Questions tagged [sensors]

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Non contact measurement of short distance with high accuracy

I am looking for a sensor that can measure the distance to skin. It should be able to handle dark and light skin without much difference to accuracy. The measurement range should be around 1cm to 5cm ...
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1 answer
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DIY linear position sensor IR switch - bad results

I have a test rig whereby a shaft (an M4 threaded bar) is being pulled ~11.5mm by a mechanism (rather not detail that) in about 20ms. I want to plot the movement of this shaft vs the mechanism pulling ...
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How do I know if I can cut pressure sensors into different shapes?

I am building an imaging platform that requires the application of two pressure sensors shaped into a "hollow" semi-circle, pretty much C-shaped. To do this, I thought of buying the ...
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1 answer
33 views

Understanding data received from sensor (Twos complement)

So I use accelerometer to get acceleration data. However, I have trouble understanding data. I have been reading manual, but it does not help me: ...
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33 views

Inaccurate flow rate measurements of an engine diesel fuel due to change of its viscosity

I am measuring the volumetric flow rate of a diesel fuel using "Turbines" flow meter, both in the supply and return fuel lines of an industrial diesel engine (Caterpillar 3512B – coupled ...
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2 answers
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Need a solar powered mechanical motor? that moves a leaver up and down low force and little distance on day/night

I'm planning to use barrels full of water to make a drip watering system. I can make the water controls from a pretty easy toilet fill&flush valves and balance it so it needs a very light push on ...
1 vote
1 answer
43 views

Applications of CO$_2$ sensors [closed]

I am working on a project where I am creating a new type of CO2 sensor. (I can't give details on the functionalities). I am looking for applications to showcase the capabilities and the usefulness of ...
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1 answer
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how would I identify when and who enter through a doorway, assuming they can have part of the technology on their person

I am working on setting up a system that senses when an object goes though a door. I've seen things using lasers or induction. I have a set of objects smaller than 1 square inch. I just want to know ...
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1 answer
326 views

Calculate Vibration Velocity and Acceleration from Triple Axis Accelerometer

Looking for very specific support developing a simple Python script to take the time series X,y,z tuple readings from a triple axis accelerometer and output a meaningful measure of vibration for ...
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2 answers
44 views

Measuring angled surfaces with a lidar

I have been trying to create a sensor that detects when a golf club hits a golf ball. My idea was to have a lidar sensor to continuously poll the head of the golf club, and return a positive ...
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Using an NIST Calibrated Thermistor Meter with uncalibrated or unknown probes

Background: I recently purchased a NIST calibrated thermistor meter for measuring temperature at work. This Digisense (20250-94) meter came from a seemingly reputable company, Cole Parmer, and we ...
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17 views

What camera specs should I look at for smart vision applications?

Currently I'm looking for a camera to work as a 360-degree view of a vehicle but also be used for smart applications, specifically I'm trying to identify certain objects. The 360-degree systems I've ...
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How long is the loss of video in IR cameras due to calibration?

I am reading a paper that mention the advantages of shutterless algorithm in IR cameras. As I understand, without it, in order to perform a Non Uniformity Correction the sensor, a mechanical shutter ...
1 vote
1 answer
73 views

DIY CO2 sensor calibration

Summary: Are there any worthwhile methods for rough calibration of CO2 sensors without proper chemistry lab equipment, calibration gas, or other known-good sensor available? It would only be used as ...
2 votes
0 answers
44 views

How do you generate an impulse signal in a mechatronic system?

Background: I have a piezoelectric force transducer that I am using to measure the force produced by a combustion reaction in a tube. The issue is that there is a lot of ringing that occurs during the ...
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1 vote
1 answer
80 views

How to find out the sampling rate of an acceleration sensor?

