Sensor posisi linear digunakan untuk mendeteksi posisi kamera pada suatu saat tertentu. Hal ini untuk mengimplementasikan fitur set start point dan set end point oleh pengguna. Hal yang paling bermasalah adalah menentukan sensor posisi linear dengan akurasi yang sangat tinggi, presisi yang sangat tinggi, dan resolusi yang sangat kecil. Ya, hal itu sangat sulit. Berikut ini ada beberapa pilihan sensor posisi linear.
1. Capacitive transducer
2. Capacitive Displacement Sensor
3. Eddy-current sensor
4. Ultrasonic sensor
5. Grating sensor
6. Hall effect sensor
7. Inductive non-contact position sensor
8. Laser Doppler Vibrometer
9. Linear Variable Differential Transformer (LVDT)
10. Multi-axis Displacement Transducer
11. Photodiode Array
12. Piezo-electric transducer
13. Potentiometer
14. Proximity Sensor
15. Seismic Displacement Pick-Up
16. String potentiometer.
Pemilihan sensor yang sesuai dilakukan berdasarkan spesifikasi yang diinginkan.
1. Akurasi dan presisi dengan resolusi <1.0mm
2. Harga murah
3. Interfacing mudah
4. Mampu mengukur posisi hingga jarak 10cm
|
TECHNOLOGY |
RESISTIVE |
CAPACITATIVE |
INDUCTIVE |
|||
|
Sensor Type |
Potentiometer |
Capacitative |
AC-LVDT |
DC-LVDT |
LVDT |
LVIT |
|
Range |
0.1 to 20 in. |
0.01 to 0.4 in. |
0.02 to 20 in. |
0.1 to 20 in. |
0.01 to 0.4 in. |
0.2 to 40 in. |
|
Accuracy |
++ |
+++ |
+++ |
+++ |
+++ |
+++ |
|
Resolution |
+ |
+++ |
++++ |
++++ |
++++ |
+++ |
|
Repeatability and hysteresis |
+ |
++++ |
++++ |
++++ |
++++ |
+++ |
|
Linearity |
++ |
++ |
++ |
++ |
++ |
++ |
|
Dynamic response |
+ |
++ |
++ |
++ |
++ |
++ |
|
Temperature tolerance |
+ |
++ |
++++ |
++ |
++++ |
+++ |
|
Resistance to shock and vibration |
– |
+++ |
++++ |
++ |
++++ |
++ |
|
Mechanical overload capacity |
– |
+ |
++++ |
++++ |
++++ |
++++ |
|
Life and long-term reliability |
+ |
+++ |
++++ |
++ |
++++ |
++ |
|
Contact |
Yes |
No |
No |
No |
No |
No |
|
Relative cost |
Low |
Moderate |
Moderate |
High |
Moderate |
Low |
|
Support electronics complexity and cost |
Low |
High |
Moderate |
Low |
Moderate |
Moderate |
|
Legend: ++++Excellent; +++ Very Good; ++ Good; +Fair; – Poor |
|
TECHNOLOGY |
RESISTIVE |
CAPACITATIVE |
INDUCTIVE |
|||
|
Sensor Type |
Potentiometer |
Capacitative |
AC-LVDT |
DC-LVDT |
LVDT |
LVIT |
|
Range |
0.1 to 20 in. |
0.01 to 0.4 in. |
0.02 to 20 in. |
0.1 to 20 in. |
0.01 to 0.4 in. |
0.2 to 40 in. |
|
Accuracy |
++ |
+++ |
+++ |
+++ |
+++ |
+++ |
|
Resolution |
+ |
+++ |
++++ |
++++ |
++++ |
+++ |
|
Repeatability and hysteresis |
+ |
++++ |
++++ |
++++ |
++++ |
+++ |
|
Linearity |
++ |
++ |
++ |
++ |
++ |
++ |
|
Dynamic response |
+ |
++ |
++ |
++ |
++ |
++ |
|
Temperature tolerance |
+ |
++ |
++++ |
++ |
++++ |
+++ |
|
Resistance to shock and vibration |
– |
+++ |
++++ |
++ |
++++ |
++ |
|
Mechanical overload capacity |
– |
+ |
++++ |
++++ |
++++ |
++++ |
|
Life and long-term reliability |
+ |
+++ |
++++ |
++ |
++++ |
++ |
|
Contact |
Yes |
No |
No |
No |
No |
No |
|
Relative cost |
Low |
Moderate |
Moderate |
High |
Moderate |
Low |
|
Support electronics complexity and cost |
Low |
High |
Moderate |
Low |
Moderate |
Moderate |
|
Legend: ++++Excellent; +++ Very Good; ++ Good; +Fair; – Poor |
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