Questions tagged [sensor]
The sensor tag has no usage guidance.
62
questions
0
votes
0answers
48 views
Frequency Domain Signal to Noise Ratio
I am doing some research on low-cost air pollution sensors. I'm measuring the "ground truth" with a single low-noise sensor, and I'm trying to use it to calibrate a low-cost sensor that has high noise....
0
votes
0answers
24 views
Coordinate frame in IMU/GPS Error-state kalman filtering
I just read this really nice paper "Quaternion kinematics for the error-state Kalman filter", according to this book "Principles-Multisensor-Integrated-Navigation-Applications" we have following ...
0
votes
1answer
23 views
Inverting Sensor Transfer Functions?
When you see software packages that read in data from sensing equipment, does the software do something to inverse the transfer function?
Correct me if I'm wrong in my understanding, but this is how ...
0
votes
1answer
64 views
Kalman Filter - How to combine data from sensors with different measurement rates?
I'm trying to implement a Kalman filter for tracking the position of a vehicle with the help of position data from GPS and Odometry measurements. The GPS data (WGS84 format collected from an app on an ...
0
votes
2answers
41 views
Minimum sample frequency of IMU accelerometer and gyroscope
I was wondering how I would justify a sampling rate of 125 Hz for accelerometer and gyroscope data from wearable sensors. This is a rate used in a lot of biomechanics literature, but I can't seem to ...
0
votes
0answers
13 views
What features can be extracted from accelerometer sensor used for Structural Health Monitoring (SHM)?
I am using dataset found online for SHM which uses accelerometer sensor to detect changes in the structure. I know that I can transform the time-domain data into a frequency-domain and into a time-...
1
vote
0answers
36 views
How to draw a smooth spectrum from a discrete array of measurements at selected frequencies?
I have a AS7265x triad spectroscopy sensor from SparkFun (link) which gives me measurements at 18 individual light wavelengths between 410nm and 940nm. The datasheet says that the FWHM of each sensor ...
0
votes
0answers
8 views
Combine correlating input signals to generate multiple output signals
Choosing a descriptive title was quite hard, as I am not sure how to describe my problem accurately.
I have a mechanical system fitted with several sensors (Strain Gauges and motion Sensors). There ...
0
votes
0answers
17 views
Can we draw Accelerometer and Gyro data on the same graph using Signal Vector Magnitude(SVM)or Euclidean distance?
I am a computer science student so do not have much electronics background. I am doing my final year project where I am collecting data from 3 axis accelerometer and gyroscope from android mobile via ...
0
votes
0answers
23 views
Determining position and g-forces from accelerometer and gyroscope data
I'm analyzing gyroscope + accelerometer data acquired from an IMU for a run of a water skiing slalom course, sampled at 100Hz.
The double spikes represent spurious ~15G jitter from crossing both ...
0
votes
0answers
19 views
Signal ECG , collecte & visualize data
I am currently working on a sensor that visualizes an ECG signal and visualizes its data. Its principle is that it has 3 electrodes that must be placed in specific parts of the body .... I would like ...
5
votes
1answer
479 views
What type of low-pass filter to use for gyroscope filtering in control application?
I am using a gyroscope to generate a feedback signal that drives a motor to resist rotation, just as in a camera gimbal.
The gyroscope is sampling at 32 KHz with a bandwidth of 8 KHz, and my control ...
0
votes
0answers
30 views
Is my Kalman Filter model reasonable? Using for a 3 wheels rover platform
Background: I'm building a 3 omniwheel rover platform that looks something like this:
It has 1 IMU sensors on each of the wheels (3 in total). So in theory, I can get gyroscope and accelerometer data ...
0
votes
1answer
98 views
Bias instability in Gyroscopes : AVER / ADEV
I am attempting to implement allan variance to determine the amount of bias that is shown in my IMU's gyroscope ( BMI160 ). I am doing this with the following formula, that was captured in the ...
3
votes
1answer
435 views
How to interpret Allan Deviation plot for gyroscope?
Regions with different slopes correspond to different types of noises in Allan Deviation plot of a steady gyroscope at steady temperature.
My doubts are:
What is significance of x axis in this plot, ...
1
vote
0answers
42 views
Rocketry : Combine two accelerometers to reduce noise?
I am designing an IMU for an experimental rocket. I'll be using the BN055 9DOF that has sensor fusion - orientation quaternion - and gravity compensation.
