Optical detector
Assigneeams-OSRAM AG
InventorsBoon Chong Cheah, Alexander Volk, David Gamperl, Massimo Mascotto, Erik Jan Lous
Life of this patent
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Abstract
An optical detector (1) on an application specific integrated circuit (ASIC) comprises at least one photodiode (5) for receiving incident light and configured to provide at least one diode signal, a modulator (2) configured to provide an AC drive signal and to provide a reference signal associated with the AC drive signal; and a lock-in amplifier (6) configured to receive said at least one diode signal from said at least one photodiode (5) and to receive the reference signal from the modulator (2), and to determine at least one of a phase and an amplitude of said at least one diode signal using the reference signal.
Claims28
An optical detector on an application specific integrated circuit (ASIC) comprising:
- at least one photodiode for receiving incident light and configured to provide at least one diode signal;
- a modulator configured to provide an AC drive signal and to provide a reference signal associated with the AC drive signal;
- and
- a lock-in amplifier configured to receive said at least one diode signal from said at least one photodiode and to receive the reference signal from the modulator, and to determine at least one of a phase and an amplitude of said at least one diode signal using the reference signal.
A method of determining the amplitude and/or phase of light using an optical detector on an application specific integrated circuit (ASIC), comprising:
- driving a means for exciting a sample with an AC drive signal from a modulator;
- exciting the sample with the means;
- receiving with at least one photodiode light reflected by or emitted from or transmitted through the sample;
- receiving at a lock in amplifier at least one diode signal from the at least one diode and a reference signal associated with the AC drive signal from the modulator;
- and
- using lock-in detection to determine the phase and/or amplitude of the at least one diode signal from the at least one diode signal and the reference signal.
Dependencies are inferred from the claim text.