Abstract:
The invention relates to a simplified signal processing circuit for processing and analysing signals relating to the status of a force sensing resistor film pressure sensor (10) used in a seat occupation detection device. The circuit provided for by the invention makes use of the fact that an application-specific integrated circuit (3), which in any event is present in a motor vehicle and has digital controlling and regulating functions performed by by a micro control unit (MCU) (2), has a test voltage source (4) which can be switched with very high precision. One end of an electric circuit containing the FSR film (10) is connected to a circuit output VTA of the ASIC (3). The other end of said electric circuit is connected to a port (port0) of the MCU (2). On a reference resistor (R1) connected in series to the FSR film (10), a measuring voltage dependent on current strength which is in turn status-dependent, decreases and crosses the FSR film. Said measuring voltage is fed to an analog/digital converter (ADC) input of the MCU (2) and is transformed into a digital signal indicating the occupation status of the FSR film. In this way, it is possible to evaluate the OCCUPIED / NOT OCCUPIED status of the FSR film (10) and to detect various types of error status by means of only one precisely switchable constant voltage source, one port (port0) of the MCU (2) and one ADC channel.
Abstract:
The proposed measurement device comprises a strain gauge component (10) made up of at least one strain gauge (15) and integrated in a measurement sensor (1). An auxiliary circuit (20) amplifies output signals from the strain gauge component (10) and is similarly integrated in the measurement sensor (1). The measurement device thus created is used for general measurement tasks, in particular for commercially available domestic or industrial scales including battery operated weighing devices. A modulation amplifier, consisting of a modulator in the form of a square-wave generator, an a.c. amplifier and a demodulator, can be used as the auxiliary circuit. The demodulator is a bridge rectifier formed by four electronic (on-off) switches or two electrical two-way switches.
Abstract:
一种称重传感器(100),包括四个电阻式应变片(SG1,SG2,SG3,SG4)、数模转换电路和信号处理器(MP)。信号处理器(MP)能输出实时受载力值F n 和实时状态信息矩阵S t 。一种称重网络(200),包括由数个前述的称重传感器(100)组成的称重传感器阵列(202)、采集外部信息的采集设备(204)和控制终端(206)。一种称重网络(200)监测方法,应用于前述的称重网络(200),控制终端(206)实时采集实时外部信息、各个称重传感器(100)的实时受载力值F n 和实时状态信息矩阵S t ;将实时外部信息、各个称重传感器(100)的实时受载力值F n 和实时状态信息矩阵S t 与称重过程数据库中保存的数据相比较,监测称重网络(200)的状态。
Abstract:
Torque measurement devices, systems, and methods are provided. Exemplary torque measurement devices, systems, and methods include providing rotating electronics and non-rotating electronics configured for remote power transmission and remote interrogation via near field and switched reactance communications. The rotating electronics and the non-rotating electronics can communicate analog information without batteries or a physical connection therebetween.
Abstract:
A sensor device comprises an array of spaced apart sensor elements disposed in a pattern on a substrate. Each sensor element is connected electrically so that a physical variable measured by each sensor element independently can be recorded and/or displayed by an external instrument. The sensing device may be a temperature sensing device, in which case the sensor elements are temperature sensing elements such as negative temperature coefficient (NTC) thermistors. Alternatively the sensing device may be a strain or pressure sensing device, or an optical imaging device, in which case the sensor elements include piezoresistors or photoresistors. The sensor elements may be connected in a common source or write all - read one configuration, in a common output or write one - read all configuration, or in an array comprising X rows and Y columns, in a write X - read Y configuration,
Abstract:
A strain compensated temperature sensor includes a first, temperature dependent resistor, and a second, substantially temperature independent resistor connected in series with the temperature dependent resistor. At least one electrical contact allows an electrical potential difference to be applied across both resistors simultaneously. Both the temperature dependent resistor and the substantially temperature independent resistor are sensitive to mechanical strain. This permits temperature readings from the sensor to be corrected automatically for mechanical distortion of the sensor. The temperature dependent resistor and the substantially temperature independent resistor are of substantially similar construction, preferably being located adjacent one another in or on a common substrate, and hence have a similar response to a mechanical force applied to them.