Study Of Pressure Transmitter And Measuring System In The Hydraulic Support

Pressure transmitter is a important part in the electro-hydraulic control system of the support, it is important to monitor pressure and control action of the support. Pressure transmitter made in our country cann't meet the requirement in the properties, however, inward transmitter is precious, so, to design a pressure transmitter which can meet the requirement of the support is important to realize the electro-hydraulic control system.Compared to other pressure transmitter, the transmitter has two features, due to the existence of impact load and explosive gas in the work circumstance, so, hole of damping is needed to reduce the impact, the circuit is required to be safe essentially.Momentum of development, composition and operating principle of the foreign and national transmitter are represent, work environment of support and variation of pressure are analized, technical requirement of pressure transmitter is put forward . Classification and property of hydraumatic pressure sensor are compared, according to the preferred principle of pressure sensor, piezoresistive pressure transmitter is designed . Struction of piezoresistive pressure sensor is discussed, method of current supply of PA-8 pressure sensor is researched, though the lectotype of device, constant-current source circuit is designed. The temperature error is elaborated in detail in zero drift and sensitity drift aspects , method of compensation is suggested, and, compensation circuit is designed. Singal conditioning circuit is designed, circuit is simulated by software PROTEL, the static performance analyse and essence safety analyse are made.Data collection circuit of analog signals is researched, singlechip ATmega16 is chose to be control core, sampling frequency is determined, pressure signal coming from sampling/keeping circuit is transformed to be digital signal through A/D convertion circuit, method of digital filter is analized, median filter and arithmetical mean filter are band together to be complex filter for filtering pressure signal, digital is converted to pressure value which is prone to display and analyse through csale conversion program.The pressure transmitter and its measurement system of the paper have high precision and rapid response speed, requirement suggested by support is meet, so, it is fit for monitoring pressure of support .