Output correction system for analog sensor
First Claim
1. An analog output test and correction system for an analog detector which outputs an analog signal having a varying value representative of the value of a detectable variable physical quantity monitored and detected by the detector, the detector having means for developing a test and sensing signal for sensing and detecting the physical quantity and having means responsive to the test and sensing signal for developing as a function of the value of the physical quantity the analog output signal representative of the physical quantity, the test and correction system comprising, a control section for receiving the analog output of the detector under a condition where the output is representative of a condition where the physical quantity is at zero value and an output from the analog detector under a simulated condition in which the value of the physical quantity is a simulated predetermined value at which the detector detects the physical quantity, said control section having a first arithmetic section for calculating a gradient of values on the basis of the output under the zero value condition and the output under the simulated condition, a storage section for storing said zero value condition output and said gradient of values, and a second arithmetic section for calculating a value of the physical quantity corresponding to the predetermined output value from the analog detector on the basis of the detector output characteristics defined by said zero value condition outputs and said gradient of values of outputs, and means including means in said control section for adjustably correcting and maintaining said test and sensing signal at a level effective to maintain the detector output corresponding to the simulated condition even if said characteristics of the detector change, whereby the detector detects the physical quantity when said predetermined value thereof obtains even if the detector characteristics change.
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Abstract
This invention is directed to an output correction system for an analog sensor which outputs an analog signal corresponding to a quantity of state. The output correction system for the analog sensor comprises a control section which receives an output from the analog sensor obtained under condition where the quantity of state is zero and an output from the analog sensor obtained under pseudo-condition equivalent to a certain quantity of state; a first arithmetic section for calculating a gradient on the basis of the output under the zero condition and the output under the pseudo-condition; a storage section for storing output characteristics defined by said gradient; and a second arithmetic section for calculating a quantity of state corresponding to the output from the analog sensor on the basis of the output characteristics defined by the gradient.
35 Citations
15 Claims
- 1. An analog output test and correction system for an analog detector which outputs an analog signal having a varying value representative of the value of a detectable variable physical quantity monitored and detected by the detector, the detector having means for developing a test and sensing signal for sensing and detecting the physical quantity and having means responsive to the test and sensing signal for developing as a function of the value of the physical quantity the analog output signal representative of the physical quantity, the test and correction system comprising, a control section for receiving the analog output of the detector under a condition where the output is representative of a condition where the physical quantity is at zero value and an output from the analog detector under a simulated condition in which the value of the physical quantity is a simulated predetermined value at which the detector detects the physical quantity, said control section having a first arithmetic section for calculating a gradient of values on the basis of the output under the zero value condition and the output under the simulated condition, a storage section for storing said zero value condition output and said gradient of values, and a second arithmetic section for calculating a value of the physical quantity corresponding to the predetermined output value from the analog detector on the basis of the detector output characteristics defined by said zero value condition outputs and said gradient of values of outputs, and means including means in said control section for adjustably correcting and maintaining said test and sensing signal at a level effective to maintain the detector output corresponding to the simulated condition even if said characteristics of the detector change, whereby the detector detects the physical quantity when said predetermined value thereof obtains even if the detector characteristics change.
Specification
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- Resources
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Current AssigneeHochiki Kabushiki Kaisha
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Original AssigneeHochiki Corporation
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InventorsKikuchi, Masamichi, Matsuoka, Naoya, Yuchi, Sadataka, Machida, Haruchika
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Primary Examiner(s)Lall, Parshotam S.
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Assistant Examiner(s)Ramirez, Ellis B.
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Application NumberUS06/854,937Time in Patent Office1,497 DaysField of Search340/511, 340/825.06, 340/825.1, 340/825.11, 364/571, 364/571.01, 364/571.02, 364/571.05, 364/571.08, 364/571.06, 364/573, 364/577, 73/1 RUS Class Current702/87CPC Class CodesG08B 17/107 for detecting light-scatter...G08B 17/113 Constructional detailsG08B 29/24 Self-calibration, e.g. comp...G08B 29/28 by changing the gain of an ...
