SU826229A1 - Device for determining flat and protein content in milk and dairy products - Google Patents

Description

The invention relates to the dairy industry, in particular to devices for simultaneously determining the content of fat and protein in milk and dairy product.

A device for determining the content of fat and protein in milk and dairy products containing a light source, a lens, a diaphragm, a light filter, a cuvette, photodetectors, respectively, of direct and diffused light fluxes, a power supply and measurement units £ 1].

However, the known device does not provide for the complete separation of the scattered light flux, is not eliminated _{(5, the} mutual influence of the light flux, which does not allow the study to be carried out with sufficient accuracy.

The purpose of the invention is to increase the accuracy of measurement.

This goal is achieved in that the device for determining the content of fat and protein in milk and dairy products, containing a light source, a lens, a diaphragm, a light filter, a cuvette, photodetectors respectively of direct and diffused light fluxes, a power supply and measurement units, is equipped with a collecting lens the diffused light flux located behind the cell, which is concave and placed convexly to the light source, while the photodetector of the directly transmitted light flux is mounted on a collecting lens from the light source at the focus of the cuvette, and a photodetector scattered light flux collecting lens is located behind the diffused light flux in the focal plane of the lens perpendicular to the optical axis of the light source.

In addition, the scattered-flux collecting lens is aligned with the optical axis of the light source.

In the drawing. shows a block diagram of the proposed device.

A device for determining the content of fat and protein in milk and dairy products contains a light source 1 located in the focal plane of the collecting lens 2, which gives a plane-parallel light flux, the magnitude of which can be adjusted using the diaphragm 3 located along the optical axis behind the lens 2. The required wavelength of the light flux is allocated by the filter 4, installed after the diaphragm 3. ¹⁰

The device contains a concave cuvette with a controlled sample of milk concentrating the direct transmitted light flux onto the photodetector 6 of the direct transmitted light flux located on the ¹⁵ collecting lens 7 of the diffused light flux from the side of the light source 1 at the focus of the optical cell 5. The photodetector is used to convert the direct transmitted light flux into an electric ²⁰ signal and to prevent the penetration of this light flux into the collecting lens 7 of the diffused light flux, on which the diffused light flow. The collecting lens ²⁵ 7 usta- Credited cuvette for 5 coaxially with the optical axis of the light source. The photodetector of the diffused light flux is installed —foam behind the collecting lens 7 in its focal plane. A photodetector, 8 serves ³⁰ to convert the diffused light flux into an electrical signal. The signals from the photodetectors 6 and 8 are received in the measurement unit, the measurement result is issued by the display unit 10. Power fected ³⁵ carried by block 11 power.

The device operates as follows.

Test sample of milk is poured into a cell 5. The rays of the light source 1, proy- ⁴⁰ AH collecting lens 2, a diaphragm 3, filter 4 that distinguishes certain. the wavelength of the spectrum, fall on a cell 5 with milk, where they are partially scattered in proportion to the amount of fat and protein in the milk,

The direct-transmitted light flux, attenuated by scattering of particles of fat and protein, is perceived by the photodetector 6. The light flux scattered ^{so by the} particles of fat and protein is focused with a pick-up lens 7 on the photosensitive surface of the photodetector 8, Signals from photodetectors 6 and 8, depending on the content of fat and protein in the sample are supplied to the measuring unit 9. The signal from the photodetector 6, proportional to the intensity of direct light, decreases with increasing content of fat and protein in the sample, and the signal from the photodetector 8, in proportion The natural intensity of the scattered light increases.

As blocks, you can use analog devices and elements of digital computing.

The invention allows with high accuracy to determine the content of components in various samples without additional corrections.

