THE PRESENCE OF SOLID PARTICULATES ENTRAINED IN THE AIR CAN BE DETECTED BY MEASURING THEIR SCATTERED LIGHT AND THE OV OVERALL LIGHT EXTINCTION.

THE PRESENCE OF SOLID PARTICULATES ENTRAINED IN THE AIR CAN BE DETECTED BY MEASURING THEIR SCATTERED LIGHT AND THE OV OVERALL LIGHT EXTINCTION. VERY SENSITIVE EXTINCTION M MEASUREMENTS CAN BE PERFORMED WITH TRANSMISSOMETRY. AM AMONGTHE MOST PROMISING AND SIMPLE TRANSMISSOMETERS ARE THE MA MAXIMUM TURBIDITY METHOD, DISPERSION QUOTIENT METHOD, AND THE TWO-COLOR TRANSMISSOMETER. FOR REASONABLY CLEAN AIR WITH SLIGHT DUST CONTAMINATION MORE SENSITIVITY CAN BE OBT OBTAINED BY LOOKING AT THE CHARACTERISTICS OF THE SCATTERED LIGHT. A MORE ELABORATE TECHNIQUE BASED ON A PULSE HEIGHT ANALYZER COMBINED WITH LASER DOPPLER VELCOMETRY WILL PROVIDETHE SIZE AND VELOCITY DISTRIBUTION OF THE PARTICULATES EN ENTRAINED IN THE AIR. IT IS THE OBJECTIVE OF THIS WORK TO EVALUATE THE ABOVE METHODS TO ESTABLISH THEIR SENSITIVITY TOSIZE AND CONCENTRATION, THEIR INSENSITIVITY TO VARIATIONS ININDEX OF REFRACTION, THEIR INSENSITIVITY TO THE SHAPE OF THETHE PARTICULATES, AND THEIR POTENTIAL WITH SIMPLE WHITE LI LIGHT SOURCES. A METHOD FOR PROTOTYPE IMPLEMENTATION WILL BEESTABLISHED.