N. I. Chubrik

Spectral Complex for Controlling the Parameters of the Plasmachemical‐Reactor Working Medium

An automated spectral complex for controlling the parameters of the plasmachemical‐reactor working medium by the emission and absorption spectra in the 200–1100‐ and 2000–5000‐nm ranges has been developed. To record radiation, a CCD array and a pyroelectric detector are used. Control of the spectral device functions, data recording, and the obtaining of results reflecting the working‐medium parameters and the concentration in it of components being measured are carried out by means of a personal computer. The complex makes it possible to study the temporal behavior of the working‐medium parameters being measured with a resolution of up to 10−2 sec.

MEASURING THE GAS TEMPERATURE IN A GLOW DISCHARGE IN NITROGEN WITH RAPID PUMPING

Bands of the sequence &V = --2, --3, --4 of the second positive system of nitrogen N~(2+) were used in the capacity of the pyrometric component when studying glow discharge in sealed or weakly permeable tubes [6, 7]. The present work examines the usefulness of MURS for operational monitoring of the gas temperature in a glow discharge in an atmosphere of nitrogen with a pumping rate v through an interelectrode gap of ~i00 m/sec at an operating pressure of p > 1.33 kPa. The need for similar studies is caused by lasers being used in technology which have separate excitation of the gain mediums components [8] along with closed cycle CO2-EDLs. The merit of identifying the rotational temperature Tro t with the gas temperature Tg follows from the relationship between the rotational relaxation time TR-T [9-11] and the lifetime ~c of the C3Eu of nitrogen allowing for its deactivation due to collisions with other molecules [12]. For p = 1.33 kPa in correspondence with the data of [9-12], Tc/TR_T - i0, i.e., in the course of rc = 40 nsec rotational--translational relaxation does not take place and a Boltzmann distribution of the molecules is established in the CSHu state with respect to the rotational levels with a temperature Tro t = Tg. The validity of the proposition just made is demonstrated experimentally in [13].