公开(公告)号：US3720093A

公开(公告)日：1973-03-13

申请号：US3720093D

申请日：1970-12-03

申请人： US NAVY

发明人： GILL G

IPC分类号： G01N27/18 ,  G01N31/00

CPC分类号： G01N27/185

摘要： A pair of thermistors isolated from one another in a detector housing, are responsive to a gas sample and a reference sample to vary their impedances as a result of the different thermal conductivities of the gases. Varying the impedances unbalances a resistance bridge circuit to provide a signal representative of the percentage concentration of carbon dioxide in the gas sample. Humidifying the gas sample to a predetermined magnitude equaling the relative humidity of the reference gas, providing a spacious heat sink for maintaining the gas sample and reference sample at the same temperature, and providing baffles for preventing the direct impingement of the gas sample onto a thermistor greatly ensures a reliable, accurate determination of CO2 concentration. Including operational amplifier circuits, having linear characteristics, and packaging the detector to minimize the effects of vibration and shock greatly increase reliability over contemporary devices.

摘要翻译： 在检测器壳体中彼此隔离的一对热敏电阻响应于气体样品和参考样品，由于气体的不同热导率而改变它们的阻抗。 改变阻抗不平衡电阻桥电路以提供表示气体样品中二氧化碳浓度百分比的信号。 将气体样品加湿到等于参考气体的相对湿度的预定大小，提供宽敞的散热器，用于将气体样品和参考样品保持在同一温度，并提供挡板，以防止气体样品直接撞击到热敏电阻 极大地确保了CO2浓度的可靠准确测定。 包括具有线性特性的运算放大器电路，并封装检测器以最小化振动和冲击的影响，大大提高了当代设备的可靠性。

公开(公告)号：US3735227A

公开(公告)日：1973-05-22

申请号：US3735227D

申请日：1972-01-24

申请人： US NAVY

发明人： GILL G

IPC分类号： H02P1/20

CPC分类号： H02P1/20 ,  Y10S388/903

摘要： A starting circuit for a direct current motor employs a zener diode to sense the back e.m.f. The zener diode is connected to a switch which effectively disconnects a current limiting impedance out of the armature circuit when the motor has obtained operating speed. In one arrangement, two zener diodes are used in combination to provide an adjustable control for the switching point. Another disclosed arrangement includes a current amplifier connected between the zener diode and the switch to provide for operation of the switch having a relatively high operating power requirement.

摘要翻译： 用于直流电动机的起动电路采用齐纳二极管来感测后面的电动机。 齐纳二极管连接到开关，当电动机获得操作速度时，该开关有效地将电流限制阻抗从电枢电路断开。 在一种布置中，组合使用两个齐纳二极管以为切换点提供可调整的控制。 另一公开的布置包括连接在齐纳二极管和开关之间的电流放大器，以提供具有相对高的工作功率需求的开关的操作。