# Questions tagged [distance-measurement]

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### Inline thickness measurement by optical transmission (Beer-Lambert law)

I am wondering how effective would be an inline system for thickness measurement of diffuse plastic samples based on light attenuation. Sample thickness woud be in the order of a few mm. I know that ...
• 103
38 views

### How to measure the rotation direction and speed of a ring on a finger?

I am trying to create a device that can measure the rotation of a ring on a finger. Basically there's going to be two rings on the finger, one that rotates and one that is stationary. The idea is that ...
• 3
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### Cost effective hand held medical scanner

I am currently doing a summer project where I am tasked with taking precise measurement of skin deformations, whether it be wounds or pimples, the measurement of the z-axis depth is what I am ...
71 views

### Sensor to measure distance with high precision

I am making a machine which, from the curve of the top of a violin, cuts the feet of a bridge. I thought that a sensor attached to a motorized rail could take precise measurements of the distance from ...
• 103
125 views

### Rotation of point in 3D space

I want to rotate a point (3,4,5) by an angle 45 degrees(0.785398 rad) in 3D space. I have used the standard DCM matrix in the order Rx, Ry and Rz. Where, $\theta = 0.785398 [rad]$  Rx= \begin{...
30 views

### Is there any small laser tracker optimized for small workspaces

A conventional laser tracker is usually large, but allows measuring up to a couple of meters away with great accuracy. However, if we are only interested to measure a target that is only a few ...
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### 3D displacement measurement of a small object with sub-micron accuracy

Say we have a small object for which we can choose its geometry and material (e.g, a spherical mirror with 5mm diameter). Or alternatively a point wise light source generating spherical waves. The ...
• 103
73 views

### How to calculate scaled speed

While working on a project I faced a difficult problem. Let's say I have car at a 1/10 scale. Now if a real car drives at 10 m/s, it would take 3 seconds to travel 30m. If we look at the scaled car ...
• 101
64 views

### Is it possible to estimate location of a source of light using single camera?

I wonder if it is possible to estimate location of a static source of the light using single camera? If possible how does it work in a nutshell? If not possible any work around like using multiple ...
169 views

### Can two microphones placed within centimeter distance together measure a distance of the sound source?

I have placed two microphones placed within 1 or 2 cm distance. They can receive and record sounds around them. I want to detect the distance of the sound source (specially human voice) and the ...
203 views

### How to take dimensions of an underground tank

We have a few underground tanks with only the manholes visible from the outside. All tanks are cubic-shaped. How can we accurately measure the dimensions (depth,length and width) of the tanks? Are ...
• 101
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### How do Time of Flight (ToF) cameras work

I have a question about Time of Flight (ToF) cameras. I understand how ToF cameras work with a single point but I can't understand how ToF cameras determinate from which point of scene do pulses from. ...
1 vote
1k views

### car steering to enter the parking lot [duplicate]

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 ...
1 vote
38 views

### 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 ...
• 385
1 vote
519 views

### 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, ...
• 113
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### Is it possible to set up an ultrasonic range-finding system using a separate transmitter and receiver across 30m distance?

I need to set up a system capable of detecting the distance between an object moving further away and an anchor point. This object would be traveling through a slightly curved tunnel (of 1m diameter), ...
1 vote
106 views

### 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 ...
9k views

### 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 ...
• 121
1 vote
147 views

### 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 ...
1 vote
143 views

### 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: ...
• 398
22 views

### What object characteristics may cause significant distance measurement deviations in Sharp optical sensors?

Not sure if this is the right place to ask this question, but anyways. I'm not very fond of circuits and stuff, but I've got a test question I really need to answer. The question is in the title, ...
• 119
1 vote
143 views

### 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). ...
• 11
28 views

### 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 ...
• 101
1 vote
97 views

### 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 ...
1 vote
64 views

### 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 ...
1 vote
2k views

### What is best sensor & method to measure human height?

My application needed to measure human height on a standing kiosk. I need to attach the sensor on kiosk ceiling type top. I used different kind of ultrasonic sensor for this purpose but nothing ...
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1 vote
125 views

### Stretching material accurately with a machine

I am currently making software to interact with a conductive rubber cord. I am very interested in figuring out the percentage of a stretch of the cord, to determine how the resistance changes. ...
• 121
1 vote
85 views

### Precision measurement of liquid level in a tank which is continuously opened and closed

I need to measure the level of the liquid in a tank. The tank is opened and closed frequently. Measurements are made in milliseconds. I tried to measure the level of the liquid by using an ultrasonic ...
• 11
150 views

### 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 ...
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1 vote
467 views

### How can I increase my ultrasonic sensor accuracy?

I am using a long ranged ultrasonic sensor to measure milk height in milk silos. Milk is stirring. Milk Silos Design: Shows two type of silos both are stirred in different direction
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1k views

### 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 ...
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1 vote
957 views

### 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 ...
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