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),

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1967-08-24

Pagination or Media Count:

11.0

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

Subject Categories:

  • Aerodynamics
  • Test Facilities, Equipment and Methods
  • Fluid Mechanics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE