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.

Systems and methods for detecting a biological analyte are provided. The biological analyte can be, for example, cortisol. Detection can be achieved without external labels/mediators. Microfluidic systems can be incorporated into the optical sensor for enhanced point-of-care applications. The sensor can be used in a variety of low-power electronics for wearable applications.

According to various embodiments, there is provided an electronic device including a first housing having a bottom surface formed to be disposed on a specific portion of a top surface of a toilet, a second housing connected to one side of the first housing, a third housing connected to another side of the first housing and having a shape extending from a point connected to the first housing by a specific length in a direction associated with a first curvature, and a detection unit having a shape of a second curvature corresponding to the first curvature, and the detection unit is rotatably coupled to at least a portion of the third housing.

One or more techniques and/or systems are provided for waste object detection. For example, a waste alert component is configured to emit ultraviolet light towards a waste detection zone, such as a bathroom floor or countertop. If a waste object, such as a paper towel or other object with a fluoresce property, exists within the waste detection zone, then the waste alert component may detect an increase in light due to the waste object fluorescing visible light in response to the ultraviolet light. If the increase in light intensity exceeds a detection threshold, then the waste alert component may provide a waste detection alert that the waste object exists within the waste detection zone (e.g., a message may be sent to a housekeeper that paper towel waste in on the bathroom countertop).

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.

A system and a method for determining a concentration region for a measurement of a response value by means of a calibration curve is disclosed. The calibration curve includes response values as a function of concentrations. The method includes providing a series of measured calibration data; fitting a regression model to the series of measured calibration data; calculating a standard deviation and a standard error for the measured calibration data; calculating a probability using the t-distribution with parameters including degrees of freedom and a requested confidence interval; calculating a response value interval; applying the response value interval to the calibration model; measuring a response value for a sample; and determining the concentration region by means of the response value interval and the calibration model.

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 method of comparison of spectra from the spectrum of a sample and at least one spectrum of a reference library is provided. The method involves: obtaining at least one relevant spectral peak from the sample spectrum and comparing each of the relevant spectral peaks obtained with the spectra in the reference library. Methods are also described for: comparison of spectra from the second derivative of the sample spectrum and the second derivative of the reference library spectra; and comparison of spectra with the previous identification of the major component of a sample, which involves correlating triangularly the spectra of the sample, the reference and the major component.

The present teachings relate to a method of generating calibration information during a real-time polymerase chain reaction (RT-PCR) or other amplification reaction. A sample well plate or other support can contain one or more dyes or other reference materials that are subjected to the same RT-PCR thermal cycles or other conditions used to conduct amplification or other reactions on a biological sample. A set of maxima values and a set of minimum values, and/or other calibration information useful for adjusting emission data for sample dyes can be recorded, for example, for 10 cycles, 20 cycles, or each cycle of a complete RT-PCR run. Such testing of dye response under realistic operating conditions can enable more accurate characterization of plate, dye, filter, or instrument response and therefore more accurate calibration corrections and other and/or adjustments.

One or more techniques and/or systems are provided for waste object detection. For example, a waste alert component is configured to emit ultraviolet light towards a waste detection zone, such as a bathroom floor or countertop. If a waste object, such as a paper towel or other object with a fluoresce property, exists within the waste detection zone, then the waste alert component may detect an increase in light due to the waste object fluorescing visible light in response to the ultraviolet light. If the increase in light intensity exceeds a detection threshold, then the waste alert component may provide a waste detection alert that the waste object exists within the waste detection zone (e.g., a message may be sent to a housekeeper that paper towel waste in on the bathroom countertop).