28results about How to "Small heat capacity" patented technology

The present invention belongs to the technical field of ultra-precision cutting, and specifically relates to a diamond tool device. It includes: a diamond tool, a tool holder, wherein the diamond tool has: an electrode; a boron-doped single crystal diamond layer, whose resistance changes with the temperature after being heated, and is used to sense the temperature of the cutting micro-area; and a single crystal diamond layer, which is bonded to the boron-doped single crystal diamond layer through atomic interaction; the tool holder has: a body, which is internally provided with a temperature acquisition circuit board and a power supply, an upper cover plate, and is provided with a constant current source shift button electrically connected to the temperature acquisition circuit board; the electrode is connected to the temperature acquisition circuit board through a wire, and the cutting edge of the diamond tool is arranged on the single crystal diamond layer. Since the present invention has a boron-doped single crystal diamond layer, its resistance changes with the temperature after being heated, so that the temperature of the cutting micro-area can be sensed during the working process, and can be used for online measurement of the cutting area temperature during the single-point diamond turning process.

The invention relates to the technical field of waste gas treatment equipment, and discloses waste gas purification equipment for a PE pipe production line, the waste gas purification equipment comprises a zeolite rotating wheel, the zeolite rotating wheel comprises a front cylinder and a rear cylinder, the front cylinder and the rear cylinder are internally and movably connected with a front rotating wheel and a rear rotating wheel which keep rotating respectively, and a separation cavity is formed between the rear rotating wheel and the front rotating wheel; a front adsorption cavity, a front desorption cavity and a front cooling cavity are arranged between the front barrel and the separation cavity, a rear adsorption cavity, a rear desorption cavity and a rear cooling cavity are arranged between the separation cavity and the rear barrel, the front adsorption cavity and the rear adsorption cavity are connected in series, and the end part of the front adsorption cavity is communicated with waste gas through an adsorption pipe. According to the waste gas purification equipment for the PE pipe production line, a tandem type double-rotating-wheel structure is adopted, high-boiling-point pollutants are preferentially adsorbed and borne through the front rotating wheel, and adjustable internal reflux and differential rotating speed design are matched, so that the problem of zeolite pore channel blockage is solved, meanwhile, the concentration multiple of low-concentration waste gas is greatly increased, and the service life of the waste gas is prolonged. And stable self-heating operation of the catalytic oxidation furnace is ensured.

The invention relates to the technical field of graphite boats, in particular to a method for prolonging the service life of a graphite boat, which comprises the following steps: S1, cleaning and drying the graphite boat and a silicon wafer to be coated with a film by using a pickling solution and a cleaning solution, and S2, cleaning the silicon wafer to be coated with the film by using a tubular PECVD (Plasma Enhanced Chemical Vapor Deposition) device under the conditions that the furnace temperature is 430-480 DEG C, the radio frequency current is 8-12A, the voltage is 400-420V and the power is 1.5-2.7 kW. And sequentially plating three layers of silicon films on the silicon wafer by adopting a plasma enhanced chemical vapor deposition method. When the graphite boat is cleaned, dried and coated, hydrofluoric acid is used as a pickling solution, low radio-frequency current is realized, the graphite boat adopts a round sticking point shape with a large contact area with a silicon wafer, and three layers of silicon films are sequentially coated on the silicon wafer by using a plasma enhanced chemical vapor deposition method; the problems that the coating color uniformity is poor, and the thickness of the surface film of the silicon wafer is not uniform are solved, the silicon wafer coating quality is remarkably improved, and the service life of the graphite boat is prolonged.

The utility model relates to the technical field of semiconductor preparation, in particular to a reactor for synthesizing electronic-grade silicon carbide powder. The graphite crucible comprises a straight barrel-shaped pot body and a cover body covering the pot body; first graphite paper is fully paved on the bottom surface and the side wall in the pot body, and second graphite paper is fully paved on the inner surface, facing the pot body, of the cover body; a raw material cavity is defined by the first graphite paper and the second graphite paper, the raw material cavity is divided into a plurality of independent reaction cavities through at least one piece of third graphite paper, and uniformly mixed carbon-silicon powder is placed in each reaction cavity; according to the reactor for synthesizing the electronic-grade silicon carbide powder, the uniformly mixed carbon-silicon powder is divided into multiple components by using more economical and effective graphite paper, and the bottom surface and the side wall in the crucible body are separated from a carbon raw material and a silicon raw material by using the graphite paper; the conditions that silicon carbide powder is not convenient to take out and the service life of the crucible is shortened due to the reaction of the carbon raw material and the silicon raw material with the crucible are effectively prevented.

The present disclosure relates to the technical field of infrared detection, and particularly relates to an amorphous silicon infrared detector pixel, a chip, a movement and equipment, the amorphous silicon infrared detector pixel comprising an absorption sensing part; the absorption sensing part comprises an amorphous silicon thermal sensitive layer and a metal electrode layer; the amorphous silicon thermal sensitive layer comprises a thermal sensitive working area and a non-thermal sensitive working area, the thermal sensitive working area has a first thickness, the non-thermal sensitive working area has a second thickness, the first thickness is greater than the second thickness, and the effective value of the second thickness is less than 2000 angstroms; the metal electrode layer is in contact with the non-thermal sensitive working area and at least the side surface of the thermal sensitive working area; wherein an adjacent pair of metal electrode layers located on the side surface of the thermal sensitive working area form quasi-parallel electrodes. Thus, the first thickness of the amorphous silicon thermal sensitive layer in the thermal sensitive working area is greater than the second thickness of the non-thermal sensitive working area, the thickness of the amorphous silicon thermal sensitive layer between the quasi-parallel electrodes is relatively thick, noise can be reduced, and the performance of the device is improved.

A heat pipe and heat conduction substrate welding device for aerospace electronic equipment comprises a pressing plate and a supporting plate which are arranged on the upper surface and the lower surface of a heat conduction substrate in a pressing mode respectively. A pressing strip is arranged on the upper surface of the pressing plate and right above each welding surface, and a space for pressing the heat pipe is reserved between the pressing plate and each welding surface; and a supporting unit is arranged between the supporting plate and each welding surface. By means of reasonable arrangement of component structures, poor welding quality and stability caused by the fact that local areas of the heat pipes are not in complete contact with welding faces in the welding process are avoided, effective welding of the heat pipes and the heat conduction substrate in the high-temperature environment is achieved, and meanwhile compactness and light weight of the welding device are guaranteed. The whole device is easy to implement, efficiency is greatly improved, labor, time and cost are saved, welding quality and stability of the heat pipe are improved, and heat dissipation reliability of aerospace electronic equipment is guaranteed.

The utility model relates to the technical field of fluidized bed roasting, in particular to a quartz sand purification furnace which comprises a vertical heating furnace, a horizontal heating furnace is arranged at the feeding end of the vertical heating furnace, a horizontal cooling furnace is arranged at the sand outlet end of the vertical heating furnace, and a collecting mechanism for collecting hydrogen chloride gas is arranged between the horizontal heating furnace and the vertical heating furnace. The furnace body frame is formed by welding national standard profile steel and steel plates, the structure is firm and reliable, and the hearth is made of high-purity aluminum oxide ceramic fiber materials; a rotating mechanism is made of high-quality steel, quartz products are prevented from being polluted by metal dust, a variable-frequency speed regulation acceleration and speed reduction machine is selected as a mechanical structure, a transmission shaft directly connected with the speed reduction machine drives a chain transmission mechanism, and the transmission mechanism is driven by a transmission shaft directly connected with the speed reduction machine to rotate. And the friction wheel is driven to act by chain transmission, the rotating speed is steplessly controlled, and the friction wheel adopts a high-temperature-resistant bearing and can bear the high temperature of 500 DEG C.

The present disclosure relates to the technical field of infrared detection, and particularly relates to an amorphous silicon infrared detector pixel, a chip, a movement and equipment, the amorphous silicon infrared detector pixel comprising an absorption sensing part; the absorption sensing part comprises an amorphous silicon thermal sensitive layer and a metal electrode layer; the absorption sensing part comprises a thermal sensitive working area and a non-thermal sensitive working area, the amorphous silicon thermal sensitive layer is located in the thermal sensitive working area, the amorphous silicon thermal sensitive layer in the thermal sensitive working area has a target thickness, the thickness of the amorphous silicon thermal sensitive layer in the non-thermal sensitive working area is zero, the thermal sensitive working area generates resistance change in response to a received thermal signal; the metal electrode layer is located in the non-thermal sensitive working area and at least contacts the side surface of the thermal sensitive working area; wherein, an adjacent pair of metal electrode layers located on the side surface of the thermal sensitive working area form quasi-parallel electrodes. Thus, by setting the thickness of the amorphous silicon thermal sensitive layer in the non-thermal sensitive working area to zero, noise is greatly reduced, heat capacity is greatly reduced, thermal response time is shortened, and device performance is improved.

This invention relates to a biomass gasification system and method with dust removal function, including a gasifier, a burner, a raw material supply module, and a dust collection device. The raw material supply module is used to transport pulverized green waste or other biomass raw materials to the gasifier for gasification to generate biomass fuel gas. The inlet of the dust collection device is located near the outlet of the raw material supply module, and is used to extract dust entrained during the process of the raw material falling into the gasifier. The dust includes sawdust, glue fragments, and other lightweight combustible particles. The outlet of the dust collection device is connected to the oxygen supply path of the burner, and is used to introduce the dust into the burner to mix and burn with the biomass fuel gas. This invention, by constructing a closed-loop path of "dust extraction-reburning," can significantly reduce coking in the gasifier, improve gasification efficiency and burner temperature rise rate, achieve efficient recovery and utilization of dust energy, and enhance the overall operational stability and thermal output efficiency of the system.

The present invention discloses an enhanced air-heat deicing system and method for fan blades, which adds a second blower, a humidifier or a hydrogenator, a pressure gauge, and a humidity sensor to the air-heat deicing system for fan blades, the outlet of the second blower is connected to the outlet of the humidifier, and the second blower and the humidifier are electrically connected to the deicing hub control cabinet, the deicing hub control cabinet controls the actions of the second blower and the humidifier, and the deicing hub control cabinet collects the pressure value of the pressure gauge, the humidity value of the blade cavity, the operating state parameters of the second blower and the humidifier, and uploads them to the deicing main control cabinet and the remote monitoring center, the remote monitoring center issues an action instruction to the deicing main control cabinet according to the received pressure value of the pressure gauge, the humidity value of the blade cavity, the operating state parameters of the second blower and the humidifier, and the deicing main control cabinet transmits the action instruction to the pressurization control system and the humidification control system of the deicing hub control cabinet. The present invention can improve the air-heat deicing speed of fan blades.

The invention provides a micro-thermal on-chip acoustic wave phase modulator, which belongs to the technical field of signal processing and comprises a substrate, a piezoelectric film and a micro heater. Wherein the piezoelectric film is arranged on the substrate, and the piezoelectric film is a lithium niobate film, a lithium tantalate film, an aluminum nitride film, an aluminum scandium nitride film or a gallium nitride film; the micro heater is arranged on the piezoelectric film; a cavity is formed between the substrate and the piezoelectric film, and the projection of the micro heater on the substrate in the height direction is located in the cavity. According to the micro-thermal on-chip sound wave phase modulator, effective phase modulation of incident sound waves is achieved through the thermo-acoustic effect of the lithium niobate thin film, and it is ensured that the heating temperature can be well limited in a modulation area based on the good thermal isolation performance and the low thermal capacity of the suspended thin film device; the excitation power consumption of the acoustic wave phase modulator is effectively reduced, and the response speed of the acoustic wave phase modulator is increased.

