SU136102A1 - Microparticle counter, eg to a television microscope - Google Patents

Description

The proposed microparticle counter, for example, to the one microscopic microscope has an enhanced, in comparison with the known counters, the accuracy of counting and projecting the image of the drug on the transmitting tube} of the type of video recorder. This is achieved by using a video channel pulse switching system in the counter, which provides for the comparison of each previous delayed row in the antimatch scheme with a subsequent straight (un-delayed) line across the entire raster field during one half-frame of a standard television channel. The delay time of the previous line is equal to the length of a single line (64 microseconds), as a result of which the anti-coincidence circuit generates pulses if the edge of the particles lies between the compared adjacent lines.

The device is applicable both to television microscopes with a projection of the image of a preparation on a Vidicon transmission tube, and to television microscopes with a traveling spot tube.

FIG. 1 is a schematic diagram of the microparticle counting; in fig. 2-block diagram of line switching; in fig. 3-diagram of the inclusion of the counter in the set of television microscope.

If one selects a series of pulses of a delayed odd row and compares it on the anti-coincidence circuit with a series of pulses of a straight even row, then particles will be counted, the upper edges of which lie between odd and even rows. To count particles whose edges lie between even and odd lines, it is necessary to have another anti-coincidence scheme, in which you can compare a series of pulses of a delayed even line with a series of pulses of a straight odd line. The sum of the pulses of the two anti-coincidence schemes gives the number of particles located on the raster. All pulses of the first line of the forward channel go to the output of the anti-coincidence circuit. The selected anti-coincidence scheme ensures that only the upper edge of the particles is counted.

No. 1361022 The method of counting particles is practically implemented according to the scheme of a line-mounted electronic switch, shown in FIG. 2. As can be seen from this diagram, each lower-case pulse throws a trigger to the next stable position. With the line frequency, the voltage level at the trigger anodes changes from low to high. According to these levels, the offset on the grids of the electronic switches changes from 50 s (locked halves of the lamps) to 12 in the {open half). Delayed video pulses were applied to both grids of the first switch. The odd (/ ES) and even (II3C) delayed lines are removed from the cathodes of this switch. Likewise, the right video impulse (PPI) is fed to both grids of the second switchboard and odd (1PS} and even (PPS) straight lines are removed).

Four outputs from two electronic com.mutators make it possible to compare a delayed and a direct series of pulses on two anti-matching schemes in the following combinations: the first anti-matching scheme — the delayed odd line; right even line. The second scheme is a delayed even line; The string is odd. Selected pulses of anti-coincidence come to the adder. The pulses removed from the adder, after being formed, are fed to an electronic pulse counter.

After amplification, the video pulses of a television microscope are guided along two channels - the delayed one and the direct one. The required delay value of 64 microseconds consists of two parts: a constant ultrasonic delay of 57 microseconds and a smooth artificial one; 1 line of 8 microseconds. An infinitely adjustable artificial line is used to precisely synchronize the compared strings and to determine the maximum diameter of the microparticles. The moment of exact synchronization of lines is marked by an optical indicator (peephole), since at the time of synchronization the number of pulses at the output of the anti-coincidence circuit increases approximately 16 times.

A circuit for including a microparticle counter in a television microscope kit is shown in FIG. 3. In a television microscope with a transmitting tube of the Vidicon type, a light source / through a copdensor 2 illuminates the preparation 3. Micro-lens 4 and an ocular p 5 project the image of the preparation onto the photosensitive layer of the transmitting tube 6, which through a standard television system 7 transfers the image of the preparation to the kinescope screen 8. The microparticle counter 9, in the form of an attachment, is connected to a standard television system.

Subject invention

A microparticle counter, for example, to a television microscope, different from the fact that, in order to increase the accuracy of counting and projecting the image of the drug on the transmitting tube of the tina Vidicon, a video channel pulse switching system and an anti-coincidence circuit were used to compare each previous delayed line and then; (non-delayed) line on the entire raster field during one half-frame of a standard TV channel with the delay time of the previous line equal to the length of one line.

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