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公开(公告)号：US3638044A
公开(公告)日：1972-01-25
申请号：US3638044D
申请日：1970-03-04
Applicant: BECKMAN INSTRUMENTS INC
Inventor： PITTMAN CORNELIUS P
Abstract: An electronic circuit for producing high-voltage short-duration pulses including means for superimposing an input pulse on the voltage level of a first power supply and switching means for alternately placing on an output line the voltage of a second power supply and the output of the voltage superimposing means so that the total voltage rise of the output pulse is equal to the sum of the voltage of the input pulse and the total voltage differential between the first power supply and the second power supply. This circuit lends itself to cascading such that each additional stage will add to the output of the previous stage a voltage equal to the voltage differential between the first and second power supply, thus allowing the production of a highvoltage short-duration pulse without the necessity of highvoltage switching components or high-voltage power supplies.
Abstract translation: 一种用于产生高压短时间脉冲的电子电路，包括用于将输入脉冲叠加在第一电源的电压电平上的装置和用于交替地放置在输出线上的第二电源的电压和第二电源的输出的开关装置 电压叠加装置，使得输出脉冲的总电压上升值等于输入脉冲的电压与第一电源与第二电源之间的总电压差之和。 该电路本身可以级联，使得每个附加级将向前级的输出添加等于第一和第二电源之间的电压差的电压，从而允许产生高电压短时脉冲，而不产生 高压开关元件或高压电源的必要性。
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公开(公告)号：US3635075A
公开(公告)日：1972-01-18
申请号：US3635075D
申请日：1970-06-29
Applicant: BECKMAN INSTRUMENTS INC
Inventor： GILBERT PAUL T
CPC classification number: G01N13/04
Abstract: An osmometer of the type having an osmotic membrane rigidly fitted to a cell having an inner space filled with a reference solvent is disclosed. The outer surface of the membrane is adapted to be in contact with the liquid solution whose osmotic pressure is to be measured. The inner surface of the membrane is in contact with the solvent. A pressure transducer membrane having two sides is positioned with one side in contact with the solvent so as to respond to the osmotic pressure developed across the osmotic membrane. Means are provided for transmitting to each side of the transducer membrane any change of mechanical and hydraulic pressure that may occur at the osmotic membrane whereby the transducer membrane responds only to the osmotic pressure. In one embodiment means are also provided for balancing the osmotic pressure with a hydraulic pressure.
Abstract translation: 公开了一种具有刚性配合到具有填充有参考溶剂的内部空间的电池的渗透膜的类型的渗透计。 膜的外表面适于与要测量渗透压的液体溶液接触。 膜的内表面与溶剂接触。 具有两侧的压力传感器膜被定位成一侧与溶剂接触，以便响应穿过渗透膜产生的渗透压。 提供了用于向换能器膜的每一侧传送可能在渗透膜处发生的机械和液压的变化的装置，由此换能器膜仅响应于渗透压。 在一个实施例中，还提供了用于平衡渗透压与液压的装置。
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公开(公告)号：US3617916A
公开(公告)日：1971-11-02
申请号：US3617916D
申请日：1969-07-24
Applicant: BECKMAN INSTRUMENTS INC
Inventor： SMITH LELAND B
CPC classification number: H03K17/6264 , H03F3/72
Abstract: The invention discloses a new and improved muliplex system wherein each of a multiplicity of inputs are sequentially connected by a switched differential input amplifier stage to a common output amplifier stage. Each input stage is rendered operative and inoperative by a control circuit through which bias current to the input stage is either supplied or denied. The control circuit consists of a switched transistor current source connected to the emitters of a differentially connected pair of transistors comprising the input amplifier stage. The respective transistor collectors of all the input stages are connected in parallel to the common output amplifier stage. The common output stage is composed of a number of transistors connected to provide a differential input and a single ended output. Feedback may be provided from the single ended output to each of the multiple inputs by either an operational or potentiometric configuration. By reason of the switched transistor current source control circuit connected to the differential input stage and the feedback from the single ended output to the multiple inputs, a combined switching speed and amplifier accuracy are provided that heretofore were not possible.
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44.发明授权Paramagnetic gas sensor having capacitive position sensing and ac null balancing feedback 失效具有电容位置传感和AC空余平衡反馈的参考气体传感器
公开(公告)号：US3612991A
公开(公告)日：1971-10-12
申请号：US3612991D
申请日：1969-10-24
Applicant: BECKMAN INSTRUMENTS INC
Inventor： GREENE MALBONE W
CPC classification number: G01N27/74
Abstract: Apparatus for determining the partial pressure of a paramagnetic gas in a gas mixture wherein a pivotally mounted test body is supported in an inhomogeneous magnetic field, the test body being deflected from a null position when the paramagnetic gas is present, the improvement wherein an AC bridge circuit is utilized, in response to deflection of the test body from the null position, to generate an AC signal indicative of the partial pressure of the paramagnetic gas. The bridge circuit comprises a pair of electrostatic vanes which, in conjunction with the test body, form capacitive elements of the bridge circuit. The AC signal is either measured to determine the test body position, or demodulated to provide a DC signal. The DC signal may be fed back to the bridge circuit to return the test body to the null position for improved linearity and stability. Apparatus is further provided to vary the fraction of the DC signal fed back to the bridge circuit with changes in temperature of the test body to compensate the apparatus for temperature variations.
