RU184760U1 - Mini spectrometer for smartphone - Google Patents

Abstract

The utility model relates to measuring equipment, namely to small-sized spectral devices designed to measure the characteristics of the spectrum, determine the wavelength of the radiation source, and can be used in various fields of the national economy, as well as in gemology, for the operational control of precious stones. The mini-spectrometer is designed to be connected to a smartphone and consists of an opaque case, in which are located: an acrylic fiber, a slit camera with an entrance slit located at an angle of 35 °, a monolithic acrylic body, on the input surface of which a passing plastic diffraction grating is glued, the output surface is cut off at an angle of 45 °, covered with aluminum and magnesium fluoride, serves as an output mirror made with the possibility of projecting the spectrum onto the smartphone’s camera for its registration and processing. The technical result is to reduce the dimensions of the mini-spectrometer and measurement errors of the recorded parameters of the radiation spectrum, as well as increasing the functionality and versatility of the smartphone. 4 ill.

Description

The utility model relates to measuring equipment, namely to small-sized spectral devices designed to measure the characteristics of the spectrum, determine the wavelength of the radiation source, and can be used in various fields of the national economy, as well as in gemology, for the operational control of precious stones.

A known spectral device with longitudinal decomposition of light into a spectrum, (RU 2359239, IPC G01J 3/22, publ. 06/20/09), containing a radiation channel, a flat mirror, a dispersing element, a dispersive disk is used as a dispersing element, on which using the mask retains a narrow annular gap, while the mirror surface of the CD is a spiral path, the step of which is comparable with the wavelength of visible light, a photosensitive sensor with a step drive or a line of photodiodes are introduced.

The main disadvantages of this device are the lack of a processing unit, the inability to directly observe the radiation spectrum, the bulkiness and inconvenience of measurements.

Also known is a device for spectral decomposition of light and measuring wavelengths, taken as a prototype (RU No. 2472117, IPC G01J 3/18, G02F1 / 00 publ. 10.01.2013, Bull. No. 1), consisting of an opaque body and a dispersing element, as which uses a compact disk installed inside the housing, characterized in that for recording the emission spectrum a digital camera located outside the housing is used, to the screen of which a scale for measuring light wavelengths is attached, the camera lens is inserted into the pipe wall attached to the inner wall It has an inner diameter which corresponds to the outer diameter of the lens, through an opening formed in the front wall of the housing; a radiation channel in the form of a slit is located to the left of the hole, and a fragment of a compact disk cut out perpendicular to the direction of the disk tracks with a width of at least the height of the radiation channel and attached to the opposite side of the housing perpendicular to the tube with the lens is used as a dispersing element.

The main disadvantage of this device is the lack of processing unit, the inaccuracy of measuring the wavelength, as well as the bulkiness of the device.

The technical task of the utility model is to create a mini-spectrometer for a smartphone operating in the first order of wavelengths for the purpose of registration, primary processing of the spectrum, determination of wavelengths in the range 400-760 nm, estimation of the quality of the spectrum of the radiation source and its features.

The technical result consists in increasing the functionality and versatility of a smartphone while reducing the size of the mini-spectrometer and the measurement error of the recorded parameters of the radiation spectrum.

This is achieved by the fact that in the proposed device of a mini-spectrometer for a smartphone, consisting of an opaque case, inside which an optically homogeneous monolithic body made of acrylic is placed, on one side of which a plastic diffraction grating is glued, and on the other hand, an output mirror is formed to project the spectrum onto the camera a smartphone. The smartphone’s camera registers the emission spectrum, the smartphone’s processor processes the parameters of the recorded spectrum in accordance with a specially developed program, the result of spectrum processing is displayed on the smartphone’s screen.

An optically homogeneous monolithic acrylic body in a mini-spectrometer is used to eliminate problems associated with alignment, adjustment, vibration, etc. Unused surfaces of the acrylic body are coated with black epoxy adhesive with a refractive index approximately equal to the refractive index of the acrylic body.

Using a smartphone is convenient for the user, as allows you to quickly register the spectrum, visually observe the received image of the radiation spectrum, quickly process the received image. A specially designed program allows you to perform three basic spectroscopic measurements, namely: to measure the absorption, reflection, and emission spectra. The program interface allows you to choose a spectrum processing method, display data in real time, evaluate the operation of the spectrometer and quickly change settings, immediately display the result of the change and save the data.

In FIG. 1 shows a general view of a mini-spectrometer mounted on a smartphone.

In FIG. 2 shows the optical layout of the spectrometer.

In FIG. 3 shows a general view of a mini spectrometer in a housing.

In FIG. Figure 4 shows the screen of a smartphone with the interface of a program for controlling, recording, and processing the radiation spectrum.

A general view of a mini spectrometer mounted on a smartphone is shown in FIG. 1. The mini-spectrometer (Fig. 2) consists of an acrylic fiber 1, an entrance slit 2 located on the slit chamber 3, a plastic diffraction grating 4 glued on the input surface 5 of the monolithic acrylic body 6, the output surface 7 cut at an angle of 45 °, coated with aluminum and magnesium fluoride to protect the aluminum coating from oxidation in air, and which is an output mirror for projecting the spectrum onto the smartphone’s camera.

The device operates as follows (Fig. 3). The radiation of the investigated light source through the acrylic fiber 1 is projected onto the slit 2 (4 × 0.2 mm) located on the slotted chamber 3 at a sliding angle of 35 °. Next, the image of the slit is projected onto a passing plastic diffraction grating 4 (1000 lines / mm) glued onto the input surface 5 of the monolithic acrylic body 6. The image of the gap spread out by the grating into the spectrum, passing through the monolithic acrylic body, enters the flat mirror 7 and, reflected from it projected into the camera lens of a smartphone.

The mini-spectrometer has been implemented and tested experimentally; it allows a high degree of accuracy to study the characteristics of the spectrum of radiation sources.

Claims (1)

A mini-spectrometer made with the possibility of connecting to a smartphone, consisting of an opaque case, in which there are: an acrylic fiber, a slit camera with an entrance slit located at an angle of 35 °, a monolithic acrylic body, on the input surface of which a passing plastic diffraction grating is glued, and the output surface, cut at an angle of 45 °, coated with aluminum and magnesium fluoride, serves as an output mirror and is configured to project the spectrum onto the smartphone’s camera for recording and processing stvom smartphone processor to output video of the finished spectrum on the smartphone screen.

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