The present invention provides a low-temperature furnace body and a low-temperature dry body temperature calibrator including the low-temperature furnace body, the furnace body includes a furnace core and a cooling fan, the cooling fan is placed below the furnace core, the furnace core includes a foam insulation body, a thermostatic block arranged inside the foam insulation body and integrally foamed, a heat equalizing block installed in the thermostatic block, and a radiator and a cooling plate fixed on both sides of the foam insulation body, one side of the cooling plate is in contact with the thermostatic block, and the other side is in contact with the hot end of the radiator. The cross section of the thermostatic block in the furnace body of the present invention is set to an hourglass shape with wide ends and narrow in the middle, so that the thermostatic block is light in weight, small in heat capacity, and more sensitive to temperature changes, and the size of the cooling plate is also large, and the heat dissipation effect is good; the low-temperature dry body temperature calibrator of the present invention adopts a modular design, the furnace body structure layout is reasonable, the structure is compact, and the independent two air duct sealing design improves the stability of the furnace body and the temperature measurement accuracy, and is suitable for the temperature measurement of low-temperature devices under test.

The application discloses a temperature control jig, which comprises a top plate, an intermediate layer and a bottom plate arranged in layers, wherein the top plate and the bottom plate are flat plate structures, a frame is arranged along the edge of the top plate, one side surface of the frame protrudes from the surface of the top plate, the top plate and the frame form a containing space for containing a display panel to be tested, a plurality of heat conduction columns are arranged on the side surface of the bottom plate away from the intermediate layer, and the intermediate layer is provided with a plurality of arrayed through holes, so that the cross section of the intermediate layer is a grid structure. The grid design of the intermediate layer of the temperature control jig greatly reduces the overall mass and heat capacity of the jig, so that heat can be more quickly conducted to the top plate through the bottom plate heat conduction columns, and the temperature rising and falling waiting time is shortened. Moreover, when the grid structure is heated and expanded, the through holes provide internal deformation space, effectively avoiding macro warping of the jig as a whole, and ensuring flat and close fitting of the panel and the jig during the test.

The invention provides a heating circulation system using hot compressed air as a heat transfer medium. The heating circulation system is formed by connecting a compressed air system, an air inlet pipeline, a box body air sleeve, an air return pipeline and a pressure balance tank. The compressed air system is composed of an air compressor, an oil radiator, an air filter and an electric control module, the oil radiator is communicated with an air inlet pipeline, the air inlet pipeline is communicated with a box body air sleeve, a box body is arranged in the box body air sleeve, and a space in a sterilizer box body of the box body is used for placing an object to be sterilized; the air return pipeline is communicated with the air return end of the box body air sleeve and communicated with the pressure balance tank. The circulating system is heated by hot compressed air generated by the air compressor, so that the ethylene oxide sterilizer can be sterilized and heated, a large amount of water can be saved, electricity for heating the water is saved, the sterilizing and heating process is shortened, and the heating efficiency is improved, so that the air sleeve and the pipeline can be made of common steel, and the cost is reduced. Manufacturing cost is greatly reduced, and service life of equipment is prolonged.

The invention provides a size precision control method for a heat-resistant stainless steel double-ring hollow gas turbine casing casting, and particularly relates to the field of gas turbine casing casting. The integrally-cast stainless steel double-ring hollow gas turbine casing is designed by combining a 3D printing heterogeneous composite core and a 3D heterogeneous composite core; according to the 3D printing heterogeneous composite core, zircon sand is adopted for the portion, with the high requirement for refractoriness, in a casing supporting plate, chromite sand is adopted for the portions, with the certain requirement for refractoriness, of an upper flange, a lower flange, an outer ring corner and an inner cavity corner, 3D printing resin sand is adopted for the other portions with the low requirement for refractoriness, and the design of the 3D printing heterogeneous composite core is achieved. According to the 3D printing heterogeneous composite core, when a 3D printing composite core process is designed, topological gridding structure design is adopted, a binding agent is sprayed into a sand layer on the surface of a sand mold and a gridding framework, and the binding agent is not sprayed into a space gridding of the sand mold. And high-dimensional precision control casting of the stainless steel double-ring hollow gas turbine casing casting can be realized.

The utility model discloses a device for quickly taking out a spectrum sample from a launder, which comprises an aluminum silicate fiber plug for containing a high-temperature solution in the launder and a support mechanism for bearing the aluminum silicate fiber plug, and the aluminum silicate fiber plug sleeves one end of the support mechanism. And an operating part for operating the supporting mechanism is arranged at the other end of the supporting mechanism. The device for rapidly taking out the spectrum sample from the launder has the advantages of being low in cost and easy to operate, and can meet the high requirements of a production line for timely sampling, rapid inspection and timely adjustment of components of a melt in an electric furnace.

The present invention discloses a boiler exhaust gas purification device and a method for using the same, and relates to the field of boiler exhaust gas purification, including a refrigeration device and a desulfurization tower, wherein the refrigeration device is used to cool the exhaust gas, a pressure relief port is fixedly installed on the top of the refrigeration device, a water inlet is fixedly installed on the bottom of the refrigeration device, and the desulfurization tower is used to purify the exhaust gas. The cold air generated by the refrigeration device of the present invention will enter the first docking pipeline through the second docking pipeline and mix with the exhaust gas, and the exhaust gas after the temperature reduction treatment will enter the air delivery pipeline, and the contact pipeline is arranged at the rear end of the first docking pipeline, and contacts with the exhaust gas after the refrigeration treatment, so as to ensure the accuracy of the control of the refrigeration device, and the entire refrigeration process is transferred and arranged before the desulfurization treatment, which can directly avoid the problem of excessive temperature during the desulfurization process, and will not affect the desulfurization process.

A preheating unit and a clinical chemistry analyzer. The preheating unit (PH) (100) comprises a heater (101), a PH body (102), a tubular flow path (103), a heat conductor (104) and a cover (105). The PH body (102) is heated by a heater (101). A tubular flow path (103) is arranged in the groove (102a) and allows liquid flow. The groove (102a) is formed by extending in the axial direction with respect to the outer peripheral surface (102b). The heat conductor (104) comprises a metal member covering the outer peripheral surface (102b) and the tubular flow path (103). The cover includes an elastic member covering the heat conductor (104), and the elastic member has a lower thermal conductivity than the heat conductor (104).

The invention relates to a sensing cell array device and a forming method thereof. The sensing unit array device comprises at least two heat insulation cavities formed between a substrate and an insulating layer, at least two gas sensing units which are respectively formed corresponding to the heat insulation cavities and are arranged in an array, and an interconnection structure, the interconnection structure comprises a plurality of metal interconnection lines and a plurality of shared connection pads which are respectively connected with the metal interconnection lines, each metal interconnection line connects the first heating terminals, the second heating terminals, the first test terminals or the second test terminals in the at least two gas sensing units to the corresponding shared connection pads, so that the circuit can be simplified, the number of the connection pads can be reduced, the structure of the sensing unit array device can be optimized, and the manufacturing cost can be reduced.

The invention relates to a fluid transient temperature sensor based on the FP principle, and belongs to the field of optical temperature sensing. One axial end of the 99 corundum ceramic tube is lapped on the 316 stainless steel metal seat, and the optical fiber collimator is coaxially arranged in an inner cavity of the end of the 99 corundum ceramic tube; the 99 corundum adapter is in butt joint with the other axial end of the 99 corundum ceramic tube; the transparent reflector plate is vertically arranged in an inner cavity of the 99 corundum adapter, and the transparent reflector plate is axially perpendicular to the 99 corundum ceramic tube; the fluid holes are evenly formed in the outer wall of the 99 corundum adapter in the circumferential direction, and the positions of the fluid holes correspond to the positions of the transparent reflection pieces. One end, extending out of the 99 corundum ceramic tube, of the optical fiber collimator is connected with the circulator through a cable; the circulator is respectively connected with the broadband light source and the demodulation terminal through optical fibers; the temperature resistance degree and the temperature measurement upper limit of the whole structure are improved, the service life is long, and the problem of service life attenuation does not exist under the conditions that external damage is avoided and the temperature sensing element is kept clean.

