SU147001A1 - The way to install the output slit on the spectral line - Google Patents

Description

Known methods of installing the output slit on the spectral line are complex. They do not provide high accuracy of installation of a given spectral line in the center of the slit and are unsuitable for slots of various widths.

The proposed method is free from these disadvantages

This is achieved due to the fact that simultaneously with the signal from the photomultiplier of the spectrometer, giving the spectrum curve on the oscilloscope screen, the modulating electrodes of the oscilloscope cathode tube give a negative polarity signal from the auxiliary photomultiplier forming a gap on the spectrum curve the output slit along the spectrum until the vertex of the image of the line under study on the oscilloscope screen coincides with the reference mark.

The drawing shows a cricket diagram of installation of the output slit on the spectral line, according to the described method.

Behind the entrance slit 1 of the spectrometer is placed a plane-parallel glass, plate 2, rotated by a synchronous motor around an axis parallel to the slit 7. The lower part of plate 2 is covered with a mirror layer. The light from the source 3 under study passes through the transparent part of the plate and, due to its rotation, is deflected in such a way that a small part of the spectrum periodically passes in front of the output slit 4 of the spectrometer. The electrical signal arising from the photoelectric receiver 5, located behind the output slit, is fed to an oscilloscope vertical deflection amplifier, the horizontal scan of which is synchronized with the network, resulting in an image of the spectrum under consideration on the oscilloscope screen. At the same time, the light from the additional incandescent lamp 7 is directed to the entrance slit / condenser 6.

No. 147001 2 which hits the mirror surface of a plane-parallel plate 2. At that moment, when plate 2 is in a position perpendicular to the incident beam, the light reflected from it is directed back to pcel / and condenser 8 is projected onto an auxiliary photomultiplier 9. The amplified signal from This photomultiplier is fed in negative polarity to the modulating electrodes of an oscilloscope electro-ray tube and locks it. On the spectrum curve drawn on the oscilloscope screen, a break of the reference level occurs. 10. Fiducial mark indicates a point of the spectrum, which will be in the center of the output slit plate 2 if the output of the light beam.

The process of setting the output slit on the spectral line consists in moving the output slit along the spectrum until the top of the image of the line of interest on the oscilloscope screen coincides with the reference mark. After that, the plane-parallel plastic 2 is removed from the light beam and the spectrometer is in a state of readiness to perform the necessary measurements.

In the case when the removal of plate 2 causes defocusing, then a compensating plane-parallel plate is introduced perpendicular to the light beam. The accuracy of combining the reference mark with the centro.m of the line image on the oscilloscope screen depends on

the ratios /, is the time during which the light from the spectral line passes through the exit slit, a /; - the duration of the reference signal. To keep the otnogen-y-constant for any

openings of the entrance slit in the system introduced an additional slit //, which limits the angular dimensions of the light beam incident on the mirror coating of the plate. The knives of the entrance and additional gaps are fastened in pairs in such a way that both gaps are always equal in width.

Subject invention

The way to install the output slit on the spectral line that differs (that, in order to increase the accuracy and simplify the process of fitting a given spectral line along the center of the slit, simultaneously with the signal from the photomultiplier of the spectrometer, which gives the spectral curve on the screen; oscilloscope beam tube gives a signal of negative polarity From the auxiliary photomultiplier, which forms a gap in the spectrum curve (reference point), and moves the output slit along the spectrum until The tire of the image of the line under investigation on the oscilloscope screen does not coincide with the reference mark.