Questions tagged [sensor]
The sensor tag has no usage guidance.
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16 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
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1answer
127 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 ...
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0answers
25 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
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1answer
29 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
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1answer
95 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, ...
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0answers
35 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
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1answer
45 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 ...
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3answers
178 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
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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
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1answer
106 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
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1answer
75 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 ...
3
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0answers
150 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 ...
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0answers
37 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. ...
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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 ...
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3answers
394 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 ...
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0answers
53 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
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2answers
155 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 ...
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1answer
4k 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
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1answer
620 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
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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
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1answer
74 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
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0answers
124 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
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1answer
264 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
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1answer
86 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 ...
3
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2answers
157 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
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1answer
1k 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
167 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
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1answer
271 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. ...
3
votes
0answers
32 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
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0answers
81 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
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0answers
192 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
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0answers
109 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
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3answers
300 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
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2answers
428 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
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1answer
916 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
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2answers
293 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 ...
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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
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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
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2answers
3k 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 ...
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0answers
69 views
Phone accelerometer orientation
I have an app that retrieves the XYZ acceleration from the accelerometer. This works fine if the phone is oriented correctly with respect to the axis, but the interpretation of these values changes if ...
0
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2answers
352 views
How do I normalize accelerometer signals values to an 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 :
...
2
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0answers
113 views
Open source GPS+IMU sensor fusion?
Are there any Open source implementations of GPS+IMU sensor fusion (loosely coupled; i.e. using GPS module output and 9 degree of freedom IMU sensors)? -- kalman filtering based or otherwise
I see a ...
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2answers
317 views
Multiple cheap IMUs vs one expensive IMUs
In my project, there is a possibility of either buying one expensive IMU or 5 cheaper IMUs. They have to be cheaper due to budget limitations, and the idea is to use them in order to be able to do "...
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0answers
156 views
sensor fusion on GPS/IMU
can anyone gives any link or explained to me on how sensor fusion works on GPS/IMU. as of now, i have gain learn few of the algorithms on Kalman Filter. Currently, im using an arduino Uno as my data ...
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0answers
88 views
Sensor Data Fusion with Orientation Sensors in 3D Euclidian Space
Preconditions
For measuring the position of a mobile device in 3D space, I utilize two sensors with different characteristics that measure device orientation.
Sensor A (a combined sensor of ...
5
votes
1answer
347 views
Finding dependence between two sparse signals
I am new to signal processing and would really appreciate your help. happy to provide more context/details.
In my research, I have a system that has many sensors $X_1, \ldots, X_N$ and using this ...
2
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0answers
819 views
Analyzing accelerometer data: appropriate use of rotation matrices?
I'm working on a project in which a rod is attached at one end to a rotating shaft. So, as the shaft rotates from 0 to ~100 degrees back-and-forth (in the xy plane), so does the rod. I mounted a 3-...
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1answer
71 views
What type of sensors have complex Gaussian noise?
What type of sensors have complex Gaussian noise?
Do strain gauges also exhibit such noise?
2
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2answers
1k views
Measuring walking speed with iPhone accelerometer
As part of a research project, I have been tasked with determining gait speed (walking speed) for a subject using a handheld iPhone. The main constraint is that walking distances are very short (10-30 ...
2
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0answers
7k views
Horizontal banding (flickering) due to electronic rolling shutters
It is a well-known artifact that in CMOS cameras with electronic rolling shutter, horizontal banding (flickering), i.e. brightness intensity variations, are observed when the image is recorded under ...
