The disclosed laser light pulse phase control device is provided with a laser, a reference comparator, a measurement comparator, a phase difference detector, and a loop filter.

A feature measure comparator (16) is configured to compare each determined feature measure (Tn, En, AEn ) to at least one corresponding predetermined feature interval.

A dial gauge (11) measures the travel of the coupling member (41).

A temperature measuring circuit (26) provides a temperature compensating signal to the comparator (24).

A threshold value is compared with a measurement signal by an analog or digital comparator.

The disclosed laser light pulse phase control device is provided with a laser, a reference comparator, a measurement comparator, a phase difference detector, and a loop filter.

In one embodiment, the measurement device employs a voltage comparator logic output circuit.

A system operable to monitoring bio/chemical activities includes a first measurement probe, a second measurement probe and a comparator.

A pulse width measuring circuit (5) outputs a signal depending on a pulse width, and the signal is then inputted to a comparator (6) and another comparator (7).

A measuring circuit (3, 25, 26) measures a drive stage electrical parameter such as supply voltage and a comparator (3) compares this with an acceptable value.

The comparator (60) measures the amplitude of an input signal against one of several threshold levels.

A rotor position detection device includes a first comparator (1), a second comparator (2), and a third comparator (3).

A feature measure comparator (16) is configured to compare each determined feature measure (Tn, En, AEn ) to at least one corresponding predetermined feature interval.

Systems and methods may include a comparator to compare the parameter measurement to a parameter set point.

The phase difference detector detects the phase difference between the output of the reference comparator and the output of the measurement comparator.