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公开(公告)号：FR2182215B1
公开(公告)日：1975-10-31
申请号：FR7315488
申请日：1973-04-27
Applicant: MICROMEDIC SYSTEMS INC
Abstract: The present invention relates to optical instruments, such as photometers including spectrophotometers, and relates more particularly to a light-shifting device of light refracting type for receiving a beam of light used in such instruments and shifting it into one or the other of two parallel paths.
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公开(公告)号：FR2261522A1
公开(公告)日：1975-09-12
申请号：FR7500539
申请日：1975-01-09
Applicant: MICROMEDIC SYSTEMS INC
Abstract: 1487775 Absorbance change measurement MICROMEDIC SYSTEMS Inc 23 Dec 1974 [19 Feb 1974] 55541/74 Heading G1A The change in absorbance per unit time of sample is measured by periodically developing digital signals, each comprising a pulse train having a length proportional to the logarithm of the ratio of the intensities of radiation passed through the sample and a standard, respectively, and utilizing counting apparatus to compare the numbers of pulses generated in two consecutive time intervals forming two sequential digital signals. Photo-electric absorption measurement system, Fig. 1. A wide band optical source 104 illuminates a mono-chromator section 200, including inlet and outlet apertures 215, 216 and a diffraction grating 201. The selected wavelength is displayed on monitor 800. When red, infrared or ultraviolet light is used, an extra filter appropriate to the radiation is introduced by slide 205, so as to prevent stray or second order diffraction light reaching the sample. The sample and reference cuvette section 300 may be supplied intermittently or continuously with fluids. The optical beam is switched between illumination of the sample and the reference by a pair of quartz, plastics or glass cross-mounted elongated prismatic elements 401, 402. A synchronization 600 coupled to sense which of the sample and reference is being illuminated controls delivery of the signal developed by photo-multiplier 501 sensing transmitted beam to the evaluation circuit 700. A prism 52 directs the alternate beams on to the detector 501. Detector and counting circuit, Fig. 2. A clock 806 periodically stimulates generation of an exponentially decaying signal from circuit 808. Applied to inputs 810, 812 are voltages representing the detector output for the reference and sample transmissions respectively. As the exponential signal falls below these negative voltage levels, as sensed by comparators 802, 804, a constant height pulse of duration logarithmically proportional to the difference between the voltages is produced from Exclusive -OR gate 818. This is converted into a digital signal i.e. a pulse train by oscillator 902 and gate 904. Depending on which is greater of the sample and reference voltages, up or down counting is initiated in counters 912, 914. Except for the first timing interval, the counters operate as follows:- counter 912 counts the currently supplied pulses in a digital signal and at the end of the interval transfers this number to counter 914, after which it is cleared; counter 914 counts in the opposite direction to counter 912 and so effectively subtracts the current member from the number for the previous digital signal, timing interval; thereby at the end of the timing interval, having accumulated therein an absorbance difference representative number. If there is a difference, this is printed out at 916. Other parts of Fig. 2 circuit are for scaling so that the printer provides the required units. Variations on the repetition rate and length of timing intervals are possible. Counters 912, 914 may be arranged to subtract alternately, the other counter storing the number for the current digital signal.
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公开(公告)号：IT991565B
公开(公告)日：1975-08-30
申请号：IT6817773
申请日：1973-04-27
Applicant: MICROMEDIC SYSTEMS INC
Abstract: The present invention relates to optical instruments, such as photometers including spectrophotometers, and relates more particularly to a light-shifting device of light refracting type for receiving a beam of light used in such instruments and shifting it into one or the other of two parallel paths.
