Abstract:
[Object] To find, with high sensitivity, an unevenness defect or the like that has occurred on the surface of an inspection object having a surface roughness comparable to wavelengths of visible light and is comparable to several times the surface roughness, and accurately distinguish between dirt and an unevenness flaw present on the surface of the inspection object, and also enable a reduction in the size of an apparatus. [Solution] An inspection object imaging apparatus according to the present invention includes: a light source configured to produce a light beam belonging to an infrared wavelength band and having a predetermined spread half-angle on a surface of an inspection object; a projection optical system configured to project the light beam on the surface of the inspection object at a predetermined projection angle; and an imaging unit configured to image reflected light from the surface of the inspection object. The imaging unit includes an imaging optical system including at least one convex lens, configured to condense reflected light and branch the reflected light to two different directions, and a first image sensor and a second image sensor each configured to image the reflected light that has passed through the imaging optical system. The first image sensor is positioned on the inspection object side with respect to a position of the imaging optical system that is conjugate with the surface of the inspection object, along an optical axis of the reflected light. The second image sensor is positioned on the reflected-light travel direction side with respect to the conjugate position.
Abstract:
Radiation scattering is one of the main contributors to the uncertainty of near infrared (NIR) measurements. Enhanced absorption-measurement accuracy for NIR sensors is achieved by using a combination of NIR spectroscopy and time-of-flight techniques to select photons that are the result of a given mean free path within a moving sample target. By measuring absorption as a function of path length or by windowing signals that are attributable to excessive scattering of NIR radiation within the sample, this technique affords the calculation of more accurate and more universal calibrations. The NIR sensor employs short or ultra-short laser pulses to create NIR that is directed to the moving sample and emerging radiation is detected over time. Windowing effectively truncates non-contributing measurements.
Abstract:
An optical pulse source 30 comprising a DPSS pump laser 31, a photonic crystal fibre (PCF) 35 and acousto-optic modulator (AOM) gating means 33. The pump pulses are coupled through lenses 32 to the AOM 33, synchronised to the pump laser 31 and operable to gate the pump pulses to a reduced repetition rate Rr = Rf/N, where Rf is the pump laser fundamental frequency. The pulses from the AOM 33 are injected via optics 34 into the PCF 35. Propagation through the PCF 35 causes the pulses to broaden spectrally to produce supercontinuum pulses. An optical pulse source comprising the optical pulse source 30 and an acousto-optical tunable filter (AOTF) operable to convert supercontinuum pulses into wavelength variable output pulses is also provided. A method of scaling the energy of the optical supercontinuum pulses is also provided.
Abstract:
An integrated circuit includes a photodetection region configured to receive incident photons. The photodetection region is configured to produce a plurality of charge carriers in response to the incident photons. The integrated circuit also includes at least one charge carrier storage region. The integrated circuit also includes a charge carrier segregation structure configured to selectively direct charge carriers of the plurality of charge carriers into the at least one charge carrier storage region based upon times at which the charge carriers are produced.
Abstract:
Provided are a Raman signal measuring method and apparatus (1000) which use a difference in a time scale between Raman scattered light and fluorescence. Thus, after exciting light is incident upon a target object, light scattered from the target object may be detected before the target object generates fluorescence in response to the exciting light. As a result, a Raman signal in which background fluorescence is reduced may be obtained.
Abstract:
A method for downhole fluid analysis by optical spectroscopy with photoacoustic detection includes positioning a photoacoustic system within a wellbore, applying a laser pulse to the fluid sample using the pulsed laser system, detecting, by the acoustic sensor, a time-resolved acoustic pulse generated by absorption of the laser pulse by the fluid sample, and determining a property of the fluid sample using the detected time resolved acoustic pulse. The photoacoustic system includes a pulsed laser system and an acoustic sensor.
Abstract:
Die vorliegende Erfindung betrifft eine Vorrichtung zur laserinduzierten Plasmaspektroskopie für die Detektion eines in einer Probe enthaltenen Elements. Die erfindungsgemäße Vorrichtung umfasst eine gepulste Laserquelle (10) zur Erzeugung eines Plasmas (16) einer Probe (12) und einen Detektor (14) zur Detektion eines Spektrums der von dem erzeugten Plasma (16) emittierten Strahlung, sowie eine Auswerteeinheit (18) zur Detektion des Kontrastmittels aus dem detektierten Spektrum, wobei die gepulste Laserquelle (10) ausgebildet ist, einen ersten Laserpuls (20) mit einem zeitlichen Abstand zwischen 100 ps und 100 µs zu einem zweiten Laserpuls (22) zu erzeugen. Die Probe kann eine biologische Probe sein, die ein Kontrastmittel enthält, das detektiert werden soll. Typische Kontrastmittel in klinischen Anwendungen sind Gadolinium (Gd) sowie Jod (I).
Abstract:
The present invention provides a novel category of naphthalene-based two-photon fluorescent probes having a general formula I, wherein: X is selected from the X 1 , X 2 , X 3 and X 4 ; The mentioned two-photon fluorescent probes have a low fluorescence background in the non-tumor cells and tissues, and have a strong and specific fluorescent signal in the tumor cells and tissues. These probes have a certain level of water-solubility, while having good membrane permeability. In addition, they have a bigger effective two-photon absorption cross section. The compounds of the present invention also have a lower biotoxicity, phototoxicity and photobleaching. There is sufficient difference between the spectral range thereof and that of a biological sample.
Abstract:
A method and a system for detecting the presence of propellant gas in a gaseous sample exploit laser light especially in the 3.30-3.5 μm range. The propellant can be propane, n-butane, i-butane, dimethyl ether, methyl ethyl ether, HFA 134a, HFA 227, or any other propellant exhibiting absorption in the requisite wavelength range. The presence of the application of this method in leak testing of propellant-containing containers such as aerosols or fuel canisters, permits high-speed, high accuracy leak detection capable of replacing existing testing methods.