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

A pressure detection device includes a sensing part that outputs an electrical signal responsive to an applied pressure, a pressure receiving diaphragm that receives a pressure from a subject device, a cylindrical stem having a first end connected to the sensing part and a second end connected to the pressure receiving diaphragm, and a pressure transmission member located within the cylindrical member to transmit the pressure received by the pressure receiving diaphragm to the sensing part. In the pressure detection device, a side wall portion of the cylindrical stem has a spring portion which is provided to generate an elastic force in an axial direction of the cylindrical member. Accordingly, fluctuations in a spring characteristic acting on a pressure transmission mechanism of the pressure detection device can be effectively restricted by the spring portion.

Provided is a suspended nanowire sensor having good sensing characteristics and suitable for mass production, a method for fabricating the suspended nanowire sensor. The suspended nanowire sensor includes: first and second sensor electrodes formed on upper portions of a substrate and physically separated from each other; and a nanowire sensor material piece extending from the first sensor electrode to the second sensor electrode and physically suspended between the first and second sensor electrodes.

The invention discloses a method for preparing a helical structure block copolymer semiconductor nanowire and its application. The block copolymer semiconductor material and the polymer insulation material are respectively dissolved in a solvent and then mixed to form a blend solution. By controlling the block The mass ratio of the copolymer semiconductor material and the polymer insulating material can obtain block copolymer semiconductor nanowires with different densities and diameters of helical structures. The block copolymer semiconductor nanowire of the present invention can be used as the semiconductor layer of an organic field-effect transistor ammonia sensor, which can improve the sensitivity of ammonia sensing and reduce the detection limit, and the nanowire can be changed only by changing the preparation process conditions. density and diameter. The present invention firstly prepares the block copolymer semiconductor nanowire with helical structure through the blending method, applies it to ammonia sensing and obtains higher sensing performance.

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 discloses an ultrathin film and a preparation method of an organic field-effect transistor sensor based on the ultrathin film. The preparation method is characterized by comprising the following steps: blending a polymer semiconductor material and a polymer insulating material in an organic solvent, and performing spin-coating to form a double-layer film; dissolving to remove the polymer insulating material film by adopting a good solvent, and obtaining the ultrathin film of the polymer semiconductor material; evaporating an electrode on the film, thereby obtaining the organic field-effect transistor sensor. The ultrathin film disclosed by the invention has the advantages of simple operation, high repeatability, low requirements on equipment and process conditions, no need of large precise instruments and equipment and the like; because the active layer has ultrathin thickness, the obtained sensor in the invention has the advantages of high sensitivity, high selectivity, low detection limit and the like, and has an important application prospect in the aspect of improving the sensing property of a gas sensor.

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 discloses a composite electrode and a preparation method and application thereof. Co of the present invention 3 O 4 The / NPG / Au composite electrode includes a gold electrode, a porous Au-Sn alloy layer and a nano-Co layer arranged in sequence from the inside to the outside 3 O 4 A deposition layer, the preparation method of which comprises the following steps: 1) depositing a porous Au-Sn alloy layer on the surface of the gold electrode by electrodeposition-dealloying to obtain an NPG / Au electrode; 2) depositing on the surface of the NPG / Au electrode by electrodeposition Nano Co 3 O 4 layer, that is, Co 3 O 4 / NPG / Au composite electrode. Co of the present invention 3 O 4 The / NPG / Au composite electrode can instantly detect the content of hydroquinone and catechol in water, has high sensing responsiveness, good stability and good anti-interference performance, and can be recycled for many times , the preparation method is simple.

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.

The invention relates to an elastic extensible spiral sensing optical cable which comprises an outer sheath and an optical fiber unit wrapped with the outer sheath. The elastic extensible spiral sensing optical cable is characterized in that the outer sheath is in a spiral coil shape, the circumference of the radial cross section of the outer sheath is rectangular, and the long edges of the rectangle are in the radial direction. The elastic extensible spiral sensing optical cable has the excellent elastic extending and bending performance, and can spring back, stretch and retract within a short time. Being used as a sensing optical cable, the elastic extensible spiral sensing optical cable has the excellent fluctuation conduction property due to the high-elasticity spiral structure, and the sensing property of the sensing optical fiber can be further broadened. An inner hole of the outer sheath is in an oval shape, the optical fiber unit has the enough loosening space even under the small outer diameter, the optical fiber has the good high and low temperature performance, and optical fiber signal transmission reliability is ensured. The elastic extensible spiral sensing optical cable has the excellent flame resistance, oil resistance, and liquefied gas and coal gas corrosion resistance, the reliability of the optical cable is effectively improved, the service life of the optical cable is effectively prolonged, the full-dry structure is achieved, all the units are reasonable in arrangement, and the optical cable is small in size, low in weight and convenient to use.