My main goal is speed computation, and I was ...
0
votes
1answer
73 views
Handling a number of simultaneous measurements in Extended Kalman Filter?
If I have a number of sensors whose measurements arrive at the same time - how can I handle them properly in the Kalman filter?
P.S.
The measurements are not necessarily taken at the same time but I ...
2
votes
3answers
203 views
Kalman Filter Sensor Processing
Kalman filter achieves convergence of state vector by using sensor observations.
Assuming a sensor such like velocity sensor, giving two axis velocity information in X-axis as well as Y-axis(see edit ...
1
vote
1answer
33 views
Is there a closed form solution for a temporal calibration of two different signals?
Given two signals $f_1(t),f_2(t+dt)$ where $t$ is time and $dt$ is the time delay between the two signals,
is there any closed-form solution with respect to $dt$?
what are the efficient global ...
3
votes
1answer
127 views
FFT of resultant of signals
If one has two signals (say, two acceleromters mounted perpendicularly) and a piece-wise resultant acceleration signal is determined, it appears that frequency content information cannot be determined ...
1
vote
1answer
89 views
Signal recovery from multiple noisy sensors
I'm working on detecting signals buried under the sensor noise using a multiple sensor system and using some technique (correlation?) to take what is common to all the sensors and cancel out the ...
2
votes
0answers
191 views
Software based synchronizing of multiple data streams/sensors with slightly differing sampling rates
Situation:
I try to synchronize the data streams of multiple sensors (ADXL372) of the same type but with different data output rates. The data sheet states all sensors should have the same sampling ...
1
vote
0answers
41 views
Interpretation of steady state sensor signal
I try to understand some measurement results of an accelerometer MEMS sensor. I used a mikrocontroller which is sampling an accelerometer's analog signal with the built in analog-digital-converter. ...
1
vote
0answers
46 views
Source localization in 3d
Let's say I have a 4-sensor square-shaped array in 3d space, with sensors at
$$ s_1 = [1 \ 0 \ 1] \\
s_2 = [2 \ 0 \ 1] \\
s_3 = [1 \ 0 \ 2] \\
s_4 = [2 \ 0 \ 2] \\ $$
And a single source somewhere ...
1
vote
3answers
493 views
Digital filter selection for sensor
I am having a LM35 sensor which gives $10\textrm{ mV}$ signal per degree rise of temperature. Now I have one question, which digital filter will be the best for this ?
This sensor will be use in very ...
0
votes
0answers
64 views
Digital filter: selection
I am going through digital filter design. But I really get confused with so many
Digital filters :
IIR
FIR
Moving Average
Linear phase filter
Allpass filter
Comb filter
Analog filter:
...
2
votes
2answers
187 views
Detecting pattern from signal data by gaussian mixture model?
I'm a machine learning newbie.
I have sensor data which is generated by several sensors.
The data is a series of 'time's. (it is not labeled, in other words, I cannot know which sensor generates ...
0
votes
1answer
5k views
What is sensor drift?
From Wikipedia:
If the output signal slowly changes independent of the measured property, this is defined as drift
So my question is, if I have a gyroscope with sensor drift does that mean that $E\...
1
vote
1answer
814 views
Filtering an acceleration signal
I have a triaxial accelerometer giving me acceleration along x, y, and z. I then combine the 3 axes by calculating magnitude of acceleration over all time points (details in my question here)
I'm ...
1
vote
1answer
1k views
Triaxial accelerometer to single signal
I have some smartphone recorded accelerometer data, so I have acceleration along 3 axes: $$a_{x}, a_{y}, a_{z}$$
The accelerometer data was collected by securing a phone to a walking subject. I'm ...
0
votes
1answer
76 views
Spectrum Sensing HW
I am interested to use an existing hardware to perform a spectrum sensing/monitoring in the frequency range of 2.2–2.6 GHz.
Taking into account that the 802.11ac channels are in the range of 2.4–2.5 ...
2
votes
0answers
150 views
Vibration signal analysis of non-stationary movement
my task is to develop a condition monitoring system of a machine module. For that I am using the vibration sensors placed on the machine housing. I want to focus on only one module of the machine, a ...
1
vote
1answer
293 views
Frequency measurement from acoustic emission sensor data(VDC RMS)
Currently, I am facing a problem about understanding FFT concept and getting exact frequency with acoustic emission sensor data(VDC RMS data).
I want to measure the sound frequency from the acoustic ...
