Technical Perspective:

• The optical device comprises 16 apertures for detection and 2 apertures for laser to pass through the aerosol medium & then to light trap.
• There is a component of IRIS for receiving the beam going towards the measurement section with an aperture of diameter 0.5 mm to reduce intensity variations.
• Further condensing lens (f = 12 mm) for collecting the scattered signal that passes through the polarizer and coupled to a photo multiplier tube (PMT) using the optical fiber.
• The optical fiber coupling the scattered signal to the PMT was connected to a Wave Runner 6100A oscilloscope for sampling the scattered signal from the particles at 1 MHz per channel & the amplitude was averaged over the duration of pulse (1s) to reduce the effect of random noise. (Refer Fig. 2)
• The measurements were conducted for 1 MHz, 10 MHz & 25 MHz sampling rates & an acceptable signal to noise ratio (SNR) obtained above 1 MHz sampling rate. (Refer Fig. 3)
• The photo multiplier tube (PMT) output was averaged over the entire signal pulse above the threshold where the threshold defined as µ + 3σ of the reference signal recorded with the flow without the water aerosol.

Industrial Perspective:

• Cost-effective & echo-friendly device & applicable for low dust loading applications.