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公开(公告)号：US09176163B2
公开(公告)日：2015-11-03
申请号：US13448075
申请日：2012-04-16
摘要： An anemometer and method for analyzing fluid flow is described. In one embodiment, a transistor sensor is heated by applying power to cause its base-emitter junction to rise from an ambient first temperature to a second temperature. The power is removed, and the Vbe is measured at intervals as the junction cools. The Vbe equates to a temperature of the junction. The temperature exponentially decreases, and the time constant of the decay corresponds to the fluid flow velocity. A best fit curve analysis is performed on the temperature decay curve, and the time constant of the exponential decay is derived by a data processor. A transfer function correlates the time constant to the fluid flow velocity. The transistor is thermally coupled to a metal rod heat sink extending from the package, and the characteristics of the rod are controlled to adjust the performance of the anemometer.
摘要翻译： 描述了用于分析流体流动的风速计和方法。 在一个实施例中，通过施加功率来加热晶体管传感器，以使其基极 - 发射极结从环境温度升至第二温度。 功率被去除，并且Vbe在接头冷却时间隔测量。 Vbe等于交界处的温度。 温度指数下降，衰减的时间常数对应于流体流速。 对温度衰减曲线进行最佳拟合曲线分析，数据处理器得出指数衰减的时间常数。 传递函数将时间常数与流体流速相关联。 晶体管热耦合到从封装延伸的金属棒散热器，并且控制棒的特性以调节风速计的性能。
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公开(公告)号：US20130124112A1
公开(公告)日：2013-05-16
申请号：US13448075
申请日：2012-04-16
摘要： An anemometer and method for analyzing fluid flow is described. In one embodiment, a transistor sensor is heated by applying power to cause its base-emitter junction to rise from an ambient first temperature to a second temperature. The power is removed, and the Vbe is measured at intervals as the junction cools. The Vbe equates to a temperature of the junction. The temperature exponentially decreases, and the time constant of the decay corresponds to the fluid flow velocity. A best fit curve analysis is performed on the temperature decay curve, and the time constant of the exponential decay is derived by a data processor. A transfer function correlates the time constant to the fluid flow velocity. The transistor is thermally coupled to a metal rod heat sink extending from the package, and the characteristics of the rod are controlled to adjust the performance of the anemometer.
摘要翻译： 描述了用于分析流体流动的风速计和方法。 在一个实施例中，通过施加功率来加热晶体管传感器，以使其基极 - 发射极结从环境温度升至第二温度。 功率被去除，并且Vbe在接头冷却时间隔测量。 Vbe等于交界处的温度。 温度指数下降，衰减的时间常数对应于流体流速。 对温度衰减曲线进行最佳拟合曲线分析，数据处理器得出指数衰减的时间常数。 传递函数将时间常数与流体流速相关联。 晶体管热耦合到从封装延伸的金属棒散热器，并且控制棒的特性以调节风速计的性能。
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