0
votes
1answer
87 views
Techniques Used To Process Accelerometer Recordings [closed]
I'm currently working on a project which involves using Accelerometer data. Having searched the internet for techniques in processing the data, I am unable to find simple techniques. Is there any ...
2
votes
2answers
172 views
Why do we assume zero mean noise in sensor data?
I am reading a paper on measuring respiratory patterns from video data. In defining the model, the authors formulate the problem mathematically as:
$x_i(t)=h_i(t) \ast g(t) + n_i(t) $
Where $n_i(t)...
1
vote
1answer
2k views
Using Kalman Filter to fuse two sensor readings of the same type
I have always used Kalman Filter to smooth a signal comes from one sensor only.
I would like to know if Kalman Filter could be used to fuse data coming from two different sensors that provide the ...
1
vote
1answer
253 views
How to remove ADC-induced noise from voltage measurement data?
I am measuring the various voltages involved in a solar energy system, but the recorded values vary by quite a bit, most of which is caused by the ADC in the Arduino Nano I am using to take the ...
0
votes
1answer
325 views
Vibration Sensor - Balancing Machine
Im' working on a balancing machine. this machine has two vibration sensors. (pizzo) my question is about that why this machine use two Sensors? this machine has an rotary encoder to detect disk angle. ...
2
votes
0answers
34 views
How to determine load cell response to arbitrary temperature changes with known step response(s)
We have a loadcell, the output of which is (naturally) temperature dependent.
Under static load conditions, we have observed a dynamic response to temperature changes. Therefore, we did a step ...
2
votes
0answers
83 views
Obtaining n values from n-1 sensors
As the questions states, lets consider we have 3 gas sensors giving me data for:
A
B
C
Note that only sensors for A and B give absolute values, yet we need the absolute values for all four species:...
1
vote
0answers
217 views
How to convert magnetometer readings into orientation?
I have a magnetometer sensor, obtaining the reading with $50$Hz rate. Unfortunately, the data is not labeled: I just know that these are $x$,$y$,$z$ axes, and that the reading are in $\mu$T (micro ...
1
vote
0answers
123 views
Interpretation of minimum discernible signal (MDS) in sonar equation
I am working on modelling and simulations of synthetic aperture sonar at component/subsystem level. I have started with standard sonar equations for calculating detection ranges for different ...
2
votes
3answers
380 views
Why is my laser beam intensity profile not Gaussian?
I am kind of new to laser physics and signal processing, I hope I am in the right place to ask this question. I am also sorry for my not-great English.
I have been asked to study the transverse ...
2
votes
2answers
497 views
detect and distinguish driving maneuvers via smartphone sensors
I want to do some driving style analysis via smartphone.
Therefore, I programmed an app that records a 2D acceleration (when accelerating/braking and turning left/right). The app calibrates itself in ...
1
vote
1answer
1k views
Accelerometer - coordinate system transformation
I'm getting some accelerometer readings from an Android phone, but it comes in on the phone's coordinate system. I want to apply a transformation to put the acceleration in the world coordinate system ...
0
votes
2answers
345 views
Oversampled Binary Image Sensor vs Active Pixel Sensor(CMOS)
I am a beginner in the field of Image processing.I was designing a camera sensor when I came across these two type of sensors:
CMOS(Active Pixel Sensor)
Oversampled Binary Image Sensor.
Now, I can ...
1
vote
1answer
2k views
Choosing correct filter parameters for IMU sensor datas
I have a IMU sensor breakoutboard using ITG3701, LSM303D LinkProduct. This involves accelerometer, gyroscope and magnetometer. I have connected the sensors to a Arduino and sending the datas to ...
1
vote
1answer
91 views
Combination of accelation signals from two devices
I have $x_A$, $y_A$, and $z_A$ acceleration signals collected from a smartphone and I call it: set $A$ and I also have $x_B$, $y_B$, and $z_B$ same acceleration signals from smartwatch: let's call ...
3
votes
2answers
4k views
Detecting outliers/noise from sensor data
I am trying to detect outliers/noise as indicated on the diagram below from sensor data. Can anyone advice how to go about it? I can only do this in python, so are there libraries in python that I can ...
0
votes
2answers
403 views
How do I normalize accelerometer signals values to a relative scale?
Different smartphone devices have accelerometers manufactured by different manufacturers.
Say I want to categorize vibrations recieved from various devices into one of the following scales :
...