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公开(公告)号：SE7501739L
公开(公告)日：1975-08-20
申请号：SE7501739
申请日：1975-08-20
Applicant: MICROMEDIC SYSTEMS INC
Inventor： JOHNSON JR E G , LAWSON C V , STONECYPHER T E
Abstract: 1487775 Absorbance change measurement MICROMEDIC SYSTEMS Inc 23 Dec 1974 [19 Feb 1974] 55541/74 Heading G1A The change in absorbance per unit time of sample is measured by periodically developing digital signals, each comprising a pulse train having a length proportional to the logarithm of the ratio of the intensities of radiation passed through the sample and a standard, respectively, and utilizing counting apparatus to compare the numbers of pulses generated in two consecutive time intervals forming two sequential digital signals. Photo-electric absorption measurement system, Fig. 1. A wide band optical source 104 illuminates a mono-chromator section 200, including inlet and outlet apertures 215, 216 and a diffraction grating 201. The selected wavelength is displayed on monitor 800. When red, infrared or ultraviolet light is used, an extra filter appropriate to the radiation is introduced by slide 205, so as to prevent stray or second order diffraction light reaching the sample. The sample and reference cuvette section 300 may be supplied intermittently or continuously with fluids. The optical beam is switched between illumination of the sample and the reference by a pair of quartz, plastics or glass cross-mounted elongated prismatic elements 401, 402. A synchronization 600 coupled to sense which of the sample and reference is being illuminated controls delivery of the signal developed by photo-multiplier 501 sensing transmitted beam to the evaluation circuit 700. A prism 52 directs the alternate beams on to the detector 501. Detector and counting circuit, Fig. 2. A clock 806 periodically stimulates generation of an exponentially decaying signal from circuit 808. Applied to inputs 810, 812 are voltages representing the detector output for the reference and sample transmissions respectively. As the exponential signal falls below these negative voltage levels, as sensed by comparators 802, 804, a constant height pulse of duration logarithmically proportional to the difference between the voltages is produced from Exclusive -OR gate 818. This is converted into a digital signal i.e. a pulse train by oscillator 902 and gate 904. Depending on which is greater of the sample and reference voltages, up or down counting is initiated in counters 912, 914. Except for the first timing interval, the counters operate as follows:- counter 912 counts the currently supplied pulses in a digital signal and at the end of the interval transfers this number to counter 914, after which it is cleared; counter 914 counts in the opposite direction to counter 912 and so effectively subtracts the current member from the number for the previous digital signal, timing interval; thereby at the end of the timing interval, having accumulated therein an absorbance difference representative number. If there is a difference, this is printed out at 916. Other parts of Fig. 2 circuit are for scaling so that the printer provides the required units. Variations on the repetition rate and length of timing intervals are possible. Counters 912, 914 may be arranged to subtract alternately, the other counter storing the number for the current digital signal.
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公开(公告)号：CA971783A
公开(公告)日：1975-07-29
申请号：CA172424
申请日：1973-05-28
Applicant: MICROMEDIC SYSTEMS INC
Inventor： SANZ MANUEL C , REVILLET GEORGES
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Patent Agency Ranking
公开(公告)号：NL7413309A
公开(公告)日：1975-04-14
申请号：NL7413309
申请日：1974-10-09
Applicant: MICROMEDIC SYSTEMS INC
Abstract: The invention is concerned with a novel container for receiving a liquid material having a fitting at one end adapted to provide a discharge port for the liquid within the container and having at its other end a plunger or piston adapted to be moved within the inside wall of the container to discharge one or more predetermined "aliquots" or "doses" of liquid from the container through the port. The invention also comprises a novel device adapted to receive a liquid-containing cartridge or package of the type just mentioned and having means for coacting with the package to move the plunger within the container during dose-dispensing or -discharge in such a manner as to gradually accelerate movement of the plunger from a position of rest within the container through a maximum rate of motion and then gradually decelerate the motion of the plunger to a final position at the end of the dose-discharge. The device also comprises means for accurately predetermining or "measuring" the amount of liquid discharged during each individual movement of the plunger. The device may comprise means for repeatedly actuating the piston with an accelerating-decelerating movement to discharge a plurality of measured samples repeatedly under non-spurt and non-splash conditions.
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公开(公告)号：SE7412713A
公开(公告)日：1975-04-11
申请号：SE7412713
申请日：1974-10-09
Applicant: MICROMEDIC SYSTEMS INC
Inventor： DOWNING H T , STURGIS B E
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公开(公告)号：FR2183482A5
公开(公告)日：1973-12-14
申请号：FR7315489
申请日：1973-04-27
Applicant: MICROMEDIC SYSTEMS INC
Abstract: 1435374 Discharging liquids by gaseous pressure MICROMEDIC SYSTEMS Inc 25 April 1973 [1 May 1972] 19565/73 Heading F1R [Also in Division G1] Liquid is transferred from a vessel 18 through a dip tube 22 by applying air-pressure to the vessel through an opening 82 so that the flow of air passes over the dip tube to clean it. Air is supplied to a chamber 78 in a head 54 and through which the tube 22 passes and flows to the opening 82 and also to an opening 74. The vessel 18 is mounted on a guide which is raised to cause the mouth of the vessel to seat on a seal 62 in the head 54. Further raising causes the mouth of the opening 74 to engage a seal 72 on a plate 70 and the dip tube to enter the vessel. The quantity of liquid discharged may be controlled by a solenoid actuated valve (26) Fig. 6 (not shown) controlled by a timing device (108) started when a rise in pressure in the vessel due to closing of the opening 74 is detected. In a modification, Fig. 5, a crank mechanism 146 operates a slide 142 round which the dip tube 152 is looped so that the tube is inserted into the vessel 120 in a separate operation. As described the apparatus comprises pairs of vessels and duplicate discharge arrangements.
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