Overview of PD300 general purpose photodiode laser measurement sensor:

The PD300 is a general purpose photodiode laser measurement sensor with swivel mount and a removable filter and has a 10x10mm aperture. Without filter, its spectral range is 350 - 1100nm and its power measuring range is 500pW - 30mW. With filter the spectral range is 430nm - 1100nm and the power range is 2µW - 300mW. It has the exclusive Ophir automatic background subtraction feature. The sensor comes with a 1.5 meter cable for connecting to a meter or PC interface.

PD300 Product drawings:

Main parameters：

Problem summary:

What does the PD300 "Background Subtraction" do？

Ophir's photodiode PD300 and PD300-1W sensors provide automatic background subtraction, so the measurement is not sensitive to indoor light. By "filtering out" (i.e. removing the external filter for low light measurement), 2 independent detector elements can be seen. The light beam to be measured is only incident to the outside of the two detectors, but the background light reaches the two detectors. The instrument will display the power measured by the external detector minus the power measured by the internal detector. This patented method can offset 95% - 98% of the background light under normal indoor conditions, even if the background light is constantly changing.

Whether the missing PD300 filter can be replaced？

Technically, it can be replaced, but it is not just a matter of replacing the filter. Since the PD300 is a "calibrated" sensor, it requires that the filter also be "calibrated". In particular, since the PD300 response varies with wavelength, it is necessary to calibrate the PD300 and filters over the entire spectral range using a monochromator.

Whether the PD300 sensor can be used in the hot chamber where the temperature cycle exceeds the recommended operating temperature range？

Yes, but it should be noted that: The wavelength is not close to the long wavelength limit of PD300, which is temperature dependent; There is no condensation interference beam in the detector window to affect the reading.