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45.发明授权Paramagnetic gas sensor employing ac position sensing and electrostatic dc null balancing 失效使用交流位置传感和静电DC空白平衡的参考气体传感器
公开(公告)号：US3612990A
公开(公告)日：1971-10-12
申请号：US3612990D
申请日：1969-10-24
Applicant: BECKMAN INSTRUMENTS INC
Inventor： DUCA ANTHONY DEL
CPC classification number: G01N27/74
Abstract: Apparatus for determining the partial pressure of a paramagnetic gas in a gas mixture wherein a pivotally mounted test body, in the form of two hollow spheres in a dumbbell configuration, is supported in an inhomogeneous magnetic field, the test body being deflected from a null position when the paramagnetic gas is present and being restored to the null position by an electrostatic force, the magnitude of the restoring force being a function of the partial pressure of the paramagnetic gas, the improvement wherein mechanical constraints are provided to prevent excessive rotation or linear deflection of the test body. The mechanical constraint consists of at least two, and preferably four, electrostatic pole pieces positioned very close to the dumbbells on opposite sides thereof for limiting the deflection of the test body. In addition, the four pole pieces may be electrically cross-connected to form a capacitance bridge whereby deflection of the test body from its null position unbalances the bridge providing an output signal which may be fed back to the pole pieces to restore the test body to the null position.
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Patent Agency Ranking
公开(公告)号：US3611353A
公开(公告)日：1971-10-05
申请号：US3611353D
申请日：1969-03-26
Applicant: BECKMAN INSTRUMENTS INC
Inventor： SHIPP RICHARD E , SMITH GEORGE W
Abstract: This disclosure relates to a digital-to-analog converter having digital integrated circuit switches in place of the heretoforeused analog switches. A multiplicity of digital input leads are connected to at least one digital integrated circuit having a plurality of digital transistor switches. A multiplicity of resistors are connected between a common terminal and the digital switches. In order to accommodate the use of digital switches in the place of analog switches, a compensating reference voltage source is connected to the digital integrated circuit and also to a reference input of an analog operational amplifier. The signal input of the operational amplifier is connected to the common terminal of the resistors. By selective operation of the digital switches, the various resistors are connected between the compensating voltage reference source and the signal input of the operational amplifier. The currents produced thereby are summed by the operational amplifier to produce an analog output voltage in proportion to the current sum. The compensating reference voltage source in the circuit configuration disclosed allows the use of digital integrated circuit switches heretofore not possible.
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公开(公告)号：US3611042A
公开(公告)日：1971-10-05
申请号：US3611042D
申请日：1970-02-02
Applicant: BECKMAN INSTRUMENTS INC
Inventor： BORONKAY ATTILA DENES
Abstract: A radiant energy analyzer is disclosed in which a feedback loop is included to vary an electrical bias to a radiant energy detector in response to selected conditions associated with an electrical signal generated by the detector. The electrical signal is directed to a selective detector where predetermined portions of the signal are detected to develop a control signal. A time constant compensating circuit is connected to receive the control signal from the selective detector. An amplitude modulated oscillator is connected to the time constant compensating circuit and in turn to a rectifier circuit which provides electrical bias for the radiant energy detector in response to the oscillator signal amplitude. An overload protection circuit is provided to connect the signal from the radiant energy detector to the oscillator when the signal exceeds a predetermined threshold. The time constant compensating circuit provides compensation for unequal rise and fall time constants associated with the rectifier circuit so as to include the rectifier circuit within the feedback loop.
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公开(公告)号：US3605030A
公开(公告)日：1971-09-14
申请号：US3605030D
申请日：1967-06-26
Applicant: BECKMAN INSTRUMENTS INC
Inventor： ELMORE MARSHALL D
Abstract: A high sensitivity electrometer employing a capacitor to accumulate an electronic charge over a relatively long period and a first switch for coupling the charge to an operational amplifier over a short period. An inverting capacitively coupled amplifier drives a storage circuit comprising a peak detector and memory capacitor. A second switch synchronized with the first switch couples the storage circuit to the operational amplifier through a filter network to apply the stored peak voltage in the memory capacitor as a direct coupled electrometer input signal.
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公开(公告)号：US3600013A
公开(公告)日：1971-08-17
申请号：US3600013D
申请日：1970-03-16
Applicant: BECKMAN INSTRUMENTS INC
Inventor： DOERING JOHN P JR
CPC classification number: F16D1/0847 , Y10T403/7049
Abstract: A rotor assembly for attaching a rotor member to a rotatable shaft including a shaft opening through which is positioned a rotary shaft. A U-shaped retainer is also positioned through the shaft opening between the shaft and the sidewall of the opening with one leg of the U-shaped retainer positioned against a rear surface of the rotor block and the other leg of the retainer positioned within a slot formed in the front face of the rotor block. Within the slot, between the leg of the retainer and the sidewall of the slot is positioned a setscrew which engages threads formed in the sidewall of the slot, the setscrew bears against the base of the retainer forcing it against the shaft thereby locking the rotor into place against the shaft.
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公开(公告)号：US3591309A
公开(公告)日：1971-07-06
申请号：US3591309D
申请日：1969-06-30
Applicant: BECKMAN INSTRUMENTS INC
Inventor： RAY ROBERT A , HELL AUGUST
CPC classification number: B01F13/0818 , B01D33/15 , B01D33/68
Abstract: A body member is disclosed which has a shape compatible with a discrete sample container and at least one ramp surface for the purpose of propelling and thereby mixing a fluid in a container as the body is rotated. A filter is attached to one end of the body member for the purpose of intercepting unwanted particles and fibers in the fluid. A magnet is embedded in the body to render the mixing body and filter combination responsive to alternating magnetic fields thereby causing rotation.
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