Abstract

Measurements of transmittance through dust and debris clouds generated by explosions and moving vehicles from five field tests involving 120 trials were analyzed to determine the degree to which transmittance is wavelength dependent. Statistical tests to determine whether the amounts of time transmittance were reduced to specified levels that were significantly different for various wavelengths revealed, in general, no consistent wavelength dependence. Relationships between the extinction coefficient for IR spectral and visible regions have been established for specific explosive types and soil conditions involved in some of these tests.

© 1981 Optical Society of America

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References

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  1. E. M. Patterson, Appl. Opt. 16, 2414 (1977).
    [CrossRef] [PubMed]
  2. U.S. Army Dugway Proving Ground Report DPG-FR-78-313, Dugway, Utah (1978).
  3. U.S. Army Dugway Proving Ground Report DPG-FR-77-317, Dugway, Utah (1977).
  4. U.S. Army Dugway Proving Ground Report DPG-FR-78-317, Dugway, Utah (1979).
  5. J. D. Lindberg, Atmospheric Sciences Laboratory Report ASL-TR-0021, White Sands Missile Range, N.M. (1979).
  6. Naval Research Laboratory; private communication (1979).
  7. B. W. Kennedy, Atmospheric Sciences Laboratory Report ASL TR-0058, White Sands Missile Range, N.M. (1980).

1977 (1)

Kennedy, B. W.

B. W. Kennedy, Atmospheric Sciences Laboratory Report ASL TR-0058, White Sands Missile Range, N.M. (1980).

Lindberg, J. D.

J. D. Lindberg, Atmospheric Sciences Laboratory Report ASL-TR-0021, White Sands Missile Range, N.M. (1979).

Patterson, E. M.

Appl. Opt. (1)

Other (6)

U.S. Army Dugway Proving Ground Report DPG-FR-78-313, Dugway, Utah (1978).

U.S. Army Dugway Proving Ground Report DPG-FR-77-317, Dugway, Utah (1977).

U.S. Army Dugway Proving Ground Report DPG-FR-78-317, Dugway, Utah (1979).

J. D. Lindberg, Atmospheric Sciences Laboratory Report ASL-TR-0021, White Sands Missile Range, N.M. (1979).

Naval Research Laboratory; private communication (1979).

B. W. Kennedy, Atmospheric Sciences Laboratory Report ASL TR-0058, White Sands Missile Range, N.M. (1980).

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Figures (9)

Fig. 1
Fig. 1

Percent of time measured transmittance was less than specified level K, Fort Sill Dust/Debris Trial P3. Dust source was a moving vehicle. Statistical tests showed that transmittances at 9.75 and 3.443 μm were significantly different from the visible.

Fig. 2
Fig. 2

Percent of time measured transmittance was less than specified Level K, Smoke Week 1 Add-on Trial D1. Dust source was a 1.6-kg TNT charge. Statistical tests showed that transmittances at 9.75, 3.443, and 1.06 μm are significantly different from the visible.

Fig. 3
Fig. 3

Percent of time measured transmittance was less than specified Level K, Smoke Week 2 Trial 26. Dust source was six 6.8-kg charges of C4. Statistical tests showed no significant differences between the various wavelengths.

Fig. 4
Fig. 4

Percent of time measured transmittance was less than specified Level K, Dirt-1 Trial E-2. Dust source was three 155-mm static charges. Statistical tests showed that transmittance at 10.35 μm was significantly different from that at 0.55 μm.

Fig. 5
Fig. 5

Percent of time measured transmittance was less than specified Level K, Dirt-2 Trial A13 (artillery). Dust source was a 155-mm projectile. Statistical tests showed that transmittance at 10.35 μm was significantly different from that at both 1.06 and 0.55 μm.

Fig. 6
Fig. 6

Percent of time measured transmittance was less than specified Level K, Dirt-2 Trial A9 (artillery). Dust source was a 155-mm projectile. No significant differences were detected by statistical tests.

Fig. 7
Fig. 7

Measured and predicted transmittance, Dirt-2 Trial A6 (artillery).

Fig. 8
Fig. 8

Number of occurrences of differences between predicted and measured transmittances at 1.06 μm; 155- and 105-mm rounds (31 rounds total) from Dirt-2.

Fig. 9
Fig. 9

Number of occurrences of differences between predicted and measured transmittances at 10.35 μm; 155- and 105-mm rounds (32 rounds total) from Dirt-2.

Tables (1)

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Table I Characteristics of the Soil for Various Tests

Equations (1)

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Z = X ̅ 1 X ̅ 2 S 1 2 n + S 2 2 n ,

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