The utility model discloses a miniature visual vacuum furnace which comprises a furnace body assembly, a furnace cover assembly and a furnace plate assembly, the furnace body assembly comprises a furnace shell, a furnace cavity for placing the furnace plate assembly is arranged in the furnace shell, a lower glass assembly corresponding to the furnace plate assembly is embedded in the bottom wall of the furnace shell, an electrode and a thermocouple connector are arranged on the side wall of the furnace shell, and the thermocouple connector is matched with the furnace plate assembly in an abutting mode; the furnace plate assembly comprises a furnace plate support and a furnace plate placed on the furnace plate support, a heating rod connected with the electrode wire is arranged on the side wall of the furnace plate, and a sample plate is arranged in the furnace plate; a lower heat insulation pad is arranged between the stove plate bracket and the stove plate; the furnace cover assembly comprises a furnace body sealing cover and a furnace cover seat embedded in the middle of the furnace body sealing cover, the furnace body sealing cover and the furnace shell are fixed in a matched mode through a fastener, an upper glass assembly is arranged on the furnace cover seat corresponding to the sample disc, an upper heat insulation pad is arranged between the furnace cover seat and the furnace disc, and the upper heat insulation pad is fixed to the bottom of the furnace cover seat. The vacuum environment and the high-heat-resistance furnace plate support are adopted for heat insulation, and the temperature control range can be obviously widened.

The present invention discloses a flame-retardant B1-class cable, the cable having a cable core mainly composed of a plurality of insulated conductors, the cable core being coated with an inner ceramic fiber tape layer, an oxygen-isolating layer, an outer ceramic fiber tape layer and a sheath layer in sequence from the inside to the outside, and a ceramic fiber cotton filling layer being filled in the combined gap of the cable core coated with the inner ceramic fiber tape layer. The present invention forms a multi-layer protection for the insulated conductors of the cable core through such a structural arrangement to prevent the flame from burning inside the cable core, and at the same time, can prevent external heat from being conducted to the insulated conductors of the cable core to the greatest extent, and has the characteristics of good fireproofing and fireproofing performance and excellent flame retardant effect.

The utility model discloses an electrolyte tank with exhaust structure belongs to electrolyte tank technical field, including electrolyte tank body, electrolyte tank body installs inside water resistance cabinet, and the top of electrolyte tank body is fixedly connected with exhaust pipe through, fixedly connected with sealing valve between exhaust pipe, the lateral surface of electrolyte tank body is connected with the liquid supplementing pipe through, and the top of liquid supplementing pipe is thread sealingly connected with sealing cover. Through reducing the volume of electrolyte tank body, the unit volume heat dissipation area increases, reduces the heat capacity simultaneously, and the both sides of electrolyte tank body are provided with the radiating fin simultaneously, further improve the heat dissipation area of electrolyte tank body, thereby improve the heat dissipation performance of this electrolyte tank body, play good cooling effect, avoid the evaporation too fast, concentration out of control, electrode corrosion acceleration and insulation piece flashover hidden danger caused by high temperature.

