Data collection system
AssigneeToshiba Mitsubishi-Electric Industrial Systems Corporation
InventorNoriyuki MAEHATA
Life of this patent
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Abstract
A data collection system includes sensors which are synchronized with each other and an optical signal distributor, wherein each of the sensors comprises a first delay unit which delays a second electrical signal for a first delay time set such that a sum of the first delay time and a first conversion time is same in all of the sensors, and the optical signal distributor comprises second delay units each of which delays a first electrical signal for a second delay time set such that all of sums of the second delay times and conversion times are same as each other.
Claims6
A data collection system comprising:
- a plurality of sensors which are synchronized with each other;
- and
- an optical signal distributor, wherein
- each of the sensors comprises:
- a physical quantity measurement unit which measures a physical quantity;
- a first optical signal transmission unit which transmits a first optical signal to the optical signal distributor when the measured physical quantity satisfies a predetermined condition;
- a first signal converter which converts a second optical signal received from the optical signal distributor into a second electrical signal;
- a first delay unit which delays the second electrical signal obtained by the first signal converter for a first delay time set such that a sum of the first delay time and a first conversion time by the first signal converter is same in all of the sensors;
- and
- a data transmission unit which transmits the physical quantity measured at a time the condition is satisfied when the physical quantity satisfies the condition, and transmits the physical quantity measured a predetermined time before a receipt time of the second electrical signal when the data transmission unit receives the second electrical signal delayed by the first delay unit, and
- the optical signal distributor comprises:
- a plurality of second signal converters which convert the first optical signals output from the sensors into first electrical signals, respectively;
- a plurality of second delay units each of which delays the first electrical signal obtained by the corresponding second signal converter for a second delay time set such that all of sums of the second delay times and conversion times by the second signal converters are same as each other;
- and
- a second optical signal transmission unit which transmits the second optical signal to the first signal converter of each of the sensors when the second optical signal transmission unit receives the delayed first electrical signal from at least one of the second delay units.
A data collection method using a plurality of sensors which are synchronized with each other and an optical signal distributor, wherein
- each of the sensors is configured to:
- measure a physical quantity;
- transmit a first optical signal to the optical signal distributor when the measured physical quantity satisfies a predetermined condition;
- convert a second optical signal received from the optical signal distributor into a second electrical signal;
- delay the obtained second electrical signal for a first delay time set such that a sum of the first delay time and a conversion time for conversion into the second electrical signal is same in all of the sensors;
- and
- transmit the physical quantity measured at a time the condition is satisfied when the physical quantity satisfies the condition, and transmit the physical quantity measured a predetermined time before a receipt time of the second electrical signal when the delayed second electrical signal is received, and
- the optical signal distributor is configured to:
- convert the first optical signal output from each of the sensors into a first electrical signal;
- delay the obtained first electrical signal for a second delay time set such that all of sums of the second delay times and conversion times for conversion into the first electrical signals are same as each other;
- and
- transmit the second optical signal to each of the sensors when the at least one delayed first electrical signal is received.
Dependencies are inferred from the claim text.