In the sensor catalogs, I cannot find this field. They only depict the frequency response range. For example, Bently Nevada's sensors. How we can find out their maximum sampling rate?
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What type of sensor do you think is best for use in liquids? [closed]

I am looking for a level controller that's going to be used in an industrial setting. My main concerns are high level of precision and low total error band. Do you have any recommendations? Both types ...
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1 answer
30 views

Question related to pyroelectric sensor

Is it possible to detect human motion by using a single pyroelectric sensor? According to me we can't do so using a single sensor.
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1 answer
177 views

Obtain velocity by using accelerometer data

I have an accelerometer sensor, which obviously measures acceleration along the $x$, $y,$ and $z$ axes.What I would like to do is to obtain the velocity along these axes by using the accelerometer ...
1 vote
0 answers
66 views

Why we are using PT1 Damping in automobile Sensor values?

I got to know that most of the automobile manufactures are using PT1 Damping (concept like raising Linear/ PT1 failing time etc. ...
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1 answer
56 views

Homemade metal cover for Arduino temperature sensor

I have one ds18b20 temperature sensor for this project, but I don't have the metal cover for it like shown below: So if possible I asked here to have your intelligence for finding some homemade ...
4 votes
1 answer
480 views

Alternatives to laser line?

I'm trying to project a very thin line at a low angle over some surface defects (peaks and troughs). The scale is ~20mm square, but the defects can be sub-mm (0.2 - 1.0mm). I am currently using a line ...
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5 votes
1 answer
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Is there a way to estimate whether the driver or co-driver picks up the smartphone?

First of all, as I am new in this very corner of stack exchange please help me by selecting the correct tags! I'm interested in finding an alorithm, that estimates wether a phone is picked up from the ...
1 vote
4 answers
137 views

Calibrate a sensor using another, already calibrated sensor

I have two light sensors. Sensor A is factory-calibrated and gives a linear response to the light at a certain wavelength. Sensor ...
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26 views

motion tracking (or position tracking) with tilting

I'm looking for a sensor or a tool for tracking motion on a surface similar to Ultrasound probe, for a relatively small movement, about less than 30cm, and it needs to be able to tilt. standard ...
1 vote
0 answers
29 views

Finding force distribution using accelerometer data

The team I'm currently working for is trying to compare bushings with different durometer ratings in the front suspension using single axis(z) accelerometer data during curb impacts. The current ...
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48 views

Detecting goals blocked on a foosball table

I am trying to find a way to detect when a goal is blocked on a foosball/kicker table. I have a HD camera above the table and a laser sensor built into each goal. The lasers can detect when a goal is ...
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87 views

What is the feedback signal used in the speed control of a brushless DC motor?

In a brush-less DC (BLDC) motor the commonly used speed is sensed using the feedback from Hall effect sensors and the back or counter EMF. The linked article on Wikipedia also mentions that 'Other ...
2 votes
2 answers
74 views

Measuring distance to a non perpendicular surface

I am a Mechanical engineering student and i am completely new to arduino and need some advice. i have a project to measure the maximum deflection in a sailplane wing (up to 9 meters) How do i measure ...
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2 answers
71 views

Are cameras' CCDs just elaborate tiny solar cells?

While watching How It's Made episode on CCDs, this just springed to my mind... I always though of CCDs as of some kind of alien technology. Only now I realized that it's just an array of silica ...
2 votes
2 answers
91 views

How can one make the beam angle smaller on an ultrasonic sensor?

I'm trying to create higher resolution data with a beam angle of 5> degrees (as close as 1 degree as possible). I have been experimenting with creating using an aluminum casing around the sensor ...
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1 vote
1 answer
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Passive Infrared Sensors (PIR) spectrum and reflections

I have a common PIR occupancy sensor (Lutron MS-OPS5M-WH). I am trying to get the sensor to cover an irregular-shaped room. I could expand the field-of-view of the sensor to cover the whole room by ...
1 vote
1 answer
22 views

Sensor compatibility with power source

I have a sensor whose datasheet mentions that it should be connected to 5V Vcc. A green LED glows on the sensor when it is powered from the source at 5V. However, even if I power it with 3.3V, still ...
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1 answer
40 views

Complementary filter in MPU_6050 is giving me the wrong answer when the system is accelerating

So I am using a complementary filter to find the attitude in my quadcopter, doing the following $$\text{angle} = 0.98\cdot (\text{angle}+\text{dt}\cdot \text{angle_rate})+0.02\cdot \text{...
1 vote
2 answers
708 views

How is the YAW angle calculated by an IMU sensor?

