Device for counting ions

FIELD: physics, instrumentation technology.

SUBSTANCE: invention relates to measurement technology and can be used to measure ion concentration of atmospheric air. In the device for counting ions, comprising an aspiration chamber, the high-voltage electrode of which is connected to a high-voltage power source, and the collecting electrode, through a switch controlled by the signal of a control device, is connected to the input of the output device, and a display device, the novelty lies in that it further includes series-connected band-pass filter, analogue signal rectifier and low-pass filter, the output of which is connected to the input of the display device, and the input of the band-pass filter is connected to the output of the input device.

EFFECT: invention provides high accuracy of measuring ion concentration by reducing the impact of interference.

2 dwg

 



 

Same patents:

FIELD: physics.

SUBSTANCE: apparatus has an aspirating chamber with a power supply, switches, a processing device and a display device, a control device for transmitting an arithmetic shift signal to the display device, an integrator, a voltage comparator and two circuits, each consisting of series-connected capacitor and switch and each of the circuits is connected in parallel to the capacitor of the integrator in the processing device, wherein capacitance of the capacitor in the first circuit is n times greater than that of the capacitor of the integrator of the processing device, and capacitance of the capacitor in the second circuit is n times greater than the sum of capacitances of the integrator and the capacitor in the first circuit, wherein the base of the number system used in the display device is equal to (n+1). The first input of the comparator is connected to the output of the processing device, the second input is connected to a reference voltage source, and its output is connected to the control device, whose additional outputs control the state of the switches.

EFFECT: wider range of measuring concentration of ions.

2 cl, 4 dwg

FIELD: physics.

SUBSTANCE: in the method of measuring ion concentration, involving charge accumulation on the capacitor of an aspiration chamber when ions of the analysed gas settle on its collecting electrode over a given period of time and subsequent measurement thereof by detecting a pulse arising at the output of the input device during discharge of the capacitor of the aspiration chamber on its input resistance, based on whose parameters ion concentration is determined, wherein ion concentration is determined from the integral value of that pulse, the novelty lies in that ion concentration is determined from the integral value of that pulse at the moment in time when the magnitude of the pulse satisfies the expression: n |f(tu) | = |ecm| + |Iin| R, where n is the measured ion concentration, f(t) is a function which determines the shape of the pulse at the input of the processing device with unit ion concentration, ecm is bias voltage of the integrator in the processing device, lin is the input current of the integrator in the processing device, R is the resistance in the time constant of the integrator in the processing device, tu is the time for detecting the integral of the pulse arising at the output of the input device during discharge of the capacitor of the aspiration chamber. In the apparatus for measuring ion concentration, having an aspiration chamber with a high-voltage power supply, series-connected switch, input device, processing device and indicating device, as well as a control device whose first output is connected to the processing device, the second output is connected to the switch which connects the collecting electrode of the aspiration chamber with the input device, the novelty lies in that it further includes a voltage comparator, the output signal trailing edge of which determines the time for measuring voltage across the output of the processing device using the indicating device, the first input of the comparator is connected to the input of the processing device, the second input is connected to a reference voltage source, the sign of the output voltage - Uon of which matches that of the voltage across the input of the processing device, and its magnitude is determined by the expression: |Uon| = |ecm| + |Iin| R, and the output of the comparator is connected to the second input of the indicating device.

EFFECT: high accuracy of measuring ion concentration by reducing measurement error caused by bias voltage and input current of the processing device.

2 cl, 7 dwg

FIELD: instrumentation engineering.

SUBSTANCE: proposed volume ionization chamber designed for use in X-ray equipment for medicine to diagnose patient's organs, for inspecting engineering processes, and for monitoring environment and can operate at dose rates as low as 10-6 to 10-2 R/min has sealed housing, first and second electrodes made in the form of material characterized in low and high atomic numbers Zlow and Zhigh, respectively, secured on opposite inner surfaces of housing to face one another in ionizing radiation flux; chamber has no external power supply and is provided with insulating gasket of thickness h = 0.05 - 0.2 mm made in the form of stepwise alternating strips, step width being equal to that of strip; this gasket is disposed between electrode and contacts their mating surfaces; chamber also has operational amplifier whose inputs are coupled with respective electrodes; chamber space and openings between gaskets are intercommunicating and are filled with distilled water.

EFFECT: enhanced precision and sensitivity, reduced cost.

1 cl, 2 dwg

FIELD: measuring equipment, applicable for measurement of concentration of aeroions.

SUBSTANCE: the method consists in accumulation of a charge on the vessel of the aspiration chamber at settlement of ions of the gas under investigation on its collecting electrode for the preset time period, and subsequent measurement of it by way of registration of the pulse arising at the output of the input device at a discharge of the vessel of the aspiration chamber, the concentration of ions is determined by the value of the integral of this pulse.

EFFECT: enhanced accuracy of measurement due to the use of the new method for measurement of concentration of ions, at which the result of measurement does not depend on the capacity of the aspiration chamber.

2 dwg

FIELD: measuring engineering.

SUBSTANCE: device comprises recording unit, housing of the aspiration ionization chamber provided with the inlet insulated device for sucking the ionized composition of gas, measuring device mounted in the housing, and fan. The housing receives a deflecting capacitor. The back wall of the aspiration ionization chamber is made of an insulating material and is undulant and perforated. The measuring device is made of measuring capacitors whose first plates are rectangular perforated electrodes mounted in the hollows of the undulant back wall. The second plates of the capacitors are set in the crests of the undulant back wall. The measuring capacitors and recording device are divided into three sections. The left section is used for recording negatively charged ions, the central section is used for recording total ionization, and the right section is used for recording positively charged ions.

EFFECT: expanded functional capabilities.

2 dwg

FIELD: measuring engineering.

SUBSTANCE: device comprises recording unit, housing of the aspiration ionization chamber provided with the inlet insulated device for sucking the ionized composition of gas, measuring device mounted in the housing, and fan. The housing receives a deflecting capacitor. The back wall of the aspiration ionization chamber is made of an insulating material and is undulant and perforated. The measuring device is made of measuring capacitors whose first plates are rectangular perforated electrodes mounted in the hollows of the undulant back wall. The second plates of the capacitors are set in the crests of the undulant back wall. The measuring capacitors and recording device are divided into three sections. The left section is used for recording negatively charged ions, the central section is used for recording total ionization, and the right section is used for recording positively charged ions.

EFFECT: expanded functional capabilities.

2 dwg

FIELD: measuring equipment, applicable for measurement of concentration of aeroions.

SUBSTANCE: the method consists in accumulation of a charge on the vessel of the aspiration chamber at settlement of ions of the gas under investigation on its collecting electrode for the preset time period, and subsequent measurement of it by way of registration of the pulse arising at the output of the input device at a discharge of the vessel of the aspiration chamber, the concentration of ions is determined by the value of the integral of this pulse.

EFFECT: enhanced accuracy of measurement due to the use of the new method for measurement of concentration of ions, at which the result of measurement does not depend on the capacity of the aspiration chamber.

2 dwg

FIELD: instrumentation engineering.

SUBSTANCE: proposed volume ionization chamber designed for use in X-ray equipment for medicine to diagnose patient's organs, for inspecting engineering processes, and for monitoring environment and can operate at dose rates as low as 10-6 to 10-2 R/min has sealed housing, first and second electrodes made in the form of material characterized in low and high atomic numbers Zlow and Zhigh, respectively, secured on opposite inner surfaces of housing to face one another in ionizing radiation flux; chamber has no external power supply and is provided with insulating gasket of thickness h = 0.05 - 0.2 mm made in the form of stepwise alternating strips, step width being equal to that of strip; this gasket is disposed between electrode and contacts their mating surfaces; chamber also has operational amplifier whose inputs are coupled with respective electrodes; chamber space and openings between gaskets are intercommunicating and are filled with distilled water.

EFFECT: enhanced precision and sensitivity, reduced cost.

1 cl, 2 dwg

FIELD: physics.

SUBSTANCE: in the method of measuring ion concentration, involving charge accumulation on the capacitor of an aspiration chamber when ions of the analysed gas settle on its collecting electrode over a given period of time and subsequent measurement thereof by detecting a pulse arising at the output of the input device during discharge of the capacitor of the aspiration chamber on its input resistance, based on whose parameters ion concentration is determined, wherein ion concentration is determined from the integral value of that pulse, the novelty lies in that ion concentration is determined from the integral value of that pulse at the moment in time when the magnitude of the pulse satisfies the expression: n |f(tu) | = |ecm| + |Iin| R, where n is the measured ion concentration, f(t) is a function which determines the shape of the pulse at the input of the processing device with unit ion concentration, ecm is bias voltage of the integrator in the processing device, lin is the input current of the integrator in the processing device, R is the resistance in the time constant of the integrator in the processing device, tu is the time for detecting the integral of the pulse arising at the output of the input device during discharge of the capacitor of the aspiration chamber. In the apparatus for measuring ion concentration, having an aspiration chamber with a high-voltage power supply, series-connected switch, input device, processing device and indicating device, as well as a control device whose first output is connected to the processing device, the second output is connected to the switch which connects the collecting electrode of the aspiration chamber with the input device, the novelty lies in that it further includes a voltage comparator, the output signal trailing edge of which determines the time for measuring voltage across the output of the processing device using the indicating device, the first input of the comparator is connected to the input of the processing device, the second input is connected to a reference voltage source, the sign of the output voltage - Uon of which matches that of the voltage across the input of the processing device, and its magnitude is determined by the expression: |Uon| = |ecm| + |Iin| R, and the output of the comparator is connected to the second input of the indicating device.

EFFECT: high accuracy of measuring ion concentration by reducing measurement error caused by bias voltage and input current of the processing device.

2 cl, 7 dwg

FIELD: physics.

SUBSTANCE: apparatus has an aspirating chamber with a power supply, switches, a processing device and a display device, a control device for transmitting an arithmetic shift signal to the display device, an integrator, a voltage comparator and two circuits, each consisting of series-connected capacitor and switch and each of the circuits is connected in parallel to the capacitor of the integrator in the processing device, wherein capacitance of the capacitor in the first circuit is n times greater than that of the capacitor of the integrator of the processing device, and capacitance of the capacitor in the second circuit is n times greater than the sum of capacitances of the integrator and the capacitor in the first circuit, wherein the base of the number system used in the display device is equal to (n+1). The first input of the comparator is connected to the output of the processing device, the second input is connected to a reference voltage source, and its output is connected to the control device, whose additional outputs control the state of the switches.

EFFECT: wider range of measuring concentration of ions.

2 cl, 4 dwg

FIELD: measuring equipment.

SUBSTANCE: invention relates to measurement equipment and can be used for measuring ion concentration of atmospheric air. Method of measuring ion concentration, which comprises periodic charge accumulation on a capacitor of an aspiration chamber with settling of ions of investigated air on its collecting electrode at equal time intervals and subsquent measurement thereof by measuring pulse parameters occurring at input of input device during discharge of capacitor of aspiration chamber at its input resistance when switch is closed, connecting collecting electrode of chamber to input of input device, measuring amplitude of first harmonic of sequence of said pulses and determining concentration of ions from value of amplitude of first harmonic of sequence of said pulses.

EFFECT: high accuracy of measuring ion concentration by reducing effect of noise.

1 cl, 2 dwg

FIELD: physics, instrumentation technology.

SUBSTANCE: invention relates to measurement technology and can be used to measure ion concentration of atmospheric air. In the device for counting ions, comprising an aspiration chamber, the high-voltage electrode of which is connected to a high-voltage power source, and the collecting electrode, through a switch controlled by the signal of a control device, is connected to the input of the output device, and a display device, the novelty lies in that it further includes series-connected band-pass filter, analogue signal rectifier and low-pass filter, the output of which is connected to the input of the display device, and the input of the band-pass filter is connected to the output of the input device.

EFFECT: invention provides high accuracy of measuring ion concentration by reducing the impact of interference.

2 dwg

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