A dynamic Raman signal acquisition apparatus, system, and method involving: an excitation light source operable at a designated irradiation power and for a designated acquisition time for each Raman data acquisition; a Raman probe operatively associated with said excitation light source to irradiate the biological tissue at said designated irradiation power and for said designated acquisition time, and capture an optical Raman response therefrom; a spectrometer operable to spectrally analyze said optical Raman response; and a controller in operative communication with said excitation light source and said spectrometer to automatically adjust at least one signal acquisition parameter.

A Light Emitting Diode (LED) is added to a weed control system for calibrating the weed control system. A detector generates an electrical signal based on receiving light emitted by the LED. An electronically-tunable capacitor of a bandpass filter is adjusted based the signal received from the detector to adjust a center frequency of the bandpass filter so that light from an optical source, different from the LED, can more efficiently be detected by the weed control system.

A method and system for calibrating a PET scanner are described. The PET scanner may have a field of view (FOV) and multiple detector rings. A detector ring may have multiple detector units. A line of response (LOR) connecting a first detector unit and a second detector unit of the PET scanner may be determined. The LOR may correlate to coincidence events resulting from annihilation of positrons emitted by a radiation source. A first time of flight (TOF) of the LOR may be calculated based on the coincidence events. The position of the radiation source may be determined. A second TOF of the LOR may be calculated based on the position of the radiation source. A time offset may be calculated based on the first TOF and the second TOF. The first detector unit and the second detector unit may be calibrated based on the time offset.

In accordance with certain embodiments, a smoke detector determines the presence of smoke particles outside its housing based on measurements of light detected at different wavelengths and corrected based on an ambient light level.

A Light Emitting Diode (LED) is added to a weed control system for calibrating the weed control system. A detector generates an electrical signal based on receiving light emitted by the LED. An electronically-tunable capacitor of a bandpass filter is adjusted based the signal received from the detector to adjust a center frequency of the bandpass filter so that light from an optical source, different from the LED, can more efficiently be detected by the weed control system.

In an FTIR 1, a beam splitter 12, fixed mirror 13 and movable mirror 14 are shared by a main interferometer 10 including a multiwavelength infrared light source 11 and a control interferometer 20 including a semiconductor laser 21. A first detector 16 detects infrared interference light generated by the main interferometer 10 and transmitted through or reflected by a sample. A second detector 26 detects monochromatic interference light generated by the control interferometer 20. A spectrum creator 32 determines an optical path difference between an optical path via the fixed mirror 13 and an optical path via the movable mirror 14, based on the intensity and uncalibrated oscillation wavelength of the monochromatic interference light detected by the second detector 26, and creates a spectrum by performing fast Fourier transform on an interferogram which shows a distribution of the intensity of the infrared interference light detected by the first detector 16 with respect to the optical path difference. An oscillation wavelength calibrator 34 locates an absorption peak of carbon dioxide from the peaks in the spectrum created by the spectrum creator 32, and compares a wavenumber or wavelength of the absorption peak with a true absorption wavenumber or wavelength of carbon dioxide to determine a calibrated oscillation wavelength of the semiconductor laser 21.

Techniques for colorimetric based test strip analysis and reader system are provided. In one aspect, a method of test strip analysis includes: illuminating a test strip wetted with a sample with select spectrums of light, wherein the test strip includes test pads that are configured to change color in the presence of an analyte in the sample; obtaining at least one digital image of the test strip; and analyzing color intensity from the at least one digital image against calibration curves to determine an analyte concentration in the sample with correction for one or more interference substances in the sample that affect the color intensity. A calibration method and a reader device are also provided.

The invention relates to a system for monitoring air quality in an environment, including at least one mobile robot (20) in the environment, a docking station (10) placed in the environment and including a parking area for receiving the robot, air quality sensors on board the mobile robot, air quality sensors fitted in the docking station, and a calibration manager for collecting measures carried out by at least one air quality sensor on board the mobile robot (20) while the mobile robot is received in the parking area of the docking station (10), and measures carried out at the same time by another air quality sensor fitted in the docking station, of the same type as the on-board air quality sensor.

Aspects of the present disclosure describe gas sensor calibration methods and subsequent sensing methods employing same in conjunction with wavelength modulation spectroscopy (WMS). Additional aspects of the present disclosure advantageously employ WMS for highly-sensitive gas concentration measurement across a range of concentrations from ambient to a high concentration environment such as fire/smoke detection. Finally, still further aspects of the present disclosure determine and then employ two calibration factors and during measurement WMS-2f spectra to determine an inflection or turning point and subsequently which one of the two calibration factors to employ at a given concentration.

A method and system for calibrating a PET scanner are described. The PET scanner may have a field of view (FOV) and multiple detector rings. A detector ring may have multiple detector units. A line of response (LOR) connecting a first detector unit and a second detector unit of the PET scanner may be determined. The LOR may correlate to coincidence events resulting from annihilation of positrons emitted by a radiation source. A first time of flight (TOF) of the LOR may be calculated based on the coincidence events. The position of the radiation source may be determined. A second TOF of the LOR may be calculated based on the position of the radiation source. A time offset may be calculated based on the first TOF and the second TOF. The first detector unit and the second detector unit may be calibrated based on the time offset.