Claims (2)

The invention relates to the dairy industry, in particular to devices for simultaneously determining the content of fat and protein in milk and dairy products. A device for determining the content of fat and protein in milk and dairy products is known, which contains a light source, a lens, a diaphragm, a light filter, a cuvette, photodetectors, respectively, past and scattered light fluxes, a block of light, and HZ measurement units. However, the known device does not provide complete the scattering of the light flux is not eliminated, the mutual influence of the light flux is not eliminated, which does not allow conducting the study with sufficient accuracy. The purpose of the invention is to improve the measurement accuracy. The goal is achieved by the fact that a device for determining the content of fat and protein in milk and dairy products, containing a light source, lens, diaphragm, light filter, cuvette, photodetectors, respectively, of the transmitted and diffused light fluxes, power supply unit and measuring units, is equipped with a collecting lens the scattered light flux located behind the cuvette, which is made concave and placed convex part to the light source, while the photodetector of the directly transmitted light flux is mounted on the collecting lens on the side of the light source at the focus of the cuvette, and the photodetector is the scattered light flux located behind the collecting lens of the scattered light flux in the lens focal plane perpendicular to the optical axis of the light source. In addition, the collecting lens of the scattered flux is located coaxially with the optical axis of the light source. In the drawing. shows a block diagram of the proposed device. A device for determining the content of fat and protein in milk and dairy products contains a source of light 1 located in the focal plane of the collecting pinza 2, giving a paraffin luminous flux, the value of which can be controlled using an aperture 3 located along the optical axis behind the lens 2. The required wavelength of the light flux is separated by the light filter 4, installed after the diaphragm 3. The device contains a concave cuvette 5c with a controlled breakdown of milk concentrating the transmitted light flux on the photocell. the receiver 6 is a direct passing light beam located on the collecting lens 7 of the diffused light outflow from the source 1 of the light in the focal point of the optical cell 5. The photoreceiver 6 serves to convert the forward light into an electrical signal and prevent this light from penetrating into collecting lens 7 scattered light flux. on which the scattered light flux is concentrated. A lens 7 is mounted behind the cuvette 5 coaxially with the optical axis of the light source. A photoreceiver of 8 scattered light flux is installed behind the collecting lens 7 in its focal plane. The photodetector 8 serves to convert the scattered light flux into an electrical signal. The signals from the photodetectors 6 and 8 are fed to the measuring unit 9, the measurement result is output by the display unit 10. Power is supplied from power supply unit 11. The device works as follows. The test sample of milk is drunk in the cuvette 5. The rays of the light source 1, after passing the collecting lens 2, the diaphragm 3, the light filter 4, which allocates a certain wavelength of the spectrum, fall on the milk cuvette 5, where it is partially scattered in proportion to the amount of fat and protein in the milk, Pr Glowed luminous flux, attenuated due to scattering on fat and protein particles, is perceived by photojet XjiKom 6. Light flux scattered by particles of fat and protein is focused with biracic lens 7 on the photosensitive surface of photodetector 8. Signals from 6 and 8, depending on the content of fat and protein in the sample, enter measurement block 9. The signal from the photodetector 6, proportional to the intensity of the MOSH grove of the dimmer light, decreases with increasing fat and protein in the sample, and the signal from the photodetector 8 proportional to the intensity of the scattered light increases. As blocks, you can use analog devices and elements of digital computing. The invention makes it possible to accurately determine the content of components in different samples without additional corrections. Claim 1. Device for determining the content of fat and protein in milk and dairy products, containing a light source, lens, diaphragm, light filter, cuvette, photodetectors, respectively, of transmitted and diffused light fluxes, power supply and measuring units, about l due to the fact that, in order to improve the accuracy of measurement, it is equipped with a collecting pincer of a scattered light flux located behind the cuvette, which is made concave and placed with a convex part to the light source, while the photodetector is straightforward of the luminous flux fixed on sobirakhtsey lens from the light source at the focus of the cuvette, and a photodetector scattered light flux collecting lens is located behind the scattered light flux in the focal plane of the lens perpendicular to the optical axis of the light source. 2. The device according to claim 1, wherein the collecting lens of the scattered flow is located coaxially with the optical axis of the light source. Sources of information taken into account during the examination 1. USSR author's certificate No. 606132, cl. q O1 N 33 / O6, 1978.