公开(公告)号：US4862394A

公开(公告)日：1989-08-29

申请号：US8189

申请日：1987-01-28

申请人： David B. Thompson ,  Stanley V. Preskitt ,  Harvey L. Downing ,  Michael V. Allred

发明人： David B. Thompson ,  Stanley V. Preskitt ,  Harvey L. Downing ,  Michael V. Allred

IPC分类号： G01D9/00 ,  G01P1/12 ,  G06F17/40

CPC分类号： G01P1/127 ,  G01D9/005

摘要： A drop height recorder apparatus includes a housing suitable for packaging for shipment from an origin point to a destination point, a triaxial accelerometer provides three signals to corresponding high gain and low gain channels. The three high gain channel signals are full wave rectified to change any negative signals to positive signals for summing into a single high gain "zero G" (free-fall) channel. AN analog to digital converter is connected to the three low gain channels, the single high gain channel, and to auxiliary sensors for digitizing the analog signals. A recorder has a programmable controller connected to the ADC for setting the digital sampling rate. The digitized low gain channel signals are passed through a digital trigger threshold comparator for comparison with a reference signal for generating event detecting trigger signals on the way to a delay memory which also receives the digitized high gain zero G signal and auxiliary signals. In response to a trigger signal the programmable controller reads out of the delay memory preselected numbers of pre-trigger and post-trigger data as an event sample either for a data processing memory for processing the signals for desired information and storage in a storage memory or for a storage memory. A pre-selected number of event waveform signals together with time, date, and auxiliary data signals are stored in the storage memory. After recovery of the instrument, a personal computer can be attached for reading out the stored event waveforms from which the time of free-fall occurring during each event is determined and the drop height in inches computed. The personal computer is used prior to shipment to set the program parameters and operation modes in the programmable controller.

摘要翻译： 液滴高度记录仪装置包括适于从原点到目的地点装运的外壳，三轴加速度计提供三个信号到相应的高增益和低增益通道。 三个高增益通道信号被全波整流，以将任何负信号改变为正信号，用于求和到单个高增益“零G”（自由下降）通道。 AN模数转换器连接到三个低增益通道，单个高增益通道，以及辅助传感器，用于数字化模拟信号。 记录器具有连接到ADC的可编程控制器，用于设置数字采样率。 数字化的低增益通道信号通过数字触发阈值比较器，用于与参考信号进行比较，用于在还接收数字化的高增益零G信号和辅助信号的延迟存储器的路上产生事件检测触发信号。 响应于触发信号，可编程控制器读出延迟存储器预选数量的预触发和后触发数据作为事件样本，用于数据处理存储器，用于处理所需信息的信号和存储在存储存储器中，或者 用于存储存储器。 预先选择的事件波形信号以及时间，日期和辅助数据信号被存储在存储器中。 恢复仪器后，可以安装个人计算机，以读出存储的事件波形，从而确定每个事件期间发生自由落体的时间，并计算下降高度（以英寸为单位）。 出货前使用个人计算机，以便在可编程控制器中设置程序参数和操作模式。