【正文】 pical value of the sensitivity, the sensitivity of the error will be incremental pressure function (see Figure 1). If the sensitivity is lower than the typical value, then the sensitivity of the error will be decreasing function of pressure. The cause of the error diffusion process is to change. Error: This is an initial error factor less affected, the error is the cause of the physical nonlinear silicon, but with the sensor amplifier, should also include nonlinear amplifier. Linear error curve can be concave curve, it could be a convex curve. Error: In most cases, the lag error can be ignored pletely, because silicon has a higher degree of mechanical stiffness. Changes in general just a lot of pressure to consider the case of hysteresis error.Calibration can eliminate or greatly reduce these errors, and pensation technique is usually required to identify the parameters of the actual transfer function, rather than simply the use of typical values. Potentiometer, adjustable resistance, and other hardware can be used in the pensation process, while the software is able to achieve more flexibility in the work of this error pensation. Calibration method that can eliminate the transfer function against the Agency to pensate the offset drift error, such as the autozero calibration method. Offset zero calibration is usually carried out under pressure, especially in the differential sensor, because under the conditions of the nominal differential pressure is usually 0. For pure sensor offset calibration will be difficult, because it either needs to read a pressure system to measure the atmospheric pressure in the environment under the conditions of the calibration of pressure or need to obtain the pressure of expectations of the pressure controller. Zero differential pressure sensor is very accurate calibration, because the pressure of strict demarcation is 0. On the other hand, the pressure of 0:00 is not the accuracy of the calibration depends on the pressure controller or the performance measurement system. In order to convert the pressure of the output voltage value, usually as a result of the actual sensitivity is unknown, and therefore the mathematical model used for a typical singlepoint calibration sensitivity.That improve the accuracy of the green curve. Here, calibration is trillion 0500 bar (full scale) conditions. As the marked point on the error close to 0, so the pressure of expectations to be the smallest range of measurement error, the correct set of these points, it is particularly important.傳感器的功能就是監(jiān)視系統(tǒng)中的變化，然后將此數(shù)據(jù)反饋給主控制器。 為了用這些“復(fù)阻抗傳感器”實(shí)現(xiàn)測量，必須提供一種交流（AC）激勵(lì)頻率源在傳感器的頻率范圍內(nèi)進(jìn)行掃描。例如，超聲波液流計(jì)會(huì)表現(xiàn)出相位偏移，而接近傳感器會(huì)引起幅度改變。在正常情況下，例如在靜態(tài)條件下，傳感器的L，R和C都具有一個(gè)唯一值，在諧振頻率Fo處具有最大阻抗值。一種簡單、低成本的實(shí)現(xiàn)方法就是采用AD5930波形發(fā)生器。其輸出頻率范圍為0～10 MHz，從而對(duì)選擇傳感器具有很大的靈活性。 系統(tǒng)框圖：通過BF535 DSP處理器設(shè)置AD5930數(shù)字波形發(fā)生器。傳感器的輸出和激勵(lì)頻率源都輸入到AD7266一種12 bit、2 MSPS的同步采樣雙ADC。該方案可能需要許多分立元件，所以是一種高成本的傳感器分析解決方案。 解決上述低頻率傳感器分析問題的解決方案是AD5933/4器件，它將上述主要處理模塊都集成到一顆芯片中?？梢杂?jì)算出每個(gè)頻率點(diǎn)的阻抗，從而可以得出一條頻率與幅度的關(guān)系曲線。頻率分辨率可以達(dá)到27 bit（ Hz）。此實(shí)部和虛部數(shù)據(jù)通過I2C接口以兩個(gè)16 bit字形式提供給用戶。 這種未經(jīng)標(biāo)定的初始誤差由以下幾個(gè)部分組成： ：由于在整個(gè)壓力范圍內(nèi)垂直偏移保持恒定，因此變換器擴(kuò)散和激光調(diào)節(jié)修正的變化將產(chǎn)生偏移量誤差。該誤差的產(chǎn)生原因在于擴(kuò)散過程的變化。一般只需在壓力變化很大的情形中考慮滯后誤差。 偏移量標(biāo)定通常在零壓力下進(jìn)行，特別是在差動(dòng)傳感器中，因?yàn)樵跇?biāo)稱條件下差動(dòng)壓力通常為0。選擇標(biāo)定壓力為了將輸出電壓轉(zhuǎn)換為壓力值，由于實(shí)際的靈敏度往往是未知，因此在數(shù)學(xué)模型中通常采用典型靈敏度進(jìn)行單點(diǎn)標(biāo)定。然而與一點(diǎn)標(biāo)定法相比，該方法可顯著提高系統(tǒng)的精度，因?yàn)樵摲椒ú粌H標(biāo)定了偏移量，還標(biāo)定了傳感器的靈敏度。綠色曲線表示精度提高。在這些應(yīng)用中，可以采用多點(diǎn)標(biāo)定法來得到最理想的結(jié)果。當(dāng)然設(shè)計(jì)工程師要根據(jù)實(shí)際應(yīng)用的精確度要求，選擇最適合的標(biāo)定方法，此外還需要考慮