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Alvium USB Cameras User Guide V3.6.4
Specifications
Notes on specifications
This section defines the conditions for specifications stated in this chapter.
Sensor
Absolute QE plots
Measurements for color cameras were done with IR cut filter, measurements for
monochrome and S-Mount cameras were done without optical filters. With optical
filters, QE decreases by approximately 10 percent. The uncertainty in
measurement of the QE values is ±10 percent. This is mainly due to uncertainties in
the measuring apparatus itself (such as Ulbricht sphere and optometer).
Manufacturing tolerance of the sensor increases overall uncertainty.
ON Semiconductor sensors
The curve in the absolute QE plots shown in this chapter is from the sensor
manufacturer data sheet. The information was correct at the time of publishing.
Sony sensors
Sony provides relative response curves in their sensor data sheets. To create the
absolute QE plots shown in this chapter, the relative response was converted to a
normalized QE response and then adjusted as per three measured QE values
(at 448 nm, 529 nm, 632 nm) for color sensors and one measured QE value
(at 529 nm) for monochrome sensors.
Wavelength
The wavelength range in the absolute QE plots reflects the information available in
the sensor manufacturer data sheet at the time of publishing. For additional
wavelength information, contact the sensor manufacturer.
Spectral response plots
The curves in the spectral response plots shown in this chapter were calculated
from measured quantum efficiencies at 448 nm, 529 nm, and 632 nm. The shape
of the curve is taken from the sensor data sheet but the values have been adjusted
based on these measured values. The uncertainty in measurement of the spectral
response values is ±10 percent.