Say a body rotates by 90 degrees, then the yaw angle will be 90 which can be calculated using the data provided by IMU. Now from that point, the body traverses some distance and is again rotated by 90 ...
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1 answer
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Do LiDAR sensors generate point cloud data from a single collection or build them up over multiple collections?

I am currently writing a background section on lidar sensing for part of my dissertation. I have either confused myself or not thought on the topic enough and I am attempting to gain a clearer ...
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How to sanitarily measure vacuum in milk?

I would like to measure the vacuum inside of a tube which will contain air and milk. A vacuum pump attached to the tube will maintain a vacuum of around 15 inHg. Are there inexpensive sensors I can ...
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How does the number of cycles for averaging in a lock-in amplifier relate to low-pass filtering and where do I set it?

Please forgive me if I ask too many questions at once or I am too much of a rookie. I want to understand the working-principle of lock-in amplifiers (LIAs). I understood the calculation that yields ...
1 vote
1 answer
80 views

Ceramic pressure measurement - piezoelectrical or capacitive?

Context: I'm writing about an old industrial training facility used for a petrochemical process. In this training facility, there is a 3-phase separator. On that separator is a pressure measurement. ...
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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), ...
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1 vote
1 answer
140 views

Can I use loadcell for vibrating force measurement?

Is it possible to use a load cell to measure a force that is vibrating? The idea is to measure that force that is getting into the load cell in a sweep of frequencies and vibration is NOT a noise. ...
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1 answer
33 views

Orientation of wire in linear position wire sensors

Talking about a wire potentiometer, I was wondering about the way it could be used after installation. as you know, wire sensors have a roll of wire inside them that come out of a hole, and it sounds ...
-1 votes
1 answer
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Schematic of a resettable thermostat

You can put 2 or 4 or even 6 pcs of this in series to make sure at least one will work or open if it reaches say 55 degree celsius, right? And there is no resistances to consider when its close and in ...
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3 votes
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allan-variance noise terms of MEMS accelerometer

Specific noise terms are given in datasheets of MEMS sensors. In example the specification of accelerometer contains information about random walk and in some cases the bias instability. Both ...
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34 views

Low accuracy current feedback measurement in motor control

Given a very low accuracy current sensor in a 3 phase inverter (in my case used for motor control) what is the best way to tackle the issue and keep reasonable performance and robustness at the same ...
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4 votes
1 answer
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Is there an industry consensus standard for storing sensor data?

I would like to know what standard(s) may exist for formatting log data from sensors that record information such as: temperature pressure humidity vibration acceleration vector magnetic field vector ...
2 votes
0 answers
336 views

What is meant by "accuracy within factor of 2" in sensors?

I've spent quite some time googling the meaning of "factor of (number)" in sensor accuracy but could not find any document explaining the meaning of this expression used to describe sensor accuracy. ...
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2 answers
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How do fiber optic sensors detect strains in a structure?

I am working on a project on detecting damage in structures using fiber optic sensors. I read the paper Structural Health Monitoring in Composite Structures by Fiber-Optic Sensors and found out that ...
3 votes
2 answers
55 views

H2 Sensor in N2 environment

We develop a test station where we might have H2 leakage. To prevent explosion we are considering intertisation using N2 gas (primary explosion protection). However we also want to detect leakage ...
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2 answers
147 views

Need help with reverse engineering a sensor

I have a pressure/temperature sensor for a vehicle, which I decided to tear apart to see exactly how the sensor works. This sensor as designed by the manufacturer it is meant to be immersed in oil to ...
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