Questions tagged [sensor]
The sensor tag has no usage guidance.
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What is a simple model of telescope sensitivity?
I am looking for a simple model of how sensitive a telescope is to low numbers of incoming photons. A train of individual photons hit one pixel of a detector, and I want to know what the numeric ...
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Why is my pyrgeometer calibrated as if it has $a >1$ emissivity?
I've acquired an SL-510-SS upward-looking pyrgeometer.
In the manual it gives the formula for how to compute the downwelling infrared it picks up:
Clearly the $k_2$ coefficient is the emissivity of ...
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Pressure sensors vs. piezoelectric sensors
In simple terms, what is the difference between pressure sensors and piezoelectric sensors?
I did some google search online and could not come to a good conclusion.
Say you make a 'sensor' in the lab ...
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If we know forces and torques applied to one point of a rigid body, how do we calculate them for another point of a rigid body
Suppose we have a rigid body with known length $r$ that is fixed at point $A$.
We also have a force-torque sensor at point $A$.
The body is fixed such that it doesn't move.
We apply forces to point $B$...
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How does an airflow sensor work? [closed]
There are 4 piezoresistive sensors placed at A, B, C and D.
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Working principle of Shack-Hartmann Wavefront Sensor
(Image source: https://www.thorlabs.de/newgrouppage9.cfm?objectgroup_id=5287)
In the Shack-Hartmann wavefront sensor, the local slope of the incident beam's wavefront is measured as a displacement of ...
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Weird EMF tester readings?
I bought a Digital EMF Tester Electric and Magnetic Field Radiation Detector here.
At first, I thought it was a metal detector since keyboards (without being inserted into a USB port) cause alarm, ...
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Deriving Azimuth Algorithm: Limitations of Accelerometer and Gyro Sensor Setup
I have a navigation device for which I am trying to derive an azimuth algorithm. I am getting stuck with the derivation, as I'm pretty sure it is impossible given the hardware I have access to. I'm ...
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Help with estimating odometry using two lidar sensors with known extrinsic calibration
I have a setup consisting of two lidar sensors with a known extrinsic calibration. Both lidars have messages with the same timestamps (no timedelay between them). My goal is to estimate odometry using ...
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Is photon emission density is same or random everytime?
I want to know if photon density changes over time. By density, I mean number of photon hitting a surface in time. I am not asking about the direction of emission which is random. What I mean is that ...
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Calibrating an inertial measurement unit (IMU) to zero/flat surface
I am building a digital spirit level using an inertial measurement unit (IMU), and I want to calibrate the device so that it shows the angle correctly. Does anybody here have experience with this kind ...
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Question regarding converting analog sensor value into mA [closed]
I'm doing a project with an absolute humidity sensor.
When I bought an absolute humidity sensor and implemented it into a machine, I expected the output value to be representative of absolute humidity,...
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Remote mass detection and location
Could a collection of gravitational sensors (eg. MEMS accelerometers), placed in a 3d grid (eg. 10 x 10 x 10 sensors forming a 1 x 1 x 1 m cube) detect the the presence and position of a remote mass ...
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Can the receiver of an IR sensor pick up the signal from another IR sensor?
So I was trying to find a way to transmit a particular signal.
I was thinking of getting one IR sensor to transmit a signal, which would be picked up by the receiver of another IR sensor. However, as ...
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