Ophir Photonics Group at SPIE Photonics West 2016 announced the RM9-PD Radiometer, a sensor for measuring the power of very low level CW or quasi CW sources. The RM9-PD integrates a photodiode sensor and an 18Hz chopper into an easy-to-use system that measures very low powers.
The sensor is calibrated over the entire range of wavelengths, from 0.2µm to 1.1µm, not just a single wavelength. The sensor features a digitally synthesised lock-in amplifier that reduces external noise to a minimum; this allows the sensor to measure power levels from 300fW to 300nW. The output of the sensor can be displayed on any standard Ophir meter or on a PC or Android smartphone or tablet.
Designed for detecting very low power radiation, the RM9-PD Radiometer features an 8mm aperture and fast response time (3.6s with display).
To display measurements, the RM9-PD Radiometer can connect directly to any standard Ophir meter or PC interface. This means no additional power module is required, as is the case with traditional radiometers. The RM9-PD works with Ophir's StarLite, Nova II, and Vega smart displays, and Juno PC interface. The sensor also works with the StarViewer app that brings laser power/energy measurements to Android smartphones and tablets. The display is automatically configured and calibrated when plugged into one of the company's laser measurement heads.