Abstract:
PURPOSE: A sensor for measuring hydrogen ion concentration having a temperature sensor and an apparatus for measuring hydrogen ion concentration having the sensor are provided to easily use the sensor and reduce the size of the sensor by detecting temperature as well as hydrogen ion concentration. CONSTITUTION: An apparatus for measuring hydrogen ion concentration includes a sensor measuring hydrogen ion concentration having a temperature sensor(28); an amplifier(34) amplifying the hydrogen ion concentration measured by the sensor; a collective amplifier(36) collecting the amplified hydrogen ion concentration value for amplifying; a differential amplifier(42) directly connected to the temperature sensor for receiving an actual temperature value detected by the temperature sensor and receiving the temperature value through a detecting circuit(32), so that the differential amplifier differentiates and amplifies each temperature value; a CPU(38) calculating and outputting the corrected hydrogen ion concentration value and the temperature value by using the amplified hydrogen ion concentration value and the temperature value; and a display(40) visually providing the output value output from the CPU.
Abstract:
PURPOSE: An MEMS pH sensor having an Ag/AgCl electrode structure and a method for manufacturing the same are provided to expand life span of the MEMS pH sensor by minimizing loss of an Ag/AgCl electrode in KCl solution. CONSTITUTION: A pair of Ag layers including solvent and powder are obtained by silk printing Ag paste on a silicon wafer(22). After removing a solvent component from the Ag layers, a powder component of the Ag layers is cured, thereby obtaining a pair of cured Ag layers. Then, the cured Ag layers are subject to an electrolysis process in such a manner that an AgCl layer is formed on an upper surface of the Ag electrode, thereby forming a pair of Ag/AgCl electrodes. The Ag/AgCl electrodes are formed on a reference electrode(14) and a detection electrode(16) of the MEMS pH sensor.
Abstract:
PURPOSE: A micro valve for controlling a nano flow rate and a pH sensor reference electrode by using the same are provided to improve detecting characteristics of the pH sensor reference electrode by using a shape memory alloy thin film. CONSTITUTION: A micro valve(26) includes a silicon wafer(24), an insulation layer(13), DLC layers(14,14'), a chamber(18), carbon nano tubes(16,16'), an SMA thin film(17), and electrodes(19,19'). The silicon wafer(24) has a cavity section(11) which is opened towards an opening of a reference electrode(30). The insulation layer(13) is formed on the silicon wafer(24) and has a perforated slot having a predetermined length and a width. The chamber(18) is surrounded by the insulation layer(13) and the DLC layers(14,14'). The SMA layer(17) receives electric energy from the electrodes(19,19').
Abstract:
PURPOSE: A method for forming a liquid junction potential film of a micro pH sensor is provided to prevent a buffer solution filled in a reference electrode from evaporating, extend the life span of the micro pH sensor, and improve the stability of the micro pH sensor. CONSTITUTION: In a micro pH sensor(20) including a silicon wafer(21), a reference electrode(22) formed on the silicon wafer, a buffer solution(23) filled in an etching part(27) of the silicon wafer, an acryl(28) accumulated to surround the etching part, an epoxy(24) accumulated on the acryl, a method for forming a liquid junction potential film(25) of the micro pH sensor includes the steps of doping a through part(26) of the etching part of the silicon wafer in p type, fixing the silicon wafer at a partition of an electrolytic cell to contact one side of the silicon wafer to an HF solution and the other side of the silicon wafer to an electrolyte, and electrifying the positive pole and the negative pole in the solution, so that an electric field is generated and fine pores grow gradually in the silicon area doped in p type of the silicon wafer.
Abstract:
PURPOSE: A temperature measuring apparatus for an electric power line is provided to directly measure a temperature variation of a conductive wire from a remote place by measuring a color variation of a thermal-sensitive tape using optical fiber, a color filter and a photo transistor. CONSTITUTION: A thermal-sensitive tape(206) is attached to a surface of a bonding part(204) formed between first and second conductive wires(200a,200b). A protective cover(202) is provided to protect the first and second conductive wires(200a,200b). Optical fiber(208) passes through the protective cover(202). One end of optical fiber(208) is opposite to the thermal-sensitive tape(206) and the other end of optical fiber(210) is coupled to a connector(214). A color filter section(212) includes red, green and blue filters, which are connected to a photo transistor(216). A color signal generated from the photo transistor(216) is amplified by means of a signal amplifier(218) and is converted into a digital signal by an A/D converter(220). The A/D converter(220) is connected to a signal processing device(222).
Abstract:
PURPOSE: A sensor measuring hydrogen ion concentration and dissolved oxygen and an apparatus for measuring the same using the sensor are provided to easily handle and use the apparatus for measuring by simultaneously measuring hydrogen ion concentration and dissolved oxygen with a micro sensor. CONSTITUTION: A sensor measuring hydrogen ion concentration and dissolved oxygen includes a base formed with a silicon wafer and having a measurement groove(12) for measuring hydrogen ion concentration, a reference groove(14), a dissolved oxygen sensor part; a measurement electrode(16) formed at the surface of the measurement groove measuring excited voltage of a solution to be measure; a reference electrode(18) attached to the surface of the reference groove; a detecting electrode(26) attached to the dissolved oxygen sensor part; a sensing membrane(20) formed at the lower hole of the measurement groove to be contacted with the solution; a transmissive film(22) formed at the lower hole of the reference groove to be contacted with the solution; a wall member attached to around each groove and the sensor part to secure a space for filling the solution in each groove and the sensor part; and a sealing member preventing the filled solution from leaking out or evaporating.
Abstract:
PURPOSE: An apparatus for measuring hydrogen ion concentration having an automatic calibration function is provided to accurately measure hydrogen ion concentration by automatically calibrating an output of a detector sensor related to a standard solution. CONSTITUTION: An apparatus for measuring hydrogen ion concentration having an automatic calibration function includes a reference sensor(30) sealed in a reference solution for obtaining an output voltage of the reference solution, a measurement sensor(40) settled in a solution to be measured for obtaining an output voltage of the solution, a differential amplifier(50) automatically calibrating a change variable by subtracting the voltage value obtained from the reference sensor from the voltage value obtained from the measurement sensor to amplify a pure output voltage to be measured, a buffering filter(60) filtering the output voltage value output from the differential amplifier, a gain amplifier(70) collecting and amplifying the output voltage value filtered from the buffering filter, an analog/digital converter(80) converting the analog output voltage value into the digital output voltage value, and a CPU(90) automatically processing the converted output voltage value.
Abstract:
PURPOSE: A method for forming a liquid junction potential film of a micro pH sensor is provided to prevent a buffer solution filled in a reference electrode from evaporating, extend the life span of the micro pH sensor, and improve the stability of the micro pH sensor. CONSTITUTION: In a micro pH sensor(20) including a silicon wafer(21), a reference electrode(22) formed on the silicon wafer, a buffer solution(23) filled in an etching part(27) of the silicon wafer, an acryl(28) accumulated to surround the etching part, an epoxy(24) accumulated on the acryl, a method for forming a liquid junction potential film(25) of the micro pH sensor includes the steps of doping a through part(26) of the etching part of the silicon wafer in p type, fixing the silicon wafer at a partition of an electrolytic cell to contact one side of the silicon wafer to an HF solution and the other side of the silicon wafer to an electrolyte, and electrifying the positive pole and the negative pole in the solution, so that an electric field is generated and fine pores grow gradually in the silicon area doped in p type of the silicon wafer.
Abstract:
PURPOSE: An electroplating method capable of uniformly distributing the amount of the anode to be exhausted by removing a deviation in current density through the electric field of a plating electrode is provided, which eliminates waste of resources and anxiety of a short circuit. CONSTITUTION: In an electroplating method by disposing the plating anode and cathode to be plated in a plating cell containing an electrolyte, this method comprises the steps of: calculating data related to a distance between the plating anode and cathode to be plated; controlling a distance at the lower part of the cathode to be plated and distance at the upper part; and plating by generating voltages to the cathode and anode to be plated.