公开(公告)号：US3878541A

公开(公告)日：1975-04-15

申请号：US47913774

申请日：1974-06-13

Applicant: RCA CORP

Inventor： DODSON III GEORGE BERTRAM

IPC: G01F23/24 ,  G08B21/00

CPC classification number: G01F23/247 ,  Y10T307/779

Abstract: Apparatus for sensing when the liquid in a tank falls below, or rises to, a predetermined level includes a plug mounted in the wall of the tank at the predetermined level. A reference semiconductor device is mounted in the plug with thermal coupling to the tank, and thus also to the liquid in the tank. A levelsensing semiconductor device and a series resistor are mounted in the plug with thermal coupling to the interior of the tank and to liquid when present at the predetermined level. A source of potential is connected to supply a current through a resistor to the reference semiconductor device, and to the level-sensing semiconductor and series resistor. A differential comparator has individual inputs connected across the respective semiconductor devices, and has an output connected to a level limit indicator such as a lamp or buzzer.

Abstract translation: 用于感测罐中的液体何时下降或上升到预定水平的装置包括安装在罐的壁中的预定水平的插头。 参考半导体器件安装在插头中，与热耦合到容器，从而也可以连接到罐中的液体。 液位检测半导体器件和串联电阻器安装在插头中，当存在于预定水平时，热连接到罐体的内部并且与液体连接。 电位源被连接以通过电阻器向参考半导体器件以及电平感测半导体和串联电阻器提供电流。 差分比较器具有连接在各个半导体器件上的各个输入，并且具有连接到诸如灯或蜂鸣器的电平限制指示器的输出。

公开(公告)号：US3872329A

公开(公告)日：1975-03-18

申请号：US44882674

申请日：1974-03-07

Applicant: RCA CORP

Inventor： DODSON III GEORGE BERTRAM

IPC: H03F17/00 ,  H03K3/42 ,  G01J1/32

CPC classification number: H03F17/00

Abstract: A phototransistor provides an output current via a circuit node to a current path. An operational amplifier connected at its noninverting input terminal to ground and at its inverting input terminal to the node provides a feedback signal to the base of the phototransistor in a sense to establish the node at a virtual ground for maintaining the phototransistor output current equal to a fixed current withdrawn by the current path.

Abstract translation: 光电晶体管通过电路节点向当前路径提供输出电流。 在其非反相输入端子连接到地和在其反相输入端子处的节点的运算放大器在光电晶体管的基极处提供反馈信号，以在虚拟地线上建立节点，以保持光电晶体管的输出电流相等 到由当前路径撤回的固定电流。

公开(公告)号：US3892949A

公开(公告)日：1975-07-01

申请号：US46277174

申请日：1974-04-22

Applicant: RCA CORP

Inventor： DODSON III GEORGE BERTRAM

IPC: G06K7/016 ,  G06K7/10 ,  G08C9/06

CPC classification number: G06K7/0166

Abstract: A circuit for detecting transitions in an alternating signal representing binary information where the signal exhibits other than sharp transitions from one level to the other and requires other than uniform time lapse to complete a transition. The signal is fed to circuitry for producing signals determining whether a transition is occurring and the polarity of the transition. Signals from the transition detecting circuit are clocked into two N bit registers at a rate substantially faster than the frequency of the alternating signal. Bits in ascending order in one register are compared with bits in decending order in the other register. When complete correspondence occurs, and when signals indicating a transition occur in preselected bit positions, a pulse is produced indicating a transition and indicating in effect the time that the transition occurs.

Abstract translation: 用于检测表示二进制信息的交替信号中的转变的电路，其中所述信号表现出除了从一个电平到另一个电平的急剧转变之外，并且需要不同于均匀的时间间隔以完成转换。 该信号被馈送到用于产生确定转变是否正在发生的信号和转换的极性的电路。 来自转换检测电路的信号以比交流信号的频率快得多的速率被计时到两个N位寄存器。 在一个寄存器中按升序排列的位与另一个寄存器中的递减顺序与位进行比较。 当发生完全对应时，并且当指示在预选位位置发生转换的信号时，产生指示转换的脉冲，并且实际上表示转换发生的时间。

公开(公告)号：US3892950A

公开(公告)日：1975-07-01

申请号：US46277074

申请日：1974-04-22

Applicant: RCA CORP

Inventor： DODSON III GEORGE BERTRAM

IPC: G06K7/016 ,  G06K7/10 ,  G08C9/06

CPC classification number: G06K7/0166

Abstract: A circuit for detecting transitions in an alternating signal representing binary information which signal may lack uniform peaks and sharp transitions. The signal is impressed simultaneously on a delay line and a rate of change circuit. A given fraction of the sum of the delayed and undelayed alternating signal is stored in a sample and hold circuit under control of a signal from the rate of change detector. The sample and hold signal and the delayed signal are impressed on a comparator circuit, the output of which is indicative of the binary value of the alternating signal at any given time.

Abstract translation: 用于检测表示二进制信息的交替信号中的转变的电路，该信号可能缺少均匀的峰值和尖锐的转变。 在延迟线和变化率电路上同时施加信号。 延迟和未延迟的交变信号的和的给定分数在来自变化率检测器的信号的控制下存储在采样和保持电路中。 采样保持信号和延迟信号施加在比较器电路上，该比较器电路的输出表示在任何给定时间的交变信号的二进制值。