摘要:
Systems and methods are disclosed for detecting the concentrations of constituent gases in a sample. Systems may include a sample chamber configured to contain a volume of a gas, a light source configured to emit infrared light through the volume of the gas, a reference channel, a plurality of active channels, and processing circuitry. The reference channel and the active channels can each include a bandpass optical filter configured to receive light from the light source and selectively pass a portion of the light within a unique range of wavelengths, and a photodetector configured to detect infrared light from the light source that passes through the bandpass optical filter. The processing circuitry can be configured to calculate the concentrations within the sample gas of a plurality of constituent gases based at least in part on the light detected at each of the photodetectors.
摘要:
Disclosed is a method of generating a correction function for a light-emitting diode (LED) testing process. The method comprises the steps of: detecting light emitted by a reference LED and reflected from one or more inactive LEDs on a panel within a field of view of a detector, a number of said inactive LEDs within the field of view being varied such that uncorrected values of at least one optical parameter are derivable as a function of the number of inactive LEDs in the field of view; detecting light emitted by the reference LED, or by an active LED having identical optical properties to the reference LED, in the absence of any other LEDs, to determine at least one reference value for the or each said optical parameter; and calculating differences between the uncorrected values and the or each reference value to generate the correction function, the correction function being based on the number of inactive LEDs which are arranged within the field of view of the detector when the detector detects light emitted by an LED under test.
摘要:
The present invention relates to especially microfluidic analysis systems where the emitted light of a emitting source is measured by optic detection, and where a transparent body separates the emitting source from the optic detector. The invention especially relates to optic calibration of the device, the calibration being related to changes in the transparency of the transparent body and/or changes in the temperature of the emitting source.
摘要:
An optoelectronic device for measuring the water content in a plant element and an apparatus designed to evaluate and monitor in real time the state of hydration of the plant covers. The device includes an optoelectronic probe connected to a measurement module, the probe including: i) a first light source emitting at a wavelength corresponding to a strong water absorption band; ii) optionally, a second light source emitting at a wavelength close to the first source and weakly absorbed by water; and iii) a photo receiver having a spectral response that corresponds to the emission bands of the first light source or of the first and second light sources, the device including elements for modulating the average optical power emitted by the light source or sources at a defined frequency, and elements for synchronously detecting the light received by the photoreceiver.
摘要:
A device is provided for determining the water content of a target (1), the device having at least one source of target radiation (2), at least one source of reference radiation (4) directed to a target surface (10), and at least one detecting element (3) for measuring the intensity of radiation reflected back by the target surface. During use the at least one source of target radiation (2), the at least one source of reference radiation (4), and the at least one detecting element (3) are arranged immediately opposite the target surface (10). A pressurizing device using air or gas is provided, by which an artificial movement of the air or gas atmosphere can be created in the area of the optical paths between the at least one source of target radiation (2) and the target surface (10), and/or between the at least one source of reference radiation (4) and the target surface (10), and/or between the target surface (10) and the at least one detecting element (3).
摘要:
An optical measuring instrument includes: a flow channel for allowing a specimen to be circulated therein; a first light source including a light emitting diode for emitting light to be used for optical adjustment and/or image confirmation in the flow channel; a second light source for irradiating light upon the specimen circulated in the flow channel; and a light detector for detecting the spectrum intensity of the light emitted from the first and second light sources.
摘要:
There is disclosed a turbidimeter with an optical sensor having an IRED surrounded by four radiation detecting solar cells mounted on a printed circuit board which is encapsulated by a transparent potting material in a cavity of a housing. Additionally, the printed circuit board has a temperature sensor mounted thereon which is utilized by a sensor operating circuit to control the magnitude of the diode energizing current to compensate for variations in component response due to temperature variations.
摘要:
Method of generating a correction function for a light-emitting diode (LED) testing process, including: detecting light emitted by a reference LED and reflected from inactive LEDs on a panel within a field of view of a detector; varying a number of the inactive LEDs to derive uncorrected values of an optical parameter as a function of the number of inactive LEDs; detecting light emitted by the reference LED, or by an active LED having identical optical properties, in the absence of any other LEDs, to determine at least one reference value for each optical parameter; and calculating differences between the uncorrected values and each reference value to generate the correction function, the correction function being based on the number of inactive LEDs which are arranged within the field of view of the detector in the light detecting step.
摘要:
In a medical pulse oximetry sensor (10) at least two light emitting diodes (16, 18) are disposed to emit red light and infrared light through a portion of a subject's anatomy with a typically high oxygenated blood throughput. Typically, this area is also relatively narrow, to allow the light to pass through the area with acceptable attenuation, such as a finger or an earlobe. Light emitted from the LEDs (16, 18) is incumbent upon an integrated circuit (22) printed from a single CMOS substrate (21). The integrated circuit (22) includes all preprocessing and post-processing elements needed to convert the detected light signals into a pulse oximetry measurement. These elements include a photodetector (20), a photo pre-amplifier (40), a sampler/holder (42), an analog to digital converter (44), a microprocessor (46) a rangefinder (48), a timing control circuit (50) and an LED control circuit (52). By integrating all pre and post processing functions into the carriage housing (12), the system becomes more efficient, less expensive to manufacture, and more robust to ambient light and x-ray radiation.
摘要:
An optical measuring instrument includes: a flow channel for allowing a specimen to be circulated therein; a first light source including a light emitting diode for emitting light to be used for optical adjustment and/or image confirmation in the flow channel; a second light source for irradiating light upon the specimen circulated in the flow channel; and a light detector for detecting the spectrum intensity of the light emitted from the first and second light sources.