Disclosed are methods of determining the suitability of a variable-length spectrophotometer using Patent Blue dye or AMG Blue dye. Also disclosed herein are methods of determining the suitability of a fixed path length spectrophotometer for determining protein concentration of a protein sample. AMG Blue dye may also be used to determine the suitability of fixed path length spectrophotometers.

A fluorimeter reference cell comprising a rare earth salt solution or other optically transparent solution with a well-defined and characteristic absorbance pattern which material emits an absorption spectrum when an excitation light is incident upon it. The absorption spectrum has a defined characteristic enabling wavelength calibration of the fluorimeter. The reference cell comprises a second material, a light scattering colloid such as colloidal silica. The dispersive properties result in the absorption spectrum being scattered or reflected at an angle to the angle of incidence

The present disclosure, among other things, describes a reader system comprising a casing, an optical system, an electromechanical motor system, and one or more digital processors.

There is provided a method of calibrating a sensor comprising a luminescent compound having a luminescence that depends on the concentration of an analyte, and a detector configured to detect light emitted by the luminescent compound, the method comprising providing a component comprising the luminescent compound in a package that maintains exposure of the luminescent compound to the analyte at a known first concentration, assembling the component into the sensor and measuring a first value of a characteristic of the luminescence of the luminescent compound while exposed to the analyte at the first concentration, measuring a second value of the characteristic of the luminescence of the luminescent compound while exposed to the analyte at a known second concentration different from the first concentration, and determining parameters representing the dependence of the characteristic of the luminescence on concentration of the analyte using the first value and the second value.

An integrated stage for holding rapid test reagent cards includes two U-shaped sidewalls opposite to each other, a first receiving space, a second receiving space, and an elastic sheet. The U-shaped sidewalls cooperatively define the first receiving space. The second receiving space is formed in the first receiving space and is lower than the first receiving space. The elastic sheet is arranged on a short side of the first receiving space. The first receiving space is used for allowing the integrated stage to hold a first rapid test reagent card. The second receiving space is used for allowing the integrated stage to hold a second rapid test reagent card. The integrated stage utilizes the elastic sheet to hold and fix the first rapid test reagent card or the second rapid test reagent card.

In an example method, an ordered array of microdots including an analyte printed on a surface of a surface-enhanced substrate of an analysis chip is probed with an excitation beam of electromagnetic radiation. Emitted radiation is detected from a number of microdots of the ordered array of microdots. Calibration data is generated for the analysis chip with respect to the analyte based on a detected shift in the emitted radiation as compared to the excitation beam.

A method for true-to-sample measurement by a mobile ingredient analysis system having a housing with a window, an interface for an external reference unit, a display and operating unit, a light source, an optical spectrometer, a camera, an internal reference unit, and an electronic control unit. The method includes: selecting a calibration product suitable for a sample to be examined; performing a plausibility check of the calibration product, an incorrect selection being signaled and an alternative calibration product being selected; outputting measurement conditions comprising the measurement point to be selected and measurement duration for the selected calibration product; capturing measured values of the sample by the spectrometer under the measurement conditions and with simultaneous monitoring of the measurement conditions; processing the captured measured values by means of an electronic control unit, each measured value captured while the measurement conditions were met being declared valid; outputting the measured values deemed valid.

An example fixture includes a hollow elongate section having a first end and a second end, and the first end has an opening for receiving a lens portion of an imaging device and the second end is structurally configured to brace against a surface of an object being imaged. The hollow elongate section is configured to hold the lens portion of the imaging device at a fixed distance from an object being imaged and to control an amount of incident light on the lens portion. Example methods of configuring an imaging device for capturing images of an object include holding, via a fixture, a lens portion of an imaging device at a fixed distance from an object being imaged, controlling an amount of incident light on the lens portion of the imaging device, and holding a calibration object in a field of view of the imaging device.

A system and method for calibration of a fluorometer using a calibration cell comprising a sealed container housing one or more calibration solutions of known fluorescence. The inventive calibration device includes a sealed calibration cell housed in a storage chamber that may be permanently or temporarily affixed to the top of a fluorometer such that the calibration solution can be moved by manual or automated means directly from the storage chamber to the fluorometer cell for a calibration operation. All of the solution needed for any given calibration can be contained exclusively, in small quantity, inside the calibration cell.

The present invention provides a calibration device for an optical detector comprising a light emitting diode 1, and an electronic circuit 3 for driving the light emitting diode 1, wherein the electronic circuit 3 is a constant current generator configured to supply a constant driving current to the light emitting diode 1 in the range of 0.5 to 25 μA. Furthermore, the present invention provides a setting device for setting at least one calibration point for a calibration device as described above. The setting device comprises a light detector 51 configured to output a signal representing the light emission intensity of a calibration device under examination, a controller 53 for controlling the constant driving current of the calibration device under examination, and a calibration point setting means 55 for setting at least one calibration point for the calibration device under examination.