3.5 Results and Conclusions
291
voltage is regulated within the limits of 3–10 kV, and the duration of discharge is
within the limits of 0.1–10 s.
In the exposure mode, the pulse duration of the shutter control can be regulated
within the limits of 0.1–10 s.
For the soft RC, the “frame transfer” mode provides the RC tape advancement
with the regulated frame length within the limits of 5–40 mm, and continuous broach.
Recording modes of holographic interferograms on low- and high-resistance types
of reversible photothermoplastic carriers (PTPC) were perfected. For low-resistance
PTPC, a recording method is used, during which operation of charge, exposure and
development of a hologram is realized simultaneously. Before registration of the
second hologram, the first one is partially erased and then reconstructed simultaneously while developing the second hologram. Charging was conducted by the voltage
on the corona filament within the limits of 4–5 kV, and development—of 65–70°,
the exposure was continuous.
For high-resistance PTPC, the separate holographic method was used, during
which the mentioned operations can be separately realized. Charging is conducted
under the voltage on the corona filament mentioned above, the temperature of thermostating is 40 °C, the power of the developing pulse is 2–3 J/cm
2 , and the exposure
is within the limits of 0.01–0.2 s.
Technical tests were conducted concerning the test sample of LGK on soft and
hard reversible carriers with different values of surface resistance of the working
Table (0.1–0.2 kohm). It was established that recording and erasing of holograms is
conducted on both types of carriers. But reliability and longevity of the conductive
layer of the thermoelement in both cases and for the available samples were on the
level, which does not exclude a failure. That means that under the order development
of 1–2 J/cm
2 , which have to be supplied to the carrier for 5–15 ms, the conductive
layer of the thermoelement can be destructed. The possibility of this fact is greater
if the hard reversible carrier is used. The main reason for destruction is high speed
of temperature increase in the conductive layer, which reaches the value of 2–510
°C/s. This reason is partially eliminated through smoothing of the duration of the
rise-up portion of the developing pulse up to 1–2 ms. But as far as we are concerned,
the decisive factors for enhancing reliability and longevity of the thermoelement
are technology and the structure of the evaporation layer, on which the strength of
adhesion and the layer itself depend.
Recording modes of holographic interferograms of human chest on reversible
carriers (RC) were studied using the test sample of the LHC. The main factor that
characterizes the specific character of recording of the above-mentioned interferograms consists in uncertainty of launching moment of the ruby laser, i.e., by the
choice of the exposure relative to charging operation of RC and its development.
This uncertainty is determined by the necessity of synchronization of the LGC work
with the rate of heart contractions and can reach several seconds depending on the
synchronization algorithm. During this time, dark decrease of the potential level
occurs on the surface of the thermostatic layer; that is why the contrast of a latent
electrostatic image formed during exposure and consequently the contrast of the
interferogram decay.
291
voltage is regulated within the limits of 3–10 kV, and the duration of discharge is
within the limits of 0.1–10 s.
In the exposure mode, the pulse duration of the shutter control can be regulated
within the limits of 0.1–10 s.
For the soft RC, the “frame transfer” mode provides the RC tape advancement
with the regulated frame length within the limits of 5–40 mm, and continuous broach.
Recording modes of holographic interferograms on low- and high-resistance types
of reversible photothermoplastic carriers (PTPC) were perfected. For low-resistance
PTPC, a recording method is used, during which operation of charge, exposure and
development of a hologram is realized simultaneously. Before registration of the
second hologram, the first one is partially erased and then reconstructed simultaneously while developing the second hologram. Charging was conducted by the voltage
on the corona filament within the limits of 4–5 kV, and development—of 65–70°,
the exposure was continuous.
For high-resistance PTPC, the separate holographic method was used, during
which the mentioned operations can be separately realized. Charging is conducted
under the voltage on the corona filament mentioned above, the temperature of thermostating is 40 °C, the power of the developing pulse is 2–3 J/cm
2 , and the exposure
is within the limits of 0.01–0.2 s.
Technical tests were conducted concerning the test sample of LGK on soft and
hard reversible carriers with different values of surface resistance of the working
Table (0.1–0.2 kohm). It was established that recording and erasing of holograms is
conducted on both types of carriers. But reliability and longevity of the conductive
layer of the thermoelement in both cases and for the available samples were on the
level, which does not exclude a failure. That means that under the order development
of 1–2 J/cm
2 , which have to be supplied to the carrier for 5–15 ms, the conductive
layer of the thermoelement can be destructed. The possibility of this fact is greater
if the hard reversible carrier is used. The main reason for destruction is high speed
of temperature increase in the conductive layer, which reaches the value of 2–510
°C/s. This reason is partially eliminated through smoothing of the duration of the
rise-up portion of the developing pulse up to 1–2 ms. But as far as we are concerned,
the decisive factors for enhancing reliability and longevity of the thermoelement
are technology and the structure of the evaporation layer, on which the strength of
adhesion and the layer itself depend.
Recording modes of holographic interferograms of human chest on reversible
carriers (RC) were studied using the test sample of the LHC. The main factor that
characterizes the specific character of recording of the above-mentioned interferograms consists in uncertainty of launching moment of the ruby laser, i.e., by the
choice of the exposure relative to charging operation of RC and its development.
This uncertainty is determined by the necessity of synchronization of the LGC work
with the rate of heart contractions and can reach several seconds depending on the
synchronization algorithm. During this time, dark decrease of the potential level
occurs on the surface of the thermostatic layer; that is why the contrast of a latent
electrostatic image formed during exposure and consequently the contrast of the
interferogram decay.