Analogue integration apparatus with compensation for drift

Claim 2

An analogue integration apparatus for integrating a primary signal with respect to time comprising: a. a primary signal network for generating a primary signal voltage and having second and first primary signal terminals connected to each other by a signal network resistor, b. a voltage-integrating network connected across said primary signal terminals and having an output voltage lead, c. a drift-compensating voltage source, for producing an electrical potential to offset drift developed in said voltageintegrating network, having a first compensating voltage lead connected to said second primary signal terminal, and having a second compensating voltage lead, d. an output amplifier system having an output amplifier with a command signal output lead terminating in a two-way switch, and a variable voltage source connected in series with said output amplifier between said first primary signal terminal and a three-way switch that is connectable to said output voltage lead, said first primary signal terminal, anD said second compensating voltage lead, e. a voltage-adjusting servomotor connectable to said two-way switch and connected to said first primary signal terminal and operably connected to said variable voltage source, whereby said variable voltage source is adjustable to effect a zero voltage input into said output amplifier, and f. a primary signal servomotor connected to said first primary signal terminal and connectable to said two-way switch and operably connected to said primary signal network, whereby said primary signal network is adjustable to effect a voltage differential between said second and first primary signal terminals equal and opposite in polarity to voltage at said drift-compensating voltage source.

Claim 3

The apparatus of claim 1 further characterized in that said voltage-integrating network is comprised of a resistor followed by an operational amplifier and a capacitor connected in parallel with each other, and a switch leading to ground connected to said resistor to bypass said operational amplifier and said capacitor.

Claim 4

The apparatus of claim 2 further characterized in that said drift-compensating voltage source is adjustable.

Claim 5

The apparatus of claim 1 further characterized in that said primary signal network is an electrical bridge having two branches, and said signal network resistor is connected to said second and first primary signal terminals between said branches of said bridge.

Claim 6

The apparatus of claim 1 further characterized in that an attenuation network is connected across said first primary signal lead and said output voltage lead, and a pen recorder is connected to said attenuation network and the integral with respect to time of voltage from said primary signal network is graphically recorded.

Claim 7

In an apparatus for quantitatively measuring the percentage of each component of a fluid stream by integrating a primary signal voltage with respect to time across an electrical bridge where said primary signal voltage is dependent upon the quantity present of each of the aforesaid components, the improvement comprising: a. a Wheatstone bridge for generating said primary signal voltage having second and first branches and second and first primary signal terminals in said second and first branches respectively, and a signal network resistor connecting said second and first primary signal terminals to each other, b. a voltage-integrating network connected across said primary signal terminals and having an output voltage lead, c. a drift-compensating voltage source, for producing an electrical potential to offset drift developed in said voltage-integrating network, having a first compensating voltage lead connected to said second primary signal terminal, and having a second compensating voltage lead, d. an output amplifier system having an output amplifier with a command signal output lead terminating in a two-way switch, and a variable voltage source connected in series with said output amplifier between said first primary signal terminal and a three-way switch that is connectable to said output voltage lead, said first primary signal terminal, and said second compensating voltage lead, e. a voltage-adjusting servomotor connectable to said two-way switch and connected to said first primary signal terminal and operably connected to said variable voltage source, whereby said variable voltage source is adjustable to effect a zero voltage input into said output amplifier, and f. a primary signal servomotor connected to said first primary signal terminal and connectable to said two-way switch and operably connected to said Wheatstone bridge, whereby said Wheatstone bridge is adjustable to effect a voltage differential between said second and first primary signal terminals equal and opposite in polarity to voltage at said drift-compensating voltage source.

Claim 8

In an apparatus for quantitatively measuring the percentage of each component of a fluid stream by integrating a primary signal voltage with respect to time across an electrical bridge where said primary signal voltage is dependent upon the quantity present of each of the aforesaid components, the improvement comprising: a. a Wheatstone bridge for generating said primary signal voltage having second and first branches and second and first primary signal terminals in said second and first branches respectively, and a signal network resistor connecting said second and first primary signal terminals to each other, b. a voltage-integrating network connected across said primary signal terminals and having an output voltage lead, c. a drift-compensating voltage source, for producing an electrical potential to offset drift developed in said voltage-integrating network, having a first compensating voltage lead connected to said second primary signal terminal, and having a second compensating voltage lead, d. an output amplifier system having an output amplifier with a command signal output lead terminating in a two-way switch, and a variable voltage source connected in series with said output amplifier between said first primary signal terminal and a three-way switch that is connectable to said output voltage lead, said first primary signal terminal, and said second compensating voltage lead, e. a voltage-adjusting servomotor connectable to said two-way switch and connected to said first primary signal terminal and operably connected to said variable voltage source, whereby said variable voltage source is adjustable to effect a zero voltage input into said output amplifier, and f. a primary signal servomotor connected to said first primary signal terminal and connectable to said two-way switch and operably connected to said Wheatstone bridge, whereby said Wheatstone bridge is adjustable to effect a voltage differential between said second and first primary signal terminals equal and opposite in polarity to voltage at said drift-compensating voltage source.

Claim 9

The apparatus of claim 6 further characterized in that said voltage-integrating network is comprised of a resistor followed by an operAtional amplifier and a capacitor, connected in parallel to each other, and a switch leading to ground connected to said resistor to bypass said operational amplifier and said capacitor.

Claim 10

The apparatus of claim 6 further characterized in that said drift-compensating voltage source is adjustable.

Claim 11

The apparatus of claim 6 further characterized in that an attenuation network is connected across said first primary signal lead and said output voltage lead, and a pen recorder is connected to said attenuation network, whereby the integral with respect to time of voltage from said primary signal network is graphically recorded.