged on an emergent light path of the monochromatic LED light source 12, monochromatic light emitted by the monochromatic LED light source 12 is imaged on a contact surface of the high refractive index prism sample groove 9 and the sample 6 to be measured through the condensing lens II 10 to generate a total reflection phenomenon, and a reflected image finally irradiates on a sensitive surface of the linear array CCD collecting system 11. The inlet end 101 and the outlet end 102 of the U-shaped glass cuvette 1 are placed in the high refractive index prism sample cell 9. The monochromatic LED light source 12 and the linear array CCD acquisition system 11 are connected with and controlled by the ARM controller.

The ARM controller controls the area array CCD collection system to firstly realize image collection of a tested sample, processes and analyzes the image to obtain defect state evaluation of the tested sample, prompts a user to eliminate interference factors such as bubbles and impurities, continues measurement of the density and the refractive index of an object, and finally controls the touch liquid crystal color screen to realize display of the density and the refractive index of the tested sample.

When the liquid density is measured, a U-shaped tube resonance technology is adopted, firstly, a micro piezoelectric displacer 3 is electrified to generate mechanical force to excite a U-shaped glass cuvette mounting seat 2 to generate vibration, so that a U-shaped glass tube connected with the U-shaped glass cuvette mounting seat is caused to generate cantilever beam motion, and the sinusoidal change of light is caused by partial shielding of the glass tube in a light path; a sine signal is obtained by adopting a photoelectric detection method and is fed back to the miniature exciting coil through a 90-degree phase-shifting circuit, so that the resonance of the U-shaped glass cuvette is realized; and detecting the resonance frequency through a frequency detection circuit to realize the density measurement of the sample.

As shown in fig. 2, the refractive index measurement module works according to the following principle: the liquid to be measured is introduced into the high refractive index prism sample groove 9 through the refraction injection port 901. Monochromatic light emitted by a monochromatic LED light source 12 is imaged on a contact surface of a high-refractive-index prism sample groove 9 and a sample 6 to be detected through a second condensing lens 10, a total reflection phenomenon is generated, and a reflected image finally irradiates a sensitive surface of a linear array CCD (charge coupled device) acquisition system 11 to form a black-and-white image; the ARM controller controls the monochromatic LED light source 12 to emit light and controls the linear array CCD acquisition system 11 to acquire a total reflection image of a measured object, the total reflection image is used for determining a total reflection angle, the refractive index of the measured object corresponding to the wavelength is calculated, and meanwhile, the density value of a sample measured by the density measurement part optical system is controlled. After the measurement is completed, the sample is discharged through the refraction exit 902.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, those skilled in the art will appreciate that; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims (3)

1. A density-refraction integrated instrument comprises a density measuring module (a) and a refractive index measuring module (b), and is characterized in that: the density measurement module (a) comprises a U-shaped glass cuvette (1), an inlet end (101) and an outlet end (102) of the U-shaped glass cuvette (1) are fixedly arranged on a U-shaped glass cuvette mounting seat (2), a piezoelectric shifter (3) is arranged on the U-shaped glass cuvette mounting seat (2), the piezoelectric shifter (3) can excite the U-shaped glass cuvette mounting seat (2) to vibrate, a condensing lens I (5) is arranged on an emergent light path of an LED light source (4), white light emitted by the LED light source (4) is changed into parallel light through the condensing lens I (5) to be emitted and then irradiates a measured sample (6) at the bottom of the U-shaped glass cuvette (1), light after being partially shielded and absorbed by the measured sample (6) is focused on a photosensitive surface of a surface array (8) through an imaging lens (7), and the inlet end (101) and the outlet end (102) of the U-shaped glass cuvette (1) are connected to the refractive index measurement module (b);

the refractive index measuring module (b) comprises a high refractive index prism sample groove (9), a refraction sample inlet (901) and a refraction sample outlet (902) are arranged on the high refractive index prism sample groove (9), a condensing lens II (10) is arranged on an emergent light path of the monochromatic LED light source (12), monochromatic light emitted by the monochromatic LED light source (12) is imaged on contact surfaces of the high refractive index prism sample groove (9) and a measured sample (6) through the condensing lens II (10) to generate a total reflection phenomenon, and a reflected image finally irradiates on a sensitive surface of the CCD linear array collecting system (11).

2. A density-refractometer as claimed in claim 1, wherein: the inlet end (101) and the outlet end (102) of the U-shaped glass cuvette (1) are arranged in the high-refractive-index prism sample groove (9).

3. A density-refractometer as claimed in claim 1, wherein: the monochromatic LED light source (12) and the linear array CCD acquisition system (11) are connected with and controlled by the ARM controller.

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