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Experiments on meso-optical fourier transform microscope with double focusing
Radiation Measurements, Vol. 25, Nos 1-4, pp. 753-756, 1995 Copyright O 1995 Elsevier Science Ltd Printed in Great Britain. All fights reserved 1350-4487/95 $9.50 + .00
Pergmon
1350-4487(95)00242-1
EXPERIMENTS ON MESO-OPTICAL FOURIER TRANSFORM MICROSCOPE WITH DOUBLE FOCUSING
Yu. A. BATUSOV, L. M. SOROKO and V. V. TERESHCHENKO Joint Institute for Nuclear Research, Dubna, 141980, Moscow Region, Russia
ABSTRACT There are described two experiments on meso-optical Fourier transform microscope with double focusing, one with nuclear emulsion, exposed by the accelerated Ne-nucleus, and another, in which the primary particles were the accelerated Oxigen-nucleus. It is shown that the measurement error of the orientation angle 0~u is equal to -t-1.5 angular minutes. Three kinds of the geometrical distortions in the nuclear emulsion have been detected. KEYWORDS Particle track; nuclear emulsion; microscope; meso-optics; double focusing; geometrical distortions; accelerated Ne- and Oxigen-nuclei. FIRST EXPERIMENT The meso-optical Fourier transform microscope (MFTM) with double focusing for particle tracks of low ionization level in the nuclear emulsion has been described in [1]. The new prototype of the MFTM with double focusing is provided with one spherical frontal immersion lens and has two stereoscopic arms inclined at the angles +30 ° with the main optical axis (Fig. 1), where 1 - spherical frontal immersion lens, 2 - cylindrical objectives, 3 - plane mirrors, 4 - double mirror, 5 - plain mirror, 6 - photosensitive matrix of the CCD, L and R the left and the right meso-optical images, d - the width of the field of view, D - the length of the field of view, and h - the depth of the nuclear emulsion. The scattering event of the particle, shown in Fig. 2, manifests itself in the MFTM as a local jump of the orientation angle 0xy presented versus longitudinal coordinate x (Fig. 3). The observer sees this event as appearance of two pairs of the meso-optical images (Fig. 4), for the particle track A and for the particle track B. The orientation angle 0~y (D~ in pixels) and the dip angle Oz (D u in pixels) of the straight line track of the Oxygen nucleus are presented in Fig. 5 over the length of 10 mm. These data were estimated by the MFTM without any measurements of the spatial coordinates of the differential parts of the whole particle track. The typical standard error of our measurements is of the order of -t-1.5 angular minute for the orientation angle 0~y. We see also in Fig. 5 weak monotonic variation of the dip angle 0z (Dy). This effect is a common one for all particle tracks in this region of the nuclear emulsion, as we can deduce from Fig. 6, where the values of Dy are given for five different particle tracks. The mean value of the observed monotonic variations is equal to 0.65 pixel/mm. This effect can be explained by the forced bending of the glass support of the nuclear emulsion layer in the course of the drying during the photochemical treatment. 753
754
Yu. A. BATUSOV et al.
SECOND EXPERIMENT Another kind of the geometrical distortions of the nuclear emulsion layer, detected by the traditional optical microscope with precise mechanical stage, was observed near the edge of the nuclear emulsion. Only the difference plots (y2- y3) and (z2-z3) for c~2-and a3-particles, which are mutual very close over the length of ~ 25 mm, demonstrates clearly the effect of the small angle scattering events (Fig. 7). By companying the difference plot for (a2 + c~3) particles with that for (oh + c~4) particles we may conclude that the correlation distance of these distortions is equal at least 0.5 mm. This kind of distortions is absent over the region of the nuclear emulsion which is at large distances (~ 10 ram) from its edge. Also the distortions which can be explained by the model of two local sharp screw like deformations of the nuclear emulsion have been detected. REFERENCES 1. Yu.A.Batusov, L.M.Soroko, V.V.Tereshchenko, Comm. JINR E13-92-179, Dubna, 1992
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Pergmon
1350-4487(95)00242-1
EXPERIMENTS ON MESO-OPTICAL FOURIER TRANSFORM MICROSCOPE WITH DOUBLE FOCUSING
Yu. A. BATUSOV, L. M. SOROKO and V. V. TERESHCHENKO Joint Institute for Nuclear Research, Dubna, 141980, Moscow Region, Russia
ABSTRACT There are described two experiments on meso-optical Fourier transform microscope with double focusing, one with nuclear emulsion, exposed by the accelerated Ne-nucleus, and another, in which the primary particles were the accelerated Oxigen-nucleus. It is shown that the measurement error of the orientation angle 0~u is equal to -t-1.5 angular minutes. Three kinds of the geometrical distortions in the nuclear emulsion have been detected. KEYWORDS Particle track; nuclear emulsion; microscope; meso-optics; double focusing; geometrical distortions; accelerated Ne- and Oxigen-nuclei. FIRST EXPERIMENT The meso-optical Fourier transform microscope (MFTM) with double focusing for particle tracks of low ionization level in the nuclear emulsion has been described in [1]. The new prototype of the MFTM with double focusing is provided with one spherical frontal immersion lens and has two stereoscopic arms inclined at the angles +30 ° with the main optical axis (Fig. 1), where 1 - spherical frontal immersion lens, 2 - cylindrical objectives, 3 - plane mirrors, 4 - double mirror, 5 - plain mirror, 6 - photosensitive matrix of the CCD, L and R the left and the right meso-optical images, d - the width of the field of view, D - the length of the field of view, and h - the depth of the nuclear emulsion. The scattering event of the particle, shown in Fig. 2, manifests itself in the MFTM as a local jump of the orientation angle 0xy presented versus longitudinal coordinate x (Fig. 3). The observer sees this event as appearance of two pairs of the meso-optical images (Fig. 4), for the particle track A and for the particle track B. The orientation angle 0~y (D~ in pixels) and the dip angle Oz (D u in pixels) of the straight line track of the Oxygen nucleus are presented in Fig. 5 over the length of 10 mm. These data were estimated by the MFTM without any measurements of the spatial coordinates of the differential parts of the whole particle track. The typical standard error of our measurements is of the order of -t-1.5 angular minute for the orientation angle 0~y. We see also in Fig. 5 weak monotonic variation of the dip angle 0z (Dy). This effect is a common one for all particle tracks in this region of the nuclear emulsion, as we can deduce from Fig. 6, where the values of Dy are given for five different particle tracks. The mean value of the observed monotonic variations is equal to 0.65 pixel/mm. This effect can be explained by the forced bending of the glass support of the nuclear emulsion layer in the course of the drying during the photochemical treatment. 753
754
Yu. A. BATUSOV et al.
SECOND EXPERIMENT Another kind of the geometrical distortions of the nuclear emulsion layer, detected by the traditional optical microscope with precise mechanical stage, was observed near the edge of the nuclear emulsion. Only the difference plots (y2- y3) and (z2-z3) for c~2-and a3-particles, which are mutual very close over the length of ~ 25 mm, demonstrates clearly the effect of the small angle scattering events (Fig. 7). By companying the difference plot for (a2 + c~3) particles with that for (oh + c~4) particles we may conclude that the correlation distance of these distortions is equal at least 0.5 mm. This kind of distortions is absent over the region of the nuclear emulsion which is at large distances (~ 10 ram) from its edge. Also the distortions which can be explained by the model of two local sharp screw like deformations of the nuclear emulsion have been detected. REFERENCES 1. Yu.A.Batusov, L.M.Soroko, V.V.Tereshchenko, Comm. JINR E13-92-179, Dubna, 1992
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