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Engineering Stack Exchange

Questions tagged [distance-measurement]

28 questions
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Measuring the distance to an object with RF resonance

Assume I put an RF antenna in front of an object (typically the face of someone sitting in a chair, so able to move about +/- 10cm in all directions) at a typical distance of 1m. If I consider the system antenna/face as a resonant cavity, I'd get a…
Julien
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Could a medical ultrasound device be used for recording the topography of a small river?

I work as a research assistant in the field of water resources management. We build small scale physical models of rivers and make experiments with sediment. The model rivers are about 20m long and 3m wide, the water depth is from 0 to half a meter.…
Mathias
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M# Screw mm per turn?

So is there a standard rule of thumb, or equation about the distance the end of a screw will travel per rotation? Conversely, how many turns it will take to travel a specific distance? Say I have an M3 screw and I want to make absolutely no more…
Bob R
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Maintaining constant speed of a CVT engine during a slope

I am not sure if this question is related to this community. But nevertheless. I work on CVT engines, I had a new idea of modifying my controller during a slope or a gradient on the road so that the Vehicle speed does not take a hit. I have a radar…
user5603723
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How to measure height of water

I am trying to measure the height [level] of the water in a box that goes from -3°C (saltwater) with water and 150°C dry. Objects will be placed inside the box but will not take up the whole area. I need a sensor that is robust enough to go through…
Yelk11
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Short range distance estimation systems

Is there any emitter/receiver (passive or active) systems that allow distance estimation in the range of 1~2 meters with an accuracy of few centimetres and don't need to have a direct line of sight as optical systems mostly do? I was thinking about…
Mehdi
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car steering to enter the parking lot

I would like to understand if a "typical" car could be able to turn in this space at the entrance to the underground garage. How can I set up my calculation? I have a 2.5 meter mouth at the entrance as shown in the figure. Thank you for support
Fedele Nacucchi
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Help on IR Proximity Sensor Inaccuracy

I want to measure the depth of a burning soil using IR proximity sensor. The sensor will be placed 20cm above the surface of the soil and measures it perpendicularly. Problem #1: I'm quite concerned about the environment that the sensor is in, it…
el-cheapo
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object following using pid

in short, I want to implement a PID controller that takes in distance and returns velocity. Details: I am simulating robots following each other. I wish to maintain a constant distance, d between these robots. I can obtain the distance between the…
guthik
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Using complementary filter in rotation matrix

I am using accelerometer and gyroscope and try to compensate earth gravity. I figured out use of complementary filter, that calculates pitch and roll angle. On account of compensating gravity I am transforming the local acceleration in global world…
annemeler
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Measuring a pattern size on a flat surface

I want to manually measure the dimension of a pattern printed on a flat surface, with an accuracy of about 0.1mm. For simplicity sake, let's say this is a black rectangle, printed on a white background, and i want to measure its width and height.…
Adrien Descamps
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US customary units below 1 mil/thou?

I have been asked to provide some of our technical docs in both metric and US units. For the most part, that is easy enough: approx 1cm → approx 1/2" 500μm → 0.02" But then I start getting stuck: 50μm → 0.002" or 2 thou or 2 mils? Is there a…
Jack B
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Distance travelled at articulation point of turning vehicle

Problem outline: I'm trying to figure out the distance travelled at the articulation point of a turning vehicle with 4 driven wheels (each wheel houses a motor and can all rotate at different RPMs). If this isn't a suitable place for such a…
ReyL
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Mechanism timed by wheel rotations

I hope this is not off-topic. I’m wondering if someone could please provide some examples of a basic mechanism (I’m thinking something like a bevel/spiral gear, but open to anything) that is attached somewhere to a vehicle, and uses the rotation of…
J.Con
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Measuring intensity of a radio wave reflected from a metal plate

I am building a Project that can pinpoint location of a pen or any object (something as small as 0.5 mm radius sphere) placed on a flat screen. I am using a ultrasound sensor (initially but i can switch to a different sensor if the situation…
user177195
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