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),
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 24, 1967
- Accession Number
- AD0669271
Entities
People
- D. F. Simbirskii
Organizations
- National Air and Space Intelligence Center