Circuit for generating sync pulses for use in detecting output signals of spectrophotometer or the like

Claim 2

A circuit for generating sync pulses for use in detecting the output signals of a measuring instrument such as a double-beam spectrophotometer using a chopper which is rotated in response to the electrical signal, said circuit comprising: i. means (PG, Di-1) adapted to generate a first clock pulse (b) in synchronism with said electrical signal, ii. means adapted to generate one pulse (h) whose pulse duration equals that of said first clock pulse for each revolution of said chopper (c), iii. shift registers (SR1-SR4) for receiving said pulse (h), and having a number of outputs capable of being shifted to the following stages during one rotation of said chopper (c); and iv. means adapted to select and synthesize the outputs of said shift registers (SR1-SR4) contained in the components (R,S,O) of said output signal (a) of said measuring instrument which components are to be separated from each other.

Claim 3

A circuit as defined in claim 1, wherein said means adapted to generate one pulse per revolution of said chopper (c) comprises: i. a first differentiator (X) adapted to differentiate the leading edge of said first clock pulse; ii. a second differentiator (X'') adapted to diffentiate the trailing edge of said first clock pulse; iii. means adapted to generate one pulse (Ch) per revolution of said chopper; iv. a first flip-flop circuit for receiving said pulse (Ch) and the output of one of said first or second differentiators (X or X''); v. a second flip-flop circuit for receiving the output (Ch) of said means and the output of the other of said differentiators (X'' or X); and vi. an EXCLUSIVE-OR gate for receiving the outputs of said first and second flip-flops.

Claim 4

A circuit as defined in claim 1, wherein said means adapted to select and synthesize the output of said shift registers comprises: a plurality of logic addition circuits (OR) whose number equals the number of said components of said output signal to be separated from each other.

Claim 5

A circuit for generating sync pulse for use in detecting the output signal of a measuring instrument such as a single-beam spectrophotometer using a chopper (c) which is driven by the electrical signal, said circuit comprising: i. means adapted to generate a first clock pulse (b) in synchronism with said electrical signal for driving said chopper (c); ii. means adapted to generate one pulse (h) whose pulse duration equals that of said first clock pulse for each revolution of said chopper (c); iii. shift registers (SR1-SR2) for receiving said pulse (h), and having a number of outputs capable of being shifted to the following stages during one rotation of said chopper (c) and which uses a second clock pulse (i) in synchronism with said first clock pulse; iv. a logic addition circuit (NOR) to which are applied the output pulses (OUT1, OUT2) of said shift registers which are generated first and positioned most closely to the leading and trailing edges of said output pulse of said measuring instrument; v. means (M.M.) adapted to synchronize the pulse component of said output of said logic addition circuit which is positioned most closely to said leading edge with said leAding edge of said output pulse signal of said measuring instrument and also adapted to synchronize the pulse component of said output of said logic addition circuit which is positioned most closely to said trailing edge with said trailing edge of said pulse signal of said instrument; vi. means (OUT3, OUT4, NOR, NOR, NOR, NOR) adapted to generate, in response to the output of said synchronizing means (v), a first signal (n) whose leading edge is synchronized with that of said output pulse signal of said instrument and a second signal (p) whose leading edge if synchronized with the trailing edge of said output pulse signal of said instrument; and vii. a R-S flip-flop (RSF) to which are applied said first and second signals.

Claim 6

A circuit for generating sync pulse for use in detecting the output signal of a measuring instrument such as a single-beam spectrophotometer using a chopper (c) which is driven by the electrical signal, said circuit comprising: i. means adapted to generate a first clock pulse (b) in synchronism with said electrical signal for driving said chopper (c); ii. means adapted to generate one pulse (h) whose pulse duration equals that of said first clock pulse for each revolution of said chopper (c); iii. shift registers (SR1-SR2) for receiving said pulse (h), and having a number of outputs capable of being shifted to the following stages during one rotation of said chopper (c) and which uses a second clock pulse (i) in synchronism with said first clock pulse; iv. a logic addition circuit (NOR) to which are applied the output pulses (OUT1, OUT2) of said shift registers which are generated first and positioned most closely to the leading and trailing edges of said output pulse of said measuring instrument; v. means (M.M.) adapted to synchronize the pulse component of said output of said logic addition circuit which is positioned most closely to said leading edge with said leAding edge of said output pulse signal of said measuring instrument and also adapted to synchronize the pulse component of said output of said logic addition circuit which is positioned most closely to said trailing edge with said trailing edge of said pulse signal of said instrument; vi. means (OUT3, OUT4, NOR, NOR, NOR, NOR) adapted to generate, in response to the output of said synchronizing means (v), a first signal (n) whose leading edge is synchronized with that of said output pulse signal of said instrument and a second signal (p) whose leading edge if synchronized with the trailing edge of said output pulse signal of said instrument; and vii. a R-S flip-flop (RSF) to which are applied said first and second signals.

Claim 7

A circuit as defined in claim 4, wherein means adapted to generate one pulse per revolution of said chopper comprises: i. a first differentiator (X) adapted to differentiate the leading edge of said first clock pulse; ii. a second differentiator (X'') adapted to differentiate the trailing edge of said first clock pulse; iii. means adapted to generate one pulse per revolution of said chopper, iv. a first flip-flop (F4) for receiving said pulse (Ch) generated whenever said chopper completes one revolution and the output of one of said first and second differentiators (X, X''); v. a second flip-flop (F5) for receiving said pulse generated whenever said chopper completes one revolution and the output of the other differentiator; and vi. an EXCLUSIVE-OR gate for receiving the outputs of said first and second flip-flops.