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Evaluation of Optical Instruments for Real-Time Continuous Monitoring of Smoke Particulates

Evaluation Results and Discussion (continued)

Real-Time Continuous Monitoring Results (continued)

Radiance Research Nephelometer

1998 Laboratory Tests—The Radiance Research nephelometers overestimated the mass-concentration results by 1.90 for sampler No. 1 and 1.81 times for sampler No. 2 (figures 26 and 27). The R² values were 0.97 and 0.92, respectively. For the 12 samples when two Radiance nephelometers were collocated, Radiance No. 2 underestimated the mass-concentration estimate of Radiance No. 1 by 5.5-percent (slope = 0.95, R² = 0.99). Concentration ranges for the tests varied between 20 µg/m³ and 450 µg/m³ as measured by the gravimetric sampler.

Figure 26—The 1998 laboratory results of the two Radiance
Research nephelometers and the gravimetric sampler.
Gravimetric results are from the Fire Science Laboratory
gravimetric sampler.

Figure 27—The 1998 laboratory results of the two Radiance
Research nephelometers compared to one another.

Radiance Research Nephelometer continued

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