Electronics Weekly
Named QPD-385-Y, the sensor’s dark current is typically 5nA per element (140V bias, 30nA max) with a temperature coefficient of 1.11x/°C.
Illuminated with 1.064μm wavelength light, at the same 140V bias typical sensitivity is 640mA/W (500mA/W minimum).
Capacitance is typically 22pF per element (16pF min) and rise-time is 15ns.
“The detector leverages the company’s proprietary ‘black silicon’ technology,” according to the company. “ElFys has created a detector that combines high responsivity, low dark current and fast response times with precise positional information.”
Physically, there is a 70μm gap between adjacent segments – cross-talk is typically 2% with a 1kΩ lead.
The active surface is 5mm from the mounting surface, and 200μm from the window.
If heating is required, model QPD-385-YH has an integrated 40Ω heater and 1kΩ temperature sensor.
Both heated and unheated versions come in a top-hat can whose barrel is 25mm in diameter.
Operation is across -40 to +85°C and maximums are 250V (~2μA reverse leakage) and 10mA.
Applications are foreseen tracking and aligning 1,064nm YAG lasers, laser-guided munitions, free-space optical communication beam pointing, and auto-collimation angular measurement.
