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Questions tagged [calibration]

16 questions
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Is sensor measurement uncertainty the same with its calibrator?

I'm trying to calibrate a proximity sensor A with another proximity sensor B. Say sensor B uncertainty is already known from the data sheet. However, for sensor A the uncertainty is nowhere to be found. So I try to calibrate sensor A with the…
el-cheapo
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Rule of Tens/Ten to 1 Rule in Measurement and Inspection

I'm trying to clarify my understanding about the requirements [read: best practices] for measurement resolution and measurement confidence. The "Rule of 10s" is a commonly tossed around guideline for measurement resolution that, to the best of my…
Argonax
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Quantifying Instrument Precision Using Multiple Measurements: Rounding

I'm working with a spectrometer that collects raw data as a 16-bit integer value, so the readout I get from a measurement always varies between 0 and 65,535. I'm trying to avoid implementing data with false precision in subsequent analysis of the…
AggroCrag
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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. ) algorithm in their sensor values. For example : PT1 damping is used in ABS Sensor value to determine the speed. PT1…
user2986042
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Calibrating a system with matrices

I have several monochromatic LEDs that are coupled with controlers (PWM), thermometers and light sensors (spectrometer). For each LED: The controlers allow me to change the voltage/current applied to the LEDs, which, in turn, modulate the light's…
adrienlucca.net
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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 B is not calibrated. It may give a linear response to the light the same wavelength, but I don't know how linear the…
adrienlucca.net
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Emerging beam from PPLN waveguide not behaving well through optics

We have a pump laser beam that is coming out of a single mode fiber and butt coupled into a PPLN waveguide crystal. We are capturing the beam at the output of the crystal with the focusing lens in an attempt to collimate it into a beam. The emerging…
Bilal
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Referencing for Air Quality Monitoring

I asked the same question in electronics sub, but since it is more general I am asking it here again. I bought the Sharp dust sensor GP2Y1010AU0F. Below are the graph of readings indoor for ~5 minutes, it seemed quite smooth to me. The peak at the…
Ziya Keskin
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How can I calculate uncertainty based on measurements from multiple separate runs?

I am using standard test blocks to find the uncertainty of a supermicrometer, which is capable of measuring down to 1/10 of a micron. The issue is that it measures the EXACT same length within a run of even 100 measurements. Understandably, it is…
Gevorg Ter-Isahakyan
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Method for permanent adjustment of pitch and roll of a mounting plate

I have a 2D lidar mounted to a plate on a robot. I am looking for a method to adjust the pitch and roll of the plate so the plane of the laser is parallel to the ground. Currently, I am using thin metal shims, but I want to find an easier method…
Klik
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Thermistor - Steinhart-Hart Coefficients

In order to identify Steinhart-Hart coefficients for a thermistor, three known temperatures may be used to find three resistances. What is the best way to choose these temperatures to calibrate from? Is it more beneficial to use three…
K Sco
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Figuring out Geometry for Kreg 720

I'm making pocket holes to connect wood together with a jig, the Kreg 720. The 720 works by moving at an angle (which I'm trying to measure) to ensure the hole is drilled higher on thicker pieces. The jig makes a hole like this at a 15 degree…
bonhoffer
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Why not to calibrate accelerometer in IMU filters?

I have been reading various research papers regarding IMU filters and I came to the question of why do we not need to calibrate the accelerometer values as we do for the gyroscope and magnetometer?
Mr. E
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Why are FBG sensors recalibrated every 10 years?

So, I am working with FBG sensors and I have read that those sensors need to be re-calibrated every 10 years to get accurate measurements. But no where on the internet (AFAIK) is it explained why every 10 years it has to be re-calibrated and why.
LinkCoder
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Must MSA (Measurement System Analysis) be re-performed after annual instrument calibration?

I'm working in an automotive company that must follow IATF (International Automotive Task Force) requirements. I administrate a test-bench that performs RF (radio frequency) tests using an appropriate measure instrument. As IATF requires, the…
Andrea
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