Questions tagged [sensors]

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2answers
862 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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1answer
147 views

What is the meaning of a “trip angle” in a level sensor?

What does trip angle mean in the context of slope / level sensors / inclinometers?
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1answer
149 views

From strain to displacement in 3d

I got a question thats been bugging me for a while: Say that you're given a straight square beam (say one meter long), and you attach three strain gauges on each face. One at 0 degrees, one at 45 ...
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0answers
118 views

Schematic Reading - Fluid Control Limit Switch Question

Does limit switch LS1 remain pressed on until the piston moves to LS2?
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1answer
1k views

Fan Sensors (Tachometer vs Locked Rotor)

With regard to Fan Sensors, there are two very common methods for detecting whether the fan is doing what it's supposed to or not. Locked Rotor- Detects when the fan is working, or when it has ...
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1answer
193 views

Pressure sensors with best precision

Measuring pressures have many different applications which require proper encapsulating of the sensors, but at the core there is a limited amount of techniques. To my understanding, the two leading ...
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1answer
173 views

Can a load be estimated using a Kalman filter?

I have a system with a motor, some masses, damping and springs. One of the masses is loaded with an unknown external force F. I want to estimate the force F using data of the motor (mainly current). ...
3
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1answer
292 views

How does the glass layer transfer the touch to the touch sensitive layer on Galaxy phones?

I have a Galaxy Note2 with a front glass layer that is broken, while the screen itself is ok, as well as the touch panel. If I understand properly, the front glass has only a protective function and ...
4
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4answers
742 views

Precision measurement of liquid levels

How can I measure changes in liquid level of the order of 50 μm? The tank is cylindrical with a radius of about 12.5 mm and a total volume of about 45 ml. The fluid is water-based. The technique ...
4
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1answer
490 views

Tracking location and direction without GPS?

How can I track a device's location (x,y,z coordinates) as well as the direction the device is facing (north, south, up, down, etc.)? Standard accelerometers are not precise enough for very small ...
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1answer
176 views

What is meant by the terms “low pass sensor” and “band pass sensor” in a course syllabus?

I am doing B.E. in Mechatronics Engineering. I am due to take a subject called 'Sensors and instrumentation'. So far I only have the syllabus for the course. I decided to do some reading in advance of ...
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1answer
169 views

IR sensor with carbon fibre

Is it possible to use an IR sensor to differentiate accurately between carbon fiber and a human hand kept on the carbon fiber surface? I would like to move the sensor from one end of the carbon fiber ...
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3answers
132 views

Help with closed loop heat controller (for a non engineer)

I am interested in setting up a controller which can modulate the output of 2 hotpads based on input from an infrared thermometer. The hotpads have their own dials, but I am considering controlling ...
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3answers
84k views

Calculating pitch, yaw, and roll from mag, acc, and gyro data

I have an Arduino board with a 9 degree of freedom sensor, from which I must determine the pitch, yaw, and roll of the board. Here is an example of one set of data from the 9-DOF sensor: ...
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0answers
157 views

How to tune the radial mode vibration of a PZT disc transducer?

I am trying to create a set-up where I can radially vibrate a 1x1 cm sample using a piezoelectric disc transducer. I know that at the $f_{min}$ of a PZT transducer, for the disc geometry, there is a ...
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2answers
116 views

How fast can a VEX robotics light sensor operate?

In my engineering class we must make a machine that can sort 15 marbles with 3 different types in less than 2 minutes. I plan on having one marble go over/under a light sensor with a flashlight on the ...
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5answers
2k views

Low cost, moderately accurate water depth measurement

tl;dr: After an extended conversation with an old-timer, I realized a few things: The single most valuable measurement for the majority of people will be water-depth-in-well. The second most valuable ...
14
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3answers
5k views

Can I use a ultrasound sensor to measure water level?

If I use an ultrasonic sensor will it detect the water level? I was thinking about a product to read water level on water boxes (common in Brazil). I researched about instrumentation for this ...
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1answer
420 views

What kind of motion information can be extracted from 3-axis accelerometer and 3-axis gyroscope sensor data

I have 3-axis accelerometer and 3-axis gyroscope sensor data coming from my bike trip. Until now I have extracted only basic information like overspeeding, hard acceleration and sudden turns. What ...
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6answers
12k views

Distance sensors with accuracy of 1 mm?

I am making a device for measurements. I would like to measure the distance within accuracy of 1 mm. Range could be 2 cm to 15 cm . I looked at Proximity Sensors but the readings displayed by these ...
9
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1answer
296 views

Sensors / processing algorithms to emulate a human's sense of smell

A lot of research has been devoted to creating electrical devices that emulate biological sensors, including: Visual: Cameras, color/light intensity sensors Auditory: Microphones, ultrasonic sensors ...
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1answer
194 views

Px26-015 pressure sensors output

I had a PC Mountable Wet/Wet Differential Pressure Sensor I used it to measure a pressure difference , I don't know how to convert its output to pressure !
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1answer
1k views

Which part of an aircraft can most benefit from a structural health monitoring (SHM) system?

In order to reduce operational cost and improve the safety and reliability of aircraft's the aerospace industry and government is increasingly evaluating new ideas such structural heath monitoring ...
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2answers
1k views

Is the reliability of automotive sensor technology impeding the success of self driving car?

The reality is that sci-fi KITT is almost here. Recently I read articles Delphi car driving itself across the country as well as Tesla cars will be self-driving this summer. As of 2013 four states (...
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1answer
160 views

What is a good sensing element to monitor corrosion in a bridge structural health monitoring system?

The question relating to measuring structural integrity of bridges brought awareness to six categories of structural health monitoring of bridges. They are Bridge foundations Concrete ...
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3answers
1k views

Can the structural integrity of bridges be measured in real-time for safety?

As a follow up to this question, I wonder if structural integrity monitoring information can be provided real-time and to a sufficient degree that safety decisions can realistically be made from the ...
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3answers
8k views

What is Radial and Thickness Mode Vibration in a Piezo Electric Ceramic Disc Transducer?

I am trying to use a Piezo Electric Ceramic Disc Transducer for ultrasonic sensing measurements for fluid levels. A Piezo Ceramic Disc with a Resonant frequency of 215 KHz or 1 MHz is under ...
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10answers
6k views

How to quantify martial arts strikes?

Subtitled: Ah, strong am I with the Force, but how do I measure it? With all due apologies for paraphrasing Yoda, I am trying to measure a force. Fortunately, it's an easier force to measure than ...
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1answer
667 views

How do ultrasonic proximity sensors detect motorcycles differently from cars and trucks?

My car has ultrasonic proximity sensors to help me park. I've noticed that when motorcycles whiz past me the proximity alarm goes off. I originally thought that the motorcycles were just too close, ...
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2answers
153 views

How to sense displacement without using any camera?

I am working on a hand-held prototype model in which I need to fix motor RPM below a certain displacement. For example, if overall displacement is within 5 mm then the motor should be running at a ...
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1answer
358 views

What type of sensing element is used in Water Quality Monitoring Meters?

What type of sensing element is used in Water Quality Monitoring meters such as those pictured below? I might not be using the correct search terms. Some of these meters monitor Total Dissolved ...
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5answers
765 views

How can I measure the thickness of a sedimentation layer in a closed tank?

Biogas slurry often contains sand and grit and organic matter that eventually sediments. Clearing thetank from sedimentation is expensive (plant downtime, additional equipment) and dangerous. So it ...

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