Sensor danData Acquisitioncontoh. Beating ∆t=0.75 ∆t=0.05. Ilustrasi Bandwidth daritrack...
Transcript of Sensor danData Acquisitioncontoh. Beating ∆t=0.75 ∆t=0.05. Ilustrasi Bandwidth daritrack...
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Sensor dan Data Acquisition
Mekatronika, STT Mandala
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• Sensor
• Pengkondisian sinyal
• Transmisi data
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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
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Data Acquisition
•Sampling dan Aliasing
•Quantization
•DAC/ADC
•Virtual Instrumentation
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Sampling
Shannon’s sampling theorem
fs > 2fmax
∆t = 1/fs
Sampling rate Niquist frequency
Time interval
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Aliasing
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Ilustrasi
Tinjau sebuah fungsi:
Jika a dan b sangat dekat maka suku ini akan
sangat kecil dibanding suku di sebelahnya maka fenomenanya : beating
contoh
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Beating
∆t=0.75
∆t=0.05
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Ilustrasi
Bandwidth dari track musik adalah sebesar 15 kHz, berapakah sampling
rate minimum yg diperlukan untuk mendigitisasi track tsb agar dpt disimpan
dalam compact disk (CD)
Solusi : bandwidth = 15 kHz maka
fs> 2x fmax
fs > 2x 15 kHz
fs> 30 kHz
∆t=1/fs < 0.00003333 s
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Quantization
N = 2nJumlah 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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Ilustrasi
Tentukan resolusi terkecil dari ADC 4 bit, dengan output tegangan maksimum
sebesar 12 V
Q=(12-0)/24-1=12/15=0.8 V
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Analog to Digital Converter
Successive
approximation
ADC
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Digital to analog converter
LSB atau bit ke N, adalah resolusi Q
Output full scale
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Ilustrasi
• Tentukan output DAC dengan input
10011001
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Contoh Data Acquisition System
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Transmisi Data
Paralel (LPT)
Serial (COM, USB)
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Ilustrasi
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Virtual Instrumentation
Virtual instrumentation dengan Labview
GUI
Block Diagram
Control pallete
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Sample the audio data
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PR 2 – please download from
website