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Sensor dan Data Acquisition
Mekatronika, STT Mandala
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Sistem Pengukuran
Sensor: alat yang mengkonversi besaran fisik menjadi besaran listrik yg siap untuk dimanipulasi (tegangan, mis 0-5 V, arus 4-20 mA Signal conditioning: tahanan menjadi tegangan, menyaring, amplifier
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Sensor Posisi
•Potensiometer (translasi atau rotasi) •LVDT (linear variable differential transformer) •Rotary Encoder
Potensiometer
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LVDT
skematik Output sensor
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Rotary Optical Encoder
Binary code 4 bit Skematik
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Sensor Gerak
• Kecepatan (mis: ultrasonic) • Percepatan (accelerometer)
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Accelerometer
Cantilever beam spring mass system
Piezoelectric accelerometer dan rangkaian ekivalennya
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Sensor regangan dan tegangan
Foiled resistance strain gage
Jembatan Wheatstone untuk konversi dari tahanan ke tegangan
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Sensor Gaya
Strain gages load cell
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Sensor Temperatur
• RTD • Thermistor • Thermocouple
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RTD dan Thermistor
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Thermocouple
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Sensor Tekanan
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Signal Conditioning • Konversi besaran sinyal (Wheatstone bridge, voltage
divider dll) • Amplifier (memperbesar tegangan sinyal input menjadi
tegangan yg bisa diproses oleh sistem akuisisi data) • Filter (menyaring sinyal dengan frekuensi yg diinginkan
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Data Acquisition
•Sampling dan Aliasing •Quantization •DAC/ADC
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Sampling
Shannon’s sampling theorem
fs > 2fmax
∆t = 1/fs
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Aliasing
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Quantization
N = 2n Jumlah kemungkinan hasil pengukuran Di mana n adalah jumlah bit
Quantisasi analog (resolusi) range
Bit yg diperlukan untuk resolusi Q yg diinginkan
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Analog to Digital Converter
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Data Acquisition System
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Ilustrasi