6 results about "Spectral window" patented technology

The invention discloses a preparation method of an environment-friendly AgInS2 / ZnS quantum dot for self-reference fluorescence temperature sensing in a low-temperature range of 80K to 300K. The used AgInS2 / ZnS quantum dots are simple in preparation process and low in energy consumption, and do not contain heavy metal elements which have potential hazards to human bodies or the environment. The photoluminescence emission spectrum of the quantum dot has a remarkable temperature dependence characteristic, the luminous intensity is sequentially reduced along with the temperature rise, the red shift of an emission peak is weak along with the temperature rise, and the half-peak width change is not obvious. Two equal-width narrow spectrum windows are selected on the left side and the right side of an emission peak, and curve areas S1 and S2 in the left narrow window and the right narrow window selected at different temperatures are calculated through integration. R = (S1-S2) / (S1 + S2) is defined. Through fitting, R and the temperature are in a linear relation. The linear relation is a low-temperature self-reference fluorescence temperature sensing principle. Based on the characteristics, the environment-friendly quantum dot can be used as a core material of a self-reference temperature sensor, and an environment-friendly and efficient feasible scheme is provided for low-temperature detection.

A 3D sensing depth camera involves a time-frequency multiplexed frequency-modulated continuous wave (FMCW) LiDAR technique. A sample arm of such a system for 3D depth sensing includes a scanner for beam scanning in a first axis and a diffractive optical element for spectrally encoded scanning along a second axis. The sample arm can further include beam shaping optics such as a collimator and a lens. Processing of an interferogram comprising depth information at a different position along the second axis for each frequency sweep of the light source involves applying a windowed spectral estimator at a particular spectral window size with zero-padding and according to a specified lateral sampling approach.

A monochromator apparatus in a grating-based optical spectrum analyzer (OSA) includes a diffraction grating element, a reflector element, and a tunable spectral filter. The tunable spectral filter may be placed in a ghost signal path between the diffraction grating element and the reflector element, or between the diffraction grating element and an output element to prevent an optical ghost signal from passing to the output element. The tunable spectral filter may include a band-pass filter, a low-pass filter, a high-pass filter, or a linear variable filter. A spectral window of the tunable spectral filter may move synchronously with a scanning spectral window of the OSA to reduce or eliminate the optical ghost signal.

The application discloses a micro-plastic fluorescent fingerprint detection method and belongs to the technical field of fluorescent detection. In view of the problem that traditional portable fluorescent methods are easily interfered by particle size, concentration, aging degree and matrix background due to the dependence on single peak intensity signal, leading to low discrimination accuracy, at least two narrow-band LED light sources with different central wavelengths are adopted to irradiate the sample in turn or simultaneously, and the fluorescent signal intensity of at least three emission spectral windows is detected synchronously or sequentially, the intensity ratio between signals is calculated to construct a feature, and the feature is input into a pre-trained classification model to realize high-accuracy discrimination of micro-plastic polymer types. The method is mainly used for rapid identification and classification of micro-plastics in environmental water.

A monochromator apparatus in a grating-based optical spectrum analyzer (OSA) includes a diffraction grating, a reflector element, and a tunable spectral filter. The tunable spectral filter may include a band-pass filter, a low-pass filter, a high-pass filter, or a linear variable filter, for example. A spectral window of the filter may move synchronously with the scanning spectral window of the OSA. A high-pass filter implementation may be introduced during a subsequent portion of the OSA window before the optical ghost signal starts appearing. The filter may either be linearly scanned across the optical beam, angularly tuned, or introduced in a subsequent portion of the OSA scanning window.

The present invention describes a system and method for the selective separation and purification of gaseous isotopes and mixtures, with particular application in the production of Protium (H1) and Deuterium (D2). The system comprises a hyperboloid reactor equipped with a monolayer graphene membrane reinforced with boron nitride. The technical process is based on the induction of a quantum metamorphosis by means of an electromagnetic resonance emitter tuned to a spectral window of 1.0 THz to 2.5 THz. This excitation tunes the wavefunction of the target light species, increasing its probability of tunneling through the membrane's potential barrier. A differential pressure vector acts as a pneumatic motor to facilitate permeate flow, while non-resonant species are rejected by Pauli repulsion. The operating cycle is managed by the SITCR-Logic control unit, ensuring a continuous, efficient, and high-purity process.