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 Technology & Development Center |
Real-Time
Smoke
Particulate Sampling
Fire Storm 2000
The accuracy of each of the real-time instruments was determined by its computed average mass concentration compared to the FRM PM2.5 concentration. The data from the various instrument types and locations are compared in figures 17 to 32 using the least squares linear regression coefficients. Each figure shows the appropriate data points, slope equation with intercept, and the correlation coefficient. Dashed lines indicate a one-to-one relationship. Solid lines show the best-fit regressions.
Figure 17 (Missoula) and Figure 18 (Hamilton) show the nephelometer-based instrument data. All regression statistics for each instrument are summarized in table 4.
Table 4—Regression results for real-time instruments compared to the BGI PQ 200 federal reference method air sampler.
|
Instruments |
(Intercept
included) |
(No
intercept) | ||||
|---|---|---|---|---|---|---|
|
Regression slope |
Intercept (µg/m3) |
Correlation coefficient |
Regression slope |
Intercept |
Correlation coefficient | |
| Nephelometers | ||||||
| DataRam SN 2484/FRM1 |
2.61 |
-32.43 |
0.98 |
2.28 |
0 |
0.96 |
| DataRam SN 2327/FRM |
2.34 |
-45.92 |
0.98 |
2.10 |
0 |
0.96 |
| Radiance Research SN 102/FRM |
1.52 |
-6.88 |
0.94 |
1.45 |
0 |
0.94 |
| Radiance Research SN 101/FRM |
1.43 |
-6.59 |
0.99 |
1.39 |
0 |
0.99 |
| Met One GT-640 SN 5278/FRM |
0.94 |
-6.15 |
0.87 |
0.88 |
0 |
0.87 |
| Met One GT-640 SN 1466/FRM |
1.67 |
-30.26 |
0.99 |
1.52 |
0 |
0.97 |
| Optec NGN-3 Neph/FRM |
1.43 |
-11.04 |
1.00 |
1.36 |
0 |
0.99 |
| Aethalometers | ||||||
| Andersen 370 nm channel/FRM |
0.051 |
0.349 |
0.970 |
0.055 |
0 |
0.959 |
| Andersen 880 nm channel/FRM |
0.027 |
0.111 |
0.980 |
0.029 |
0 |
0.974 |
1 FRM stands for federal reference method gravimetric sampler, the standard against which all instruments were compared.
Figure 17—Test results of all the light-scattering instruments
at Missoula, MT.
Figure 18—Test results of real-time instruments at Hamilton, MT.
| USDA Forest Service, Technology and Development Last Modified: 10/15/2016 23:43:14 |
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