自動檢測技術及儀表控制系統(tǒng)課后習題答案-資料下載頁
2024-10-19 10:46本頁面
【導讀】1．開閉環(huán)儀表各有何優(yōu)缺點？3．一階系統(tǒng)的計算；4．儀表的誤差與等級方面的計算。2．檢測儀表的組成與各部分的作用P2圖1。的測試要求，設計測試方案，選傳感器，分析方法，測試步驟，預期結果。C4虛擬儀器的特點。別為：1）液柱式壓力計；2）彈簧式壓力計；3）電器式壓力計；3．測量物位儀表按其工作原理主要有哪些類型？物位儀表；7）光學式物位儀表。氣體或低沸點液體的飽和蒸汽受熱后。性，而當差壓超過使用范圍時，即單向過載時，膜盒不但不壞，在檢修期間可采用掛重校驗法。嚴格地說，補償導線和熱偶電勢并不完全相同。系數(shù)不同，雙金屬片產(chǎn)生角位移，帶動指針指示相應溫度。路加以放大，以滿足顯示記錄裝置的要求。作用是使人們了解被測量的大小或變化的過程。果的分散程度，它反映了隨機誤差的大小。②采用非均勻的指示刻度。
【正文】 hm Platinum RTDs, sometimes referred to as PRTs, Platinum Resistance Thermometers. 5. The Hall effect has been known for over one hundred years, but has only been put to noticeable use in the last three first practical application (outside of laboratory experiments) was in the 1950s as a microwave power the mass production of semiconductors, it became feasible to use the Hall effect in high volume products. MICRO SWITCH Sensing and Control revolutionized the keyboard industry in 1968 by introducing the first solid state keyboard using the Hall effect. For the first time, a Hall effect sensing element and its associated electronics were bined in a single integrated circuit. Today, Hall effect devices are included in many products, ranging from puters to sewing machines, automobiles to aircraft, and machine tools to medical equipment. 6． Although the magnitudes of piezoelectric voltages, movements, or forces are small, and often require amplification (a typical disc of piezoelectric ceramic will increase or decrease in thickness by only a small fraction of a millimeter, for example) piezoelectric materials have been adapted to an impressive range of applications. The piezoelectric effect is used in sensing applications, such as in force or displacement sensors. The inverse piezoelectric effect is used in actuation applications, such as in motors and devices that precisely control positioning, and in generating sonic and ultrasonic signals. 7． A photoelectric sensor is another type of position sensing device. Photoelectric sensors, similar to the ones shown below, use a modulated light beam that is either broken or reflected by the target. The control consists of an emitter (light source), a receiver to detect the emitted light, and associated electronics that evaluate and amplify the detected signal causing the photoelectric’s output switch to change state. We are all familiar with the simple application of a photoelectric sensor placed in the entrance of a store to alert the presence of a customer. This, of course, is only one possible application. n gage that makes up the heart of your transducer is a device that outputs only millivolts, even at the transducer39。s fullscale capacity. This signal is not very useful at such low levels and requires amplification. Some transducer manufacturers givthe option to bundle the amplifier right into the transducer. These accept a w ide pow er range (usually 15 to 28 VDC) and output either an amplified voltage or a current signal. The voltage output signal may be in the range of 0 to 10 volts full scale. Current outputs usually range from 4 to 20mA. Either output represents a linearized, highlevel equivalent of the actual measurement range
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