A backside thermography technique was developed based on the temperature sensitivity of laser-induced fluorescence in flowing two-dye solutions. The approach utilizes visible light and optically transparent packaging materials to obtain spatially resolved transient thermal measurements. This technique is compatible with optically transparent water-cooled packaging, which will allow for the characterization of processes where heat is added as well as removed. A setup was designed, constructed, and used to study the performance of seven two-dye Rhodamine B (RhB)-Rhodamine 110 (Rh110) fluorescent solutions. The effect of dye concentration ratio on sensitivity, maximum frame rate, and excitation area was characterized. The system was used to demonstrate in-situ temperature measurements showing the importance of two-dye light compensation, as well as backside thermography using a simple droplet contact method to investigate temporal response. Droplet contact experiments were conducted on actively heated and cooled surfaces to study local temperature and heat flux behavior during phase change.

An optical device is provided. The optical device includes a time-of-flight (TOF) sensor array, a photon conversion thin film, and a light source. The photon conversion thin film is disposed above the time-of-flight sensor array. The light source emits light with a first wavelength towards the photon conversion thin film to be converted into light with a second wavelength received by the time-of-flight sensor array. The second wavelength is longer than the first wavelength.

Disclosed are a temperature measurement method using the fluorescence characteristic of an optical material having temperature dependence and a temperature sensor technology using the same. According to the present disclosure, the temperature measurement technology using the fluorescence signal intensity ratio has a self-compensation function to reduce optical signal noise caused by fluctuations in light source output and optical waveguide loss, and uses two fluorescence signals with a strong fluorescence signal intensity to solve the existing disadvantage of generating a lot of noise due to a low fluorescence signal.

Disclosed are a temperature measurement method using the fluorescence characteristic of an optical material having temperature dependence and a temperature sensor technology using the same. According to the present disclosure, the temperature measurement technology using the fluorescence signal intensity ratio has a self-compensation function to reduce optical signal noise caused by fluctuations in light source output and optical waveguide loss, and uses two fluorescence signals with a strong fluorescence signal intensity to solve the existing disadvantage of generating a lot of noise due to a low fluorescence signal.

The present technology discloses smart labels to monitor physical parameters, and for traceability and authentication of objects, documents or people. This active and multifunctional label is based on spectrally and spatially multiplexed Quick Response (QR) codes (A). Spectrally selectivity is achieved using luminescent materials and spatially multiplexing is achieved using different patterns (B) combining both to design improved QR codes able to store information at different layers of accessibility. This brings advantages over the actual scenario of QR codes wherein the amount of storage information increases up to three times, adding the capability to sense physical parameters and allow to control the provided information, creating public and restricted access. To access and read the content of each layer, different illumination is used (C) to (E) and is processed using a device or via dedicated applications.

Aerosol-deposited thermographic phosphors can be used for non-contact, two-dimensional temperature sensing in extreme environments. The fast response time and thermal/environmental stability of doped ceramic powders allow for temperature measurements up to the melting point of the phosphor on hot surfaces, such as rapidly rotating turbine components and combustors.

Aerosol-deposited thermographic phosphors can be used for non-contact, two-dimensional temperature sensing in extreme environments. The fast response time and thermal/environmental stability of doped ceramic powders allow for temperature measurements up to the melting point of the phosphor on hot surfaces, such as rapidly rotating turbine components and combustors.

An object provide a technique capable of measuring temperature on the basis of optically detected magnetic resonance with higher precision, The object is achieved by a method for measuring the temperature of an object on the basis of optically detected magnetic resonance of an inorganic fluorescent particle, including (a) irradiating the object, containing the inorganic fluorescent particle with each of multiple microwaves having different frequencies, (b) measuring the fluorescence intensities of the inorganic fluorescent particle with individual photon counters at the time of irradiation of respective microwaves, (c) correcting the fluorescence intensities on the basis of dependencies in the number of pulse measurements between the photon counters and (d) Calculating the temperature of the object on the basis of the obtained fluorescence intensity with the correction values.

An object provide a technique capable of measuring temperature on the basis of optically detected magnetic resonance with higher precision, The object is achieved by a method for measuring the temperature of an object on the basis of optically detected magnetic resonance of an inorganic fluorescent particle, including (a) irradiating the object, containing the inorganic fluorescent particle with each of multiple microwaves having different frequencies, (b) measuring the fluorescence intensities of the inorganic fluorescent particle with individual photon counters at the time of irradiation of respective microwaves, (c) correcting the fluorescence intensities on the basis of dependencies in the number of pulse measurements between the photon counters and (d) Calculating the temperature of the object on the basis of the obtained fluorescence intensity with the correction values.

There is provided a temperature sensor including an optical fiber, and a sensing element spaced from the optical fiber. The sensing element is encapsulated in a optically transparent, non-porous material, isolating the sensing element from a surrounding environment. The optical fiber is aligned with the sensing element to deliver a source beam to interact with the sensing element and detect a return beam, where the return beam exhibits a temperature dependent property that is measured to determine a temperature of a measured object thermally coupled to the sensing element.