US3793630A — Pyrometer with digitalized linearizing correction

Claim 1

Independent Claim 374 words

A pyrometer having digitalized linearizing correction, comprising: dual slope integration circuitry including: a first input for receiving the analog signal of variable temperature measurements, a second input for receiving a fixed reference signal, switching means having two sequential switch conditions for alternate coupling to said first and second inputs and said switching means having output circuitry at which appears, at any instant of time, only one of said input signals, integrating means having an input coupled to said output circuitry and an output at which appears a first ramp signal of a first polarity having a variable slope depending upon the variable temperature measurements and a second ramp signal of opposite polarity defined by said fixed reference input and having a fixed slope, coaction of said switching means and said integrating means causing said first and second ramp signals to bE generated sequentially and to lie entirely between a first predetermined level and a variable second level; clock pulse generating means for supplying a train of clock pulses; pulse counting means having an input, a plurality of discrete numeric outputs and readout outputs; linearizing circuitry connected to receive said train of clock pulses and said numeric outputs and having an output coupled to said input of said pulse counting means, said linearizing circuitry being interconnected for response to said discrete outputs for inhibiting the passage of numerically selected ones of said clock pulses to said pulse counting means; and control means having inputs coupled for response alternately to a predetermined pulse count value and to the output from said integrating means when it is at said first predetermined level, said control means having outputs connected to said switching means for initiating the first ramp signal when the output from said integrating means is at said first level, for terminating the first said ramp signal at the time of said predetermined pulse count value, at which time it is at said second level, for commencing the second ramp signal at that time and for terminating the second ramp signal when said first level is reobtained; the output from said control means which is responsive to said first level also being coupled to said pulse counting means for strobing the digit value therein for readout purposes.

Claim 2

Dependent Claim 374 words

A pyrometer having digitalized linearizing correction, comprising: dual slope integration circuitry including: a first input for receiving the analog signal of variable temperature measurements, a second input for receiving a fixed reference signal, switching means having two sequential switch conditions for alternate coupling to said first and second inputs and said switching means having output circuitry at which appears, at any instant of time, only one of said input signals, integrating means having an input coupled to said output circuitry and an output at which appears a first ramp signal of a first polarity having a variable slope depending upon the variable temperature measurements and a second ramp signal of opposite polarity defined by said fixed reference input and having a fixed slope, coaction of said switching means and said integrating means causing said first and second ramp signals to bE generated sequentially and to lie entirely between a first predetermined level and a variable second level; clock pulse generating means for supplying a train of clock pulses; pulse counting means having an input, a plurality of discrete numeric outputs and readout outputs; linearizing circuitry connected to receive said train of clock pulses and said numeric outputs and having an output coupled to said input of said pulse counting means, said linearizing circuitry being interconnected for response to said discrete outputs for inhibiting the passage of numerically selected ones of said clock pulses to said pulse counting means; and control means having inputs coupled for response alternately to a predetermined pulse count value and to the output from said integrating means when it is at said first predetermined level, said control means having outputs connected to said switching means for initiating the first ramp signal when the output from said integrating means is at said first level, for terminating the first said ramp signal at the time of said predetermined pulse count value, at which time it is at said second level, for commencing the second ramp signal at that time and for terminating the second ramp signal when said first level is reobtained; the output from said control means which is responsive to said first level also being coupled to said pulse counting means for strobing the digit value therein for readout purposes.

Claim 3

Dependent Claim 61 words

A pyrometer according to claim 1 in which said control means includes coincidence gating means having an one input a signal responsive to said first predetermined level, and a relaxation oscillator providing a relatively slow train of pulses for a second input to said gating means and eliciting therefrom a strobe pulse for the readout purposes of said pulse counting means.

Claim 4

Dependent Claim 47 words

A pyrometer according to claim 1 in which said control means includes reset means coupled for response to the reobtaining of said first level and having outputs connected to said pulse counting means and said linearizing circuitry for resetting same upon the reobtaining of said first level.

Claim 5

Dependent Claim 90 words

A pyrometer according to claim 1 in which said switching means comprises a pair of parallel connected paths with one such path being connected to receive the analog signal value and the other path connected to receive the fixed reference, said other path including a variable impedance for preadjusting the value of said fixed reference, as seen by said integrating means, for fine tuning said first ramp signal for digitalized matching with the output from the clock pulse generator, such that each count pulse represents one degree of measured temperature.

Claim 6

Dependent Claim 61 words

A pyrometer according to claim 1 in which said pulse counting means comprises BCD counting means, pulse count latching means responsive to a strobing signal from the output of said control means for latching the count in the BCD counting means at the time of the strobe signal, and decoding and digitalized readout means for display of the latched pulse count.

Claim 7

Dependent Claim 66 words

A pyrometer according to claim 1 in which said integrating circuit has at its output circuit means for increasing its slewing rate, whereby the termination of said second ramp signal is defined with considerable precision, said circuit means comprising a detector of said first predetermined level and series coupled to the output thereof a slide back detector for increasing the slewing rate of said level detector.

Claim 8

Dependent Claim 79 words

A pyrometer according to claim 6 in which said slide back detector comprises a programmable unijunction element having its gate as the input of said detector, a capacitor connected to the output of said unijunction element and in parallel with its cathode, and means coupling the output of said slide back detector to an input of said control means when the gate, at the beginning of the slewing, is forced below the anode to short circuit said unijunction element.

Claim 9

Dependent Claim 84 words

A pyrometer according to claim 1 in which said analog signal iS derived from a J type thermocouple, said discrete numeric outputs generate a coaction within said linearizing circuitry for defining a response range for a J type thermocouple and for generating a plurality of periodic clock pulse suppression signals within that response range, whereby said output of said linearizing circuitry transmits to said pulse counting means a train of pulses linearized with respect to the variable temperature measurements of a J type thermocouple.

