Abstract:
A novel dual spectra optical pyrometer is characterized by a serial array of photodetectors. The first photodetector absorbs a spectral portion of a target optical beam incident thereto, and passes the remainder optical beam to the second photodetector. Signals from both photodetectors are provided along with signals indicative of the first detector's spectral absorption and an estimate of the equivalent black body temperature of a fireball to a signal processor which provides a compensated temperature signal therefrom.
Abstract:
An optical instrument for measuring characteristics of a specimen comprises a light source and an axial reflective member spaced from the light source to define an optical axis for the instrument along a line between the light source and the reflective member. A non-axial reflector is positioned laterally of the reflective member and laterally of the optical axis to receive a beam reflected from the axial reflective member. The non-axial reflector is oriented to reflect the beam onto the specimen. The instrument also contains a segmented photosensor and a second non-axial reflector to receive the beam reflected from the specimen and reflect it onto the segmented photosensor. The photosensor is positioned in the instrument to receive the beam from the second non-axial reflector. A conductor connected to each segment of the photosensor is provided for carrying current to signal conditioning hardware used to compare the current from the segments of the photosensor to provide information concerning the specimen.
Abstract:
An optical instrument for measuring characteristics of a specimen comprising a light source to project a beam onto the surface of a specimen at a selected oblique angle of incidence .beta.. The instrument also contains a photosensor to receive the beam reflected from the specimen at the same angle .beta.. A conductor connected to the photosensor is provided for carrying current to signal conditioning hardware used to compare the current from two or more photosensors or, if present, from different segments of the same photosensor to provide information concerning the specimen. Photosensor means is also positioned facing the specimen on an optical axis located normal to the surface of the specimen and intermediate the incident and reflected beams from the light source to receive a beam reflected from the specimen normal to its surface, i.e., along the optical axis. Signals from the photosensors are fed to the signal conditioning hardware to measure the optical power and to compare signals for measuring characteristics of the surface, e.g., its reflectivity or reflectance and to locate its position and/or orientation with respect to the instrument.
Abstract:
An optical measurement device includes a light source, a first detector, and a second detector. The light source emits light to a measurement site of a patient and one or more detectors detect the light from the light source. At least a portion of a detector is translucent and the light passes through the translucent portion prior to reaching the measurement site. A detector receives the light after attenuation and/or reflection or refraction by the measurement site. A processor determines a light intensity of the light source, a light intensity through a tissue site, or a light intensity of reflected or refracted light based on light detected by the one or more detectors. The processor can estimate a concentration of an analyte at the measurement site or an absorption or reflection at the measurement site.
Abstract:
An optical measurement device includes a light source, a first detector, and a second detector. The light source emits light to a measurement site of a patient and one or more detectors detect the light from the light source. At least a portion of a detector is translucent and the light passes through the translucent portion prior to reaching the measurement site. A detector receives the light after attenuation and/or reflection or refraction by the measurement site. A processor determines a light intensity of the light source, a light intensity through a tissue site, or a light intensity of reflected or refracted light based on light detected by the one or more detectors. The processor can estimate a concentration of an analyte at the measurement site or an absorption or reflection at the measurement site.
Abstract:
An optical measurement device includes a light source, a first detector, and a second detector. The light source emits light to a measurement site of a patient and one or more detectors detect the light from the light source. At least a portion of a detector is translucent and the light passes through the translucent portion prior to reaching the measurement site. A detector receives the light after attenuation and/or reflection or refraction by the measurement site. A processor determines a light intensity of the light source, a light intensity through a tissue site, or a light intensity of reflected or refracted light based on light detected by the one or more detectors. The processor can estimate a concentration of an analyte at the measurement site or an absorption or reflection at the measurement site.
Abstract:
An infrared photometer having a measuring cuvette with entrance and exit windows and an output detector preferably made of polyvinylidenfluoride; a second infrared detector definitely made of polyvinylidenfluoride, being partially transmissive is disposed in front of the entrance window of the cuvette, and a selecting cuvette is insertible in front of this second detector.