Analyzer 

PURPOSE:

For online measurement of the mix of air and water droplets, over-cooled to the temperature of -20ºC, moving with a speed of 40m/s.
Intended for direct laboratory measurements in front of the turbine engine exhaust, as well as in field and during flights.
 

MEASURING PURPOSE:

The measurement method of the IPS analyser is complex and rely on reflecting the influence of laser diffraction on measurement for the smallest particles in order to go on, for larger particles, in a continuous and gradual manner, to measure changes in the radiation stream scattered by moving particles. In this way, certain disadvantages of the “laser diffraction” used in the entire measuring range in which individual, largest particles yield weak changes in the diffraction pattern have been eliminated.

There are no optical limitations for measuring individual, small and large particles in the IPS analysers.The radiation stream in infrared not only identifies size of particles, but also renders counting them precisely in the entire measuring range possible.An electric impulse corresponds to each participle. The impulse is proportional to the particle sizeThe set of particles is initially measured with the division into 4096 channels and converted (calibrated) into 256 size classes, which are available to a user.

MEASURING PROCEDURE:

IPS SAM consists of a measuring probe [7] connected with an air-compressor [3] by means of rigid replaceable pipe [2], around which additional electrical wires are conducted, completed with a connectors [4 and 5].A wire 20m in length connects the measuring probe with a measuring and controlling electronic system. The system is controlled from a notebook computer by means of a 1,8 meter USB cable. The measuring system and the computer are powered from 230 VAC power source. The option exists for powering from the source of 27 VDC.There is a particle sensor [1] placed in the measuring probe as well as a flow rate measuring system. Prandtl tube [10] is use for speed measuring. Sensor for measurement of the temperature [9] and humidity of air flowing through the probe is integrated with the flow-meter [13] and particles sensor[1]. The probe is moreover provided with a diffuser [11], a filter  and electronic preamplifiers [7].The air flowing through the filter protects the particle sensor optics against getting dirty.The measuring and controlling electronic system [7] ensures isokinetic intake of the ambient air into the analyzer by means of measuring the speed in the Prandtl tube [10] and regulating the flow rate in the air compressor [3].In case, when the particle concentration in air is too high, the system automatically begins to signalize excessive level of the particle concentration in the measuring space. Then the different (lesser) intake nozzle should be chosen. The flow rate is measured every 0.1 s with the accuracy of 0.4%. The influence of temperature is taken into account when flow rate values are calculated. Variations in the flow rate do not affect accuracy in measuring the volume intake.For speeds exceeding 20m/s the Venturi tube [8] can be used as a sucking component instead of the air compressor [3]. A valve [6] serves for switching between the air compressor [3] and the Venturi tube [8].

CHARACTERISTIC:

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