Claim 10

Dependent Claim 44 words

A pyrometer according to claim 8 in which said pulse counting means is arranged to operate in a BCD mode and the linearizing circuitry is intercoupled to respond to the inputs of even units, eight units, and odd tens for defining the suppression signals.

Claim 11

Dependent Claim 57 words

A pyrometer according to claim 8 in which said switching means includes a pair of parallel paths one of which is arranged to receive the fixed reference signal and includes a variable impedance for fine tuning said first ramp signal such that each count pulse during the first ramp signal precisely represents one degree of measured temperature.

Claim 12

Dependent Claim 85 words

A pyrometer according to claim 1 in which said linearizing circuitry comprises logic gating means connected to receive at least most of said plurality of discrete numeric outputs for defining at least a first range of pulse counts and for generating a first plurality of periodically repeating clock pulse suppression signals in said first range, said suppression signals being gated with said train clock pulses at said output of said linearizing circuitry for passing to said pulse counting means all but the suppressed clock pulses.

Claim 13

Dependent Claim 41 words

A pyrometer according to claim 11 in which at least one of said discrete numeric outputs defines a second range of pulse counts and said logic gating means is interconnected for generating a second periodically repeating plurality of pulse suppression signals.

Claim 14

Dependent Claim 47 words

A pyrometer according to claim 12 in which said logic gating means is interconnected such that said second plurality of suppression signals includes all of said first plurality and is greater in number, whereby more clock pulses are periodically suppressed during said second range of pulse counts.

Claim 15

Dependent Claim 57 words

A pyrometer according to claim 11 in which said logic gating means includes an input means for receiving at least one of said discrete numeric outputs for defining another range of pulse counts and said logic gating means is interconnected for response to the other range of pulses for inhibiting the generating of any pulse suppression signals.

Claim 16

Dependent Claim 53 words

A pyrometer according to claim 11 in which said logic gating means includes bistable means coupled to said output of said linearizing circuitry and responsive to said train of clock pulses and said suppression signals for enabling said output to pass a clock pulse subsequent to the suppression of a preceeding clock pulse.

Claim 17

Dependent Claim 198 words

A pyrometer having digitalized linearizing correction, comprising: dual slope integration circuitry including: input means for receiving separately the analog signal of variable temperature measurements and a fixed reference signal, integrating means coupled to said input means and having an output at which appear sequentially a first and second ramp signals of opposite polarity representing the reference and temperature input signals, respectively; clock pulse generating means for supplying a train of clock pulses; pulse counting means having an input and a plurality of discrete numeric outputs; linearizing circuitry connected to receive said train of clock pulses and said numeric outputs and having an output coupled to said input of said pulse counting means, said linearizing circuitry including logic gating means interconnected for response to said discrete outputs for generating a plurality of periodically repeating clock pulse suppression signals for inhibiting the passage of numerically selected ones of said clock pulses to said pulse counting means; and control means coupled for response to a predetermined pulse couNt value from said pulse counting means and to the output from said integrating means when it is at a first predetermined level for sequentially initiating and terminating said first and second ramp signals.

Claim 18

Dependent Claim 198 words

A pyrometer having digitalized linearizing correction, comprising: dual slope integration circuitry including: input means for receiving separately the analog signal of variable temperature measurements and a fixed reference signal, integrating means coupled to said input means and having an output at which appear sequentially a first and second ramp signals of opposite polarity representing the reference and temperature input signals, respectively; clock pulse generating means for supplying a train of clock pulses; pulse counting means having an input and a plurality of discrete numeric outputs; linearizing circuitry connected to receive said train of clock pulses and said numeric outputs and having an output coupled to said input of said pulse counting means, said linearizing circuitry including logic gating means interconnected for response to said discrete outputs for generating a plurality of periodically repeating clock pulse suppression signals for inhibiting the passage of numerically selected ones of said clock pulses to said pulse counting means; and control means coupled for response to a predetermined pulse couNt value from said pulse counting means and to the output from said integrating means when it is at a first predetermined level for sequentially initiating and terminating said first and second ramp signals.

Claim 19

Dependent Claim 82 words

A pyrometer according to claim 16 in which said input means comprises a pair of paths connected in parallel, one of which includes a variable impedance for fine tuning one of said ramp signals for digitalized matching with the output from the clock pulse generator, such that each count pulse represents one degree of measured temperature, said input means being constructed and arranged such that said variable impedance has no significant influence upon the analog signal as seen by said integrating means.

Claim 20

Dependent Claim 36 words

A pyrometer according to claim 17 in which said integrating means has at its output means for detecting said first predetermined level and a slide back detector for increasing the slewing rate of said level detector.

Claim 21

Dependent Claim 46 words

A pyrometer according to claim 16 in which said logic gating means is interconnected for different responses to said discrete numeric output for defining a plurality of different pulse count response ranges and different generating rates for said clock pulse suppression signals for each said range.

Claim 22

Dependent Claim 80 words

A pyrometer according to claim 16 in which said input means includes a pair of parallel connected switches controlled by said control means such that said predetermined pulse count value is accumulated for the entire duration of said first ramp signal, which thereby terminates at a second level variable proportionately with respect to the temperature measurements, and said control means is arranged to effect a strobing of said pulse counting means when said second ramp signal attains said first level.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-02-18	1977-08-20	1978-02-19	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-02-18	1981-08-20	1982-02-19	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-02-18	1985-08-20	1986-02-19	$7700.00	Window Closed / Lapsed

Pyrometer with digitalized linearizing correction

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