Abstract

The spectral energy of a light transmitted through the cheek was tested photographically in the region of λ0.86μ, and also by a spectrometer throughout the whole spectrum. A very sensitive vacuum thermocouple was used. The photographs of the spectrum showed 14% transmission of λ0.86μ through the cheek. The cheek transmitted a maximum of 20% at λ1.15μ and the water in the body cut off the longer wave lengths. The spectral energy transmitted by bacon fat was found to be similar to that of the cheek; however, it transmitted nearly five times as much energy. The ordinary incandescent electric light with filters to cut out the visible and infrared beyond λ1.4μ is ideal for deep penetration of light into the body.

© 1930 Optical Society of America

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References

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  1. Archives of Physical Therapy, X-ray & Radium, 10, No. 3.
  2. Edison Pettit, Astrophysical Journal,  66, 1927.
    [Crossref]
  3. Sonne, Archives of Physical Therapy, X-ray & Radium, March1929.
  4. Henry Laurens, Physiological Reviews,  8, No. 1, 1928.

1929 (1)

Sonne, Archives of Physical Therapy, X-ray & Radium, March1929.

1928 (1)

Henry Laurens, Physiological Reviews,  8, No. 1, 1928.

1927 (1)

Edison Pettit, Astrophysical Journal,  66, 1927.
[Crossref]

Laurens, Henry

Henry Laurens, Physiological Reviews,  8, No. 1, 1928.

Pettit, Edison

Edison Pettit, Astrophysical Journal,  66, 1927.
[Crossref]

Sonne,

Sonne, Archives of Physical Therapy, X-ray & Radium, March1929.

Astrophysical Journal (1)

Edison Pettit, Astrophysical Journal,  66, 1927.
[Crossref]

Physiological Reviews (1)

Henry Laurens, Physiological Reviews,  8, No. 1, 1928.

X-ray & Radium (1)

Sonne, Archives of Physical Therapy, X-ray & Radium, March1929.

Other (1)

Archives of Physical Therapy, X-ray & Radium, 10, No. 3.

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Figures (3)

Fig. 1
Fig. 1

Transmission of light through the cheek and bacon fat 5 mm thick for λ.86μ.

Fig. 2
Fig. 2

Intensity distribution of source and light transmitted through the cheek and bacon fat each 5 mm thick.

Fig. 3
Fig. 3

Percentage transmission of infra-red through the cheek and through bacon fat each 5 mm thick.