The utility model discloses a massager with a heatable massage head, which relates to the technical field of massagers and comprises a shell, an eccentric wheel, a heating device and a heating device. The driving part is used for driving the eccentric wheel to rotate; the massage head is located on the eccentric wheel, and the center line of the massage head and the center line of the output end of the driving piece are staggered. When massage is needed, the part, needing to be massaged, of the human body is attached to the massage head, the driving piece is started to drive the eccentric wheel to rotate, the heating plate and the carbon brush block are driven to rotate together, and the massage head can be heated. The carbon brush plate conducts electricity to the heating plate through the carbon brush block, so that the massage head is heated, compared with heating through a heating piece, the mode is rapid in heat conduction, uniform in temperature distribution, small in heat capacity, rapid in temperature rising and lowering and high in temperature control precision, the user experience is improved, meanwhile, when the eccentric wheel rotates, the eccentric wheel drives the massage head to eccentrically rotate, the human body is massaged, and the massage effect is good. Therefore, the massage and hot compress area is increased.

The utility model discloses a long-acting antibacterial mildew-proof white cardboard which comprises a white cardboard main body, the white cardboard main body is composed of a bottom paper layer, a middle layer and a top paper layer, the bottom paper layer is arranged on one side of the middle layer, and the top paper layer is arranged on the other side of the middle layer; the backing paper layer is composed of an antibacterial layer and a corrosion-resistant layer; the middle layer is composed of a flexible layer and an elastic layer; the top paper layer is composed of a wear-resistant layer and a waterproof layer. The wear-resistant and water-proof fabric has the properties of bacteriostasis, antibiosis, corrosion resistance, flexibility and elasticity, and is wear-resistant and water-proof at the same time.

The utility model discloses an exhaled air condensate integrated collecting device, which relates to the technical field of exhaled air condensate collection and comprises a refrigerating mechanism, a collecting mechanism and a control mechanism. The condensate collection assembly comprises a collection pipe, a cryopreservation pipe, a gas-liquid separation cover and a gas blowing pipe assembly; the gas-liquid separation cover covers a pipe orifice at the top end of the collecting pipe; the top end pipe orifice of the cryopreservation pipe is detachably connected and communicated with the bottom end pipe orifice of the collection pipe; one end of the air blowing pipe assembly penetrates through the air-liquid separation cover and is inserted into the collecting pipe to input exhaled air; when exhaled air condensate is collected, the collecting pipe is detachably inserted into the cooling inserting hole, so that exhaled air entering the collecting pipe is condensed and liquefied. The exhaled air condensate can be smoothly extracted and transferred, and the risk of being polluted is reduced.

The utility model discloses a temperature measuring probe and a temperature measuring instrument. The temperature measuring probe comprises a probe body, a probe head and a temperature sensor, the probe body is connected with the probe head, the probe head is made of a tin alloy material with the melting point larger than or equal to 100 DEG C, the probe head is provided with the temperature sensor, and the temperature sensor is used for detecting the temperature of the probe head. The temperature measuring instrument comprises the temperature measuring probe. According to the probe, the tin alloy is small in heat capacity and high in heat conductivity coefficient, and the detection sensitivity and accuracy can be guaranteed; the tin alloy material is relatively soft and easy to process, and as the detection temperature rises, the tin alloy deforms to a certain extent microcosmically, so that the tin alloy can be better attached to the inner wall of the detected reactor; the tin alloy with the melting point larger than or equal to 100 DEG C is adopted, the probe cannot be molten in a reactor during temperature measurement, residues cannot be generated when the probe is pulled out, and use is convenient.

The invention provides a light diesel engine tail gas after-treatment system and a control method thereof, which can solve the problems of high cold start emission, catalyst poisoning caused by HC, N2O generation and difficulty in reaching the standard of PN10 emission in the prior art, meet the requirements of a new generation of emission regulations, and improve the emission efficiency. Comprising a ccDOC unit, a first urea injection unit, a ccSCR unit, a DPF unit, a second urea injection unit, a second SCR unit and an ASC unit which are sequentially arranged in the tail gas direction of an engine. The controller is electrically connected with the first urea spraying unit and the second urea spraying unit; and the controller controls the first urea injection unit to inject a first urea amount U1 into the tail gas in front of the ccSCR unit and controls the second urea injection unit to inject a second urea amount U2 into the tail gas in front of the second SCR unit according to a preset control method.