Accession Number : AD0669271

Title :   CHARACTERISTICS OF THE DYNAMIC CALIBRATION OF AN INSTRUMENT FOR MEASURING THE INSTANTANEOUS TEMPERATURES OF GAS FLOWS (OSOBENNOSTI DINAMICHESKOI TARIROVKI APPARATURY DLYA IZMERENIYA MGNOVENNYKH TEMPERATUR GAZOVYKH POTOKOV),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Simbirskii,D. F.

Report Date : 24 AUG 1967

Pagination or Media Count : 11

Abstract : There are several methods of overcoming the thermal inertia of thermocouples and resistance thermometers in measuring the rapidly changing temperatures of gas flows. The report describes a measuring d-c amplifier built on semiconductor triodes. This instrument makes it possible to make automatic corrections of the signal which is always distorted due to the inertia of the sensor. A line diagram of the amplifier-corrector is given. The correcting four-pole component, the time constant of which V sub K = RC, is in the first stage of the amplifier-corrector. The next two stages make it possible to record the corrected signal on a loop oscillograph. The condition for the execution of the correction is the relation V sub K = V sub D, where V sub D is the time constant of the sensor. It is concluded that the employment of the correcting device makes possible the elimination of the thermal inertia effect of the sensor within a broad range of temperature variations. A quantitative evaluation of the effectivity of the employment of the device may be performed either on a calibrated device with P-shaped temperature pulses, or by analysis of the frequency characteristics of the measuring channel. (Author)

Descriptors :   (*TEMPERATURE SENSITIVE ELEMENTS, CALIBRATION), (*GAS FLOW, TEMPERATURE), DETECTORS, INERTIA, AMPLIFIERS, CORRECTIONS, FREQUENCY, USSR

Subject Categories : Aerodynamics
      Test Facilities, Equipment and Methods
      Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE