Various embodiments of an oil monitoring apparatus are provided. In one embodiment, an oil monitoring apparatus includes a probe and an analyzing module in-line connected to the probe. The probe includes: a first sensor for measuring respective optical intensities of a light passing through the oil
Various embodiments of an oil monitoring apparatus are provided. In one embodiment, an oil monitoring apparatus includes a probe and an analyzing module in-line connected to the probe. The probe includes: a first sensor for measuring respective optical intensities of a light passing through the oil at respective red, green and blue wavelength ranges; a second sensor for measuring a water content; and a third sensor for measuring a temperature of the oil. The analyzing module calculates and monitors chemical deterioration of the oil, total contamination of the oil, a relative saturation of the oil by water and temperature of the oil based on the output signals of the first and third sensors. The oil monitoring apparatus monitors various parameters relating to the deterioration of the oil and to the physical properties of the oil.
대표청구항▼
1. An oil monitoring apparatus, comprising: a housing mounted to a member containing oil therein so as to be in contact therewith;a first sensor mounted to the housing, the first sensor including: an optical passing element with an interface in contact with the oil;a light-emitting means for emittin
1. An oil monitoring apparatus, comprising: a housing mounted to a member containing oil therein so as to be in contact therewith;a first sensor mounted to the housing, the first sensor including: an optical passing element with an interface in contact with the oil;a light-emitting means for emitting a light to the optical passing element; anda color-sensing means for measuring respective optical intensities at respective red, green and blue wavelength ranges of a light passing through the oil via the optical passing element and the interface and for outputting respective signals;a second sensor mounted to the housing for measuring water content of the oil and outputting a signal;a third sensor mounted to the housing for measuring temperature of the oil and outputting a signal; anda control unit including a processor, the processor being configured to calculate a ratio value and a variation value from the respective signals outputted from the color-sensing means, the ratio value being defined by a ratio of an optical intensity at the red wavelength range to an optical intensity at the green wavelength range, the variation value being defined by variations in optical intensity at the respective red, green and blue wavelength ranges between an initial condition and a current condition of the oil, the processor being configured to further calculate a relative saturation of the oil by water from the output signals of the second sensor and a temperature value of the oil from the output signals of the third sensor, the processor being configured to monitor the ratio value, the variation value, the relative saturation and the temperature value. 2. The oil monitoring apparatus of claim 1, wherein the optical passing element comprises first and second optical windows spaced apart from and faced to each other;wherein the light-emitting means contacts a back face of the tlrst first optical window that is disposed opposite a face of the first optical window, the first optical window being disposed to face the second optical window; andwherein the color-sensing means contacts a back face of the second optical window that is disposed opposite a face of the second optical window, the second optical window being disposed to face the first optical window. 3. The oil monitoring apparatus of claim 1, wherein the optical passing element comprises a cylindrical body having a refractive index higher than that of the oil, the light being incident on and outgoing from one end of the cylindrical body, the cylindrical body having a light-reflection member at an opposite end thereof; andwherein the first sensor further includes a first optical fiber for interconnecting one end of the light-emitting means and the one end of the cylindrical body and a second optical fiber for interconnecting one end of the color-sensing means and the one end of the cylindrical body. 4. The oil monitoring apparatus of claim 3, wherein the housing includes a hollow portion having through-holes for flowing in and out of the oil therethrough; andwherein the cylindrical body is fixed to one wall of the hollow portion at the one end thereof and to an opposite wall of the hollow portion at the opposite end thereof. 5. The oil monitoring apparatus of claim 1, wherein the optical passing element comprises a polyhedral body having a refractive index higher than that of the oil, the polyhedral body having a light-incident face through which a light is incident and a light-outgoing face through which a light outgoes; andwherein the light-emitting means is positioned such that an optical axis of an emitted light is normal to the light-incident face and the color-sensing means is positioned such that an optical axis of a received light is normal to the light-outgoing face. 6. The oil monitoring apparatus of claim 3 or 5, wherein the processor is configured to normalize a plurality of output signals of the optical intensities at the green and blue wavelength ranges to a depth by which a light at the red wavelength range penetrates from the optical passing element to the oil; andwherein the processor is configured to calculate the ratio value, the variation value of the optical intensity at the green wavelength range, and the variation value of the optical intensity at the blue wavelength range. 7. The oil monitoring apparatus of claim 5, wherein the light-incident face and the light-outgoing face are chamfered off so as to satisfy a condition of total internal reflection. 8. The oil monitoring apparatus of claim 1, wherein the apparatus further comprises a sensor monitoring unit, the sensor monitoring unit including: an optical radiation measuring means disposed adjacent to the light-emitting means for measuring an optical radiation of the light-emitting means and outputting signals; anda current driver for adjusting a current fed to the light-emitting means; and wherein the processor is configured to control the current driver based on the output signals of the optical radiation measuring means. 9. The oil monitoring apparatus of claim 1, wherein the apparatus further comprises a signal calibrating unit, the signal calibrating unit including: an amplifier for amplifying and transmitting the signals of the color-sensing means to the processor; anda feedback regulator controlled by the processor for adjusting the signals of the color-sensing means transmitted by the amplifier;wherein the control unit further includes a gain amplifier for adjusting a gain of the output signals of the amplifier; andwherein the processor is configured to compare the output signal of the amplifier with a preset minimal critical value and a preset maximal critical value, to increase and decrease the gain of the gain amplifier when the output signal of the amplifier exceeds the minimal critical value and the maximal critical value, and to calculate the ratio value and the variation value when the output signal of the amplifier is between the minimal critical value and the maximal critical value. 10. The oil monitoring apparatus of claim 1, further comprising a display unit controlled by the processor for displaying the ratio value, the variation value, the relative saturation and the temperature value. 11. The oil monitoring apparatus of claim 1, further comprising a communication unit including an interface for communication between the processor and a host computer. 12. An oil monitoring apparatus, comprising: a probe including: a housing mounted to a member containing oil therein so as to be in contact therewith;a first sensor mounted to the housing for measuring optical intensities of a light passing through the oil and outputting signals;a second sensor mounted to the housing for measuring a water content of the oil and outputting a signal; anda third sensor mounted to the housing for measuring a temperature of the oil and outputting a signal; andan analyzing module in-line connected to one of the first sensor, the second sensor, the third sensor, or any combination thereof, for analyzing conditions of the oil; wherein the first sensor includes: an optical passing element with an interface in contact with the oil;a light-emitting means for emitting a light to the optical passing element; anda color-sensing means for measuring respective optical intensities at respective red, green and blue wavelength ranges of a light passing through the oil via the optical passing element and the interface and outputting respective signals; andwherein the analyzing module comprises a control unit including a processor configured to calculate the output signals of the first, second and third sensors,wherein the processor is configured to calculate a first parameter and a second parameter from the output signals of the first sensor, a third parameter from the output signals of the second sensor and a fourth parameter from the output signals of a fourth sensor, the first parameter being defined by a ratio value of an output at the red wavelength range to an output at the green wavelength range, the second parameter being defined by a variation value in optical intensity at the respective red, green and blue wavelength ranges between an initial condition and a current condition of the oil, the third parameter being defined by a relative saturation of the oil by water, the fourth parameter being defined by a temperature of the oil,wherein the processor is configured to compare the first to fourth parameters with respective threshold values thereof. 13. The oil monitoring apparatus of claim 12, wherein the optical passing element comprises first and second optical windows spaced apart from and faced to each other; wherein the light-emitting means contacts a back face of the first optical window that is disposed opposite a face of the first optical window, the first optical window being disposed to face the second optical window; and wherein the color-sensing means contacts a back face of the second optical window that is disposed opposite a face of the second optical window, the second optical window being disposed to face the first optical window. 14. The oil monitoring apparatus of claim 12, wherein the housing includes a hollow portion having through-holes for flowing in and out of the oil therethrough; wherein the optical passing element comprises a cylindrical body having a refractive index higher than that of the oil, the light being incident on and outgoing from one end of the cylindrical body, the cylindrical body having a light-reflection member at an opposite end thereof;wherein the cylindrical body is fixed to one wall of the hollow portion at the one end thereof and to an opposite wall of the hollow portion at the opposite end thereof; andwherein the first sensor further includes a first optical fiber for interconnecting one end of the light-emitting means and the one end of the cylindrical body and a second optical fiber for interconnecting one end of the color-sensing means and the one end of the cylindrical body. 15. The oil monitoring apparatus of claim 12, wherein the optical passing element comprises a polyhedral body having a refractive index higher than that of the oil, the polyhedral body having a light-incident face through which a light is incident and a light-outgoing face through which a light outgoes;wherein the light-incident face and the light-outgoing face are chamfered off so as to satisfy a condition of total internal reflection; andwherein the light-emitting means is positioned such that an optical axis of an emitted light is normal to the light-incident face and the color-sensing means is positioned such that an optical axis of a received light is normal to the light-outgoing face. 16. The oil monitoring apparatus of claim 14 or 15, wherein the processor is configured to normalize a plurality of output signals of the optical intensities at the green and blue wavelength ranges to a depth by which a light at the red wavelength range penetrates from the optical passing element to the oil; andwherein the processor is configured to calculate the first and second parameters. 17. The oil monitoring apparatus of claim 12, wherein the analyzing module further comprises a sensor monitoring unit, the sensor monitoring unit including: an optical radiation measuring means disposed adjacent to the light-emitting means for measuring an optical radiation of the light-emitting means and outputting signals; anda current driver for adjusting a current fed to the light-emitting means; and wherein the processor is configured to control the current driver based on the output signals of the optical radiation measuring means. 18. The oil monitoring apparatus of claim 12, wherein the analyzing module further comprises a signal calibrating unit, the signal calibrating unit including: an amplifier for amplifying and transmitting the signals of the color-sensing means to the processor; anda feedback regulator controlled by the processor for adjusting the signals of the color-sensing means transmitted by the amplifier;wherein the control unit further includes a gain amplifier for adjusting a gain of the output signals of the amplifier; andwherein the processor is configured to compare the output signal of the amplifier with a preset minimal critical value and a preset maximal critical value, to increase and decrease the gain of the gain amplifier when the output signal of the amplifier exceeds the minimal critical value and the maximal critical value, and to calculate the ratio value and the variation value when the output signal of the amplifier is between the minimal critical value and the maximal critical value. 19. The oil monitoring apparatus of claim 12, wherein the analyzing module further comprises a display unit controlled by the processor for displaying the first to fourth parameters. 20. The oil monitoring apparatus of claim 1 or 12, wherein the light-emitting means includes one of a RGB LED and a white LED. 21. The oil monitoring apparatus of claim 1 or 12, wherein the color-sensing means includes a color sensor. 22. The oil monitoring apparatus of claim 1 or 12, wherein the second sensor includes an air humidity sensor with an oleophobic material coated on a surface brought into contact with the oil.
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