Electromagnetic metrology of millimeter and submillimeter wavelength bands at last years in Ukraine

Abstract

In recent years, works on electromagnetic metrology were continued in Ukraine, including those covered by the present Symposium wave range, Because of the absence of state programs that could initiate the investigation, the organizing part played the Ukrainian URSI Committe and fust of all A, e, and J Commissions and their Chairmen. Unfortunately, because of the known common difficulties in Ukraine, there were no radically new achievements in millimeter and submilluneter waves ranges. But, in my opinion, there are suficiently interesting results that should be mentioned in this report and thet will be presented in greater detail by the authors of the relevant reports. Works should be mentioned of professors A. Kleiman and VSolovyov group (Scientfic and Production Association “Metrologiya”) on the development of hightly stable frequency standards and their metrologic characteristics measurement devices that can operate over inillimeter and submillimeter wave ranges. The theoretical base of such equipment is laid, in its base the main unit lies which assures measurement of frequency instability with the resolution of (1-3) 1044 for measurement time of 1 s on the frequency of 5 MHz and spectral density of power of phase fluctuations with the resolution of -1 75 dB/Hz on the analysis frequency of I kHz and works in the carrier frequencies range of 1 to 100 MHz. to 103 s, and spectral density of power of phase fluctuations is measured in the analysis frequencies band of 10-3 to 106 Hz. The use of realized metrological generators permits to carry out measurement up to frequencies of 300 GHz and higher. The method of direct multiplication of frequency from standard sources has a number of essential limitations which makes impossible its use for standard frequencies transfer into subrmllimetric range and higher as when multiplication ratios are 104 the phase noise increases intolerably. The complicated problem of high-stable generators development for realization of such sources in the metrological systems take a particular place in the problems of submillimetric range systems realization. The creation of sources for metrological systems and also for the united tune, frequency and length standard is realized by the use of venous-type gciierlttors whicli ere slabilizcd by incans of piltlsc lock. Them suggested the method of phase lock multiringed optimal systans coinputation which pcnnits to maximize the stabilized generator output signal SM ration. Frequency instability is measured for any time interval in the range of