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5 Laser Specklometer, Speckle-Optical Diagnostics and Laser …
Fig. 5.36 Dependence of
power of registered
electromyograms S EMG on
the applied load. Reprinted
from [87] with permission
Fig. 5.37 Dependence of
average frequency f of
intensity fluctuation spectra
of the speckle-field on load
value applied to biceps
muscle of arm. Reprinted
from [87] with permission
has already been mentioned, it is obvious that while using the informative parameters
connected with amplitude characteristics of the signal, the value of the signal should
be carefully controlled to provide reproducibility of results, for example, to introduce
normalization. To do this, a method was offered and a device for normalization of the
intensity of the signal received from the sensor was developed, which can be used
for the following intensity changes of the scattered radiation as a result of changes
of the reflection power of skin, geometry of the sensor-surface system, power of
laser radiation, etc., during investigation of biomechanical characteristics of human
skeletal muscles.