Ultrasonic Sensor: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
No edit summary |
||
| Line 10: | Line 10: | ||
*2.5% is the general figure. so for 25 cm distance - get 0.6 cm off. | *2.5% is the general figure. so for 25 cm distance - get 0.6 cm off. | ||
*Does that imply that for 5 cm distance, we are 0.1 cm off? That would work for the OSE sensor case. | *Does that imply that for 5 cm distance, we are 0.1 cm off? That would work for the OSE sensor case. | ||
=Calculations= | |||
Speed of sound is about 1100 ft/sec. Wavelength at at 400khz is | |||
=Links= | =Links= | ||
Revision as of 20:55, 1 March 2019
Industry Standards
- Common HC-SR04 1 cm accuracy sensor - Sparkfun - [1]. Claims 3 mm resolution, which would work for CNC torch.
- Migatron - [2]
- High precision - 1/20 of a % accurate, at 5-30". Only $2000! Not. [3]
- https://www.migatron.com/rps-400-6/ - 400kHz and 2.1 ms response time.
Arduino Simplicity
- Thread on the precision of the HC-SR04 sensor - [4]
- 2.5% is the general figure. so for 25 cm distance - get 0.6 cm off.
- Does that imply that for 5 cm distance, we are 0.1 cm off? That would work for the OSE sensor case.
Calculations
Speed of sound is about 1100 ft/sec. Wavelength at at 400khz is
Links
Inquiry to Migatron
- We are working on a CNC torch table for oxyfuel torching of heavy sheet metal. We need to detect distance of the cutting torch from the workpiece by measuring close to the cut line. This means a hot environment with possibility of smoke. Our accuracy of height measurement should be 1/16" (1-2 mm). Can you please suggest one of your products? What is the price?