Abstract: A measurement system is disclosed which includes a vessel configured to suspend molecules of interest therein, optical sources configured to excite the molecules of interest by an excitation light activated and deactivated in a stepwise fashion, during the activation, the sources activated according to a pulse train, the molecules of interest emitting emission light in response to being excited by the excitation light, one or more sensor packages each comprising a plurality of photodetectors configured to receive emission light from the molecules of interest and, in response, provide an output voltage signal and an output current signal corresponding to photoelectron response of an incident photon on the one or more sensor packages, and a detector configured to determine successive single molecular decay of the molecules of interest, generate an emission pulse associated with each incident photon on the one or more sensor packages, and count the number of emission pulses.

Abstract: A measurement system is disclosed which includes a spot-traversal system for causing relative motion between a sample and an irradiation spot in a first direction, wherein the sample includes one or more fluorescent markers having respective fluorescence wavelengths, a gating system configured to provide a gating signal based at least in part on resultant light substantially at a wavelength of the irradiation spot, and an optical detection system configured to detect fluorescent light from at least some of the fluorescent markers irradiated by the irradiation spot, and provide detection signal(s) representing the fluorescent light detected concurrently with a gate-open condition of the gating signal.

Abstract: A system is described wherein a plurality of lasers are used to irradiate particles in a flow cytometer's flow stream. In certain embodiments, a light source having a plurality of lasers configured for irradiation of a flow stream are disclosed where discrete intervals of irradiation by one or more discretely activated lasers are triggered by irradiation of one or more particles in the flow stream with one or more continuously on lasers.

Abstract: A measurement system is disclosed which includes a flow chamber configured to propagate a sample in a flow stream, one or more optical sources configured to irradiate the sample in the flow stream, one or more detector systems each configured to receive resultant light from the sample and, in response, generate a photon signal, the one or more detector systems each including one or more photon sensors each adapted to generate an electronic pulse in response to receiving a photon and a circuit operating in the giga hertz supporting the one or more photon sensors thus configured to count each individual photon in the resultant light from the sample.

Abstract: An optical underwater communication system is disclosed which includes a first transceiver and a second transceiver, each including one or more optical sources configured to provide light activated and deactivated according to a first bit stream, one or more sensor packages each comprising a plurality of photodetectors configured to receive light from the other transceiver and, in response, provide an output voltage signal and an output current signal, a detector configured to i) convert the output voltage signal and the output current signal to pulses associated with arrival of photons, and ii) count the number of pulses based on a predetermined timing sequence, an encoder configured to encode a message to be sent into a first bit stream, and a decoder configured to decode a message received into a second bit stream.

Abstract: A flow cytometry measurement system is disclosed which includes a flow chamber configured to flow particles of interest in a flow stream, one or more optical sources configured to excite the particles of interest by an excitation light activated and deactivated according to a pulse train thus causing particles of interest emitting emission light, one or more sensor packages each comprising a plurality of photodetectors configured to receive emission light from the particles of interest and, in response, provide an output voltage signal and an output current signal corresponding to photoelectron response of an incident photon on the one or more sensor packages, and a detector configured to determine successive single molecular decay of the particles of interest, generate an emission pulse associated with each incident photon on the one or more sensor packages, and count the number of emission pulses.

Abstract: A measurement system includes a system for causing relative motion between a sample and an irradiation spot. The sample includes fluorescent markers having respective wavelengths. A gating system provides a gating signal based at least in part on resultant light substantially at an irradiation wavelength. A detection system detects fluorescent light from the irradiated markers and provides detection signals representing the fluorescent light detected concurrently with a gate-open signal. In some examples, the detection system detects fluorescent light at multiple wavelengths and provides respective detection signals. A spectral discriminator arranged optically between the sample and the detection system receives the fluorescent light from the sample and provides respective fluorescent light at the wavelengths to the detection system. A flow cytometer can spectrally disperse resultant fluorescent light and measure the wavelengths separately.

Abstract: A system is described wherein multiple lasers are used to irradiate particles in a flow cytometer's flow stream. In certain embodiments, a light source having a first laser configured for continuous irradiation of a flow stream and one or more second lasers configured for irradiation of the flow stream in discrete intervals where each discrete interval of irradiation by the second laser is triggered by irradiation of one or more particles in the flow stream with the first laser. Methods for modulating the laser irradiation and measuring light intensity are also described. Also described is the computations and systems required to operate the one or more second lasers.

Abstract: A measurement system includes an optical source (e.g., laser) to irradiate a sample (e.g., a cell); a solid-state photon detector (SSPD) to receive resultant light from the sample; and a photon counter to count photons received by the SSPD. The photon counter can include a differentiator to provide a differentiated photon signal and a crossing detector configured to count photons based on a number of times the differentiated photon signal crosses a predetermined threshold level. In some examples, a pulse detector can provide a pulse-width signal from the SSPD output photon signal, and a pulse counter can count based on both a number of pulses and widths of the pulses. The SSPD can include a silicon photomultiplier (SiPM) array or a solid-state photomultiplier. Some examples use the measurement system to measure samples in fluids, e.g., in flow cytometers or multi-well plates.

Abstract: An optical underwater communication system is disclosed which includes a first transceiver and a second transceiver, each including one or more optical sources configured to provide light activated and deactivated according to a first bit stream, one or more sensor packages each comprising a plurality of photodetectors configured to receive light from the other transceiver and, in response, provide an output voltage signal and an output current signal, a detector configured to i) convert the output voltage signal and the output current signal to pulses associated with arrival of photons, and ii) count the number of pulses based on a predetermined timing sequence, an encoder configured to encode a message to be sent into a first bit stream, and a decoder configured to decode a message received into a second bit stream.

Abstract: A flow cytometry measurement system is disclosed which includes a flow chamber configured to flow particles of interest in a flow stream, one or more optical sources configured to excite the particles of interest by an excitation light activated and deactivated according to a pulse train thus causing particles of interest emitting emission light, one or more sensor packages each comprising a plurality of photodetectors configured to receive emission light from the particles of interest and, in response, provide an output voltage signal and an output current signal corresponding to photoelectron response of an incident photon on the one or more sensor packages, and a detector configured to determine successive single molecular decay of the particles of interest, generate an emission pulse associated with each incident photon on the one or more sensor packages, and count the number of emission pulses.