Ophir provides two types of power sensors: Photodiode sensors and Thermal sensors. Photodiode sensors are used for low powers from femtowatts up to hundreds of milliwatts and as high as 3W. Thermal sensors are for use from fractions of a microwatt up to tens of thousands of watts. Thermal sensors can also measure single shot energy at pulse rates not exceeding one pulse every ~5s.
Thermal sensors have a series of bimetallic junctions called a thermopile. Radial or axial heat flow through the sensor creates a voltage proportional to the power absorbed as it flows through the thermopile. The reading is not dependent on the ambient temperature since only the temperature difference is measured and not the absolute temperature. The thermopile elements are so arranged that the reading is almost independent of beam size and position. Generally, Ophir specifies ±2% or better uniformity of reading over the surface.Show Products >