38results about How to "Improve sensing characteristics" patented technology

The invention discloses an ONOO ‑ A fluorescent probe, a preparation method and an application thereof belong to the technical field of fluorescent probes. ONOO of the present invention ‑ The structural formula of the fluorescent probe is: ONOO of the invention ‑ Fluorescent probes have high sensitivity and selectivity, and can detect ONOO ‑ Quick response, with good promotion and application value.

The invention belongs to the technical field of optical fiber sensing, and in particular relates to a graphene-enhanced tilted fiber grating leakage mode resonant sensor with excellent characteristics such as high sensitivity, high measurement accuracy, and fast response speed for small changes in low-refractive-index objects to be measured and its detection. A system comprising a light source, a polarization controller, a sample cell to be tested, a tilted fiber grating, and a spectrum analyzer, wherein the tilted fiber grating includes a core and a cladding, and the core region is written with a tilt angle of 6 to 10° The cladding surface of the inclined grating area is coated with graphene, and the two ends of the graphene are coated with metal film electrodes. By changing the voltage on the metal electrode, the photoelectric properties of graphene can be dynamically adjusted, thereby enhancing the leaky mode resonance of the tilted fiber Bragg grating. The leaky mode resonance has better sensing characteristics than the existing resonance technology, especially for low refractive index regions. The leakage mode resonance exhibits higher sensing sensitivity and sensing accuracy for detecting small changes in substances.

The invention provides a refractive index sensing device based on the surface plasmon resonance of an inclined optical fiber grating, which includes a broadband light source, a polarizer, a polarization controller, an optical isolator, and a sensor formed by a long-period optical fiber grating with a very large inclination angle and a metal film. Sensing probe and spectrum analyzer. The broadband light source generates wide-band incident light, and outputs a single polarized light after passing through the polarizer, polarization controller and optical isolator, and then imports it into the parameter-optimized sensing probe, where the polarized light is coupled to low-order or high-order polarized cladding modes and generate corresponding resonance peaks at the output; among them, s-polarized light is only coupled to s-polarized low-order or high-order cladding modes, and p-polarized light is coupled to low-order or high-order p-polarized cladding modes and in The plasma resonance wave is excited in the metal film; the change of the resonant wavelength of the output spectrum with the refractive index of the sample to be tested is recorded by the spectrum analyzer to realize the detection of the sample to be tested. The sensing device of the invention effectively enhances the degree of interaction between the sample to be tested and the surface plasmon resonance wave, and improves the sensing sensitivity and resolution.

The invention belongs to the field of biochemical medical sensor design of fiber Bragg grating and particularly relates to a refractive index sensing device and a refractive index sensing method of aninner cladding modulated tilted fiber Bragg grating. The resonant strength of the tilted fiber Bragg grating is greatly enhanced by introducing refractive index modulation (namely, inner cladding modulation) in the cladding close to a fiber core area of the tilted fiber Bragg grating, so that the detection sensitivity is greatly improved; the sensing is realized by monitoring the resonant strength of the sensor rather than the change of resonant wavelength along with a to-be-measured material, so that the preparation process of the sensor is simplified and the cost of a detection device is greatly reduced; high sensitivity and high precision refractive index sensing detection from gas in a low refractive index region to liquid in a high refractive index region can be achieved by further regulating the resonant strength of the sensor in different to-be-detected material environments.