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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 (continued)

Field Tests—Results from the field tests (figures 28 and 29) show both the Radiance Research nephelometers overestimated the mass concentration results of the FRM samples. Radiance No. 1 overestimated the concentrations by 27 percent (slope = 1.27, R² = 0.78, N = 22). Radiance No. 2 overestimated the concentrations by 57 percent (slope = 1.57, R² = 0.90, N = 14). Radiance No. 2 was not used for all the field tests. For this reason, different slopes were obtained for the two nephelometers. Comparing the results when both of the Radiance nephelometers were available shows that they estimate essentially the same mass concentration for the field tests (slope = 1.00, R² = 0.97, N = 14).

Figure 28—The 1998 and 1999 field results of the two Radiance
Research nephelometers and the gravimetric samplers.
Gravimetric results are from both the Fire Sciences Laboratory
and Federal Reference Method samplers.

Figure 29—Comparison of the two Radiance Research
nephelometers used in the field tests.

Radiance Research Nephelometer continued

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