An opacity monitor (10) including a light source (12) mounted on one side of a duct (14), and a detector (16) mounted on the opposite side of the duct is disclosed. The light source (12) and the detector (16) are rotated by motor means (26, 36), respectively, between a first position aligned with each other along an open light path defined across the duct (14) and a second position aligned with each other on opposite sides of a calibration tube (18) extending across the duct (14). Shutters (28, ...

A paraffin monitor includes a pulse source periodically providing pulses. Apparatus, adapted to be immersed in a medium having paraffin, provides an output signal in response to each pulse in accordance with a paraffin film grown on said apparatus while the apparatus is immersed in the medium.

A monitor circuit for indicating the change of state of one of a plurality of signalizing switching elements, each switching element controlling according to its state the state of an electronic switch, said electronic switches controlling indicating means.

The monitoring device is self-contained, compact and is preferably strapped about the wrist over the region where a radial pulse is normally detected. Heart rate and abnormalities in the heart beat rate are sensed by the device. Because no external connections are necessary to a power source, for example, the device is particularly useful for ambulatory patients suffering from various types of heart ailments. A pressure sensitive diaphragm sensor is held against the skin over the radial pulse re...

A respiration monitor comprising a sensing unit which senses the expansion and contraction of the chest, abdomen, side or back; and through the electrical system sounds an alarm if this motion ceases. The respiration motion is changed to an electrical signal in the transducer. Two points on the skin surface are selected as reference points and the relative motion of the two points is monitored by a light modulation method. A small transducer is mounted on the skin at the first reference point. A...

An optical monitor in which liquid to be analyzed flows through a light transparent cell. First means passes a light beam of selected bandwidth through the cell, the beam being attenuated to an extent dependent upon the light absorption characteristic of the liquid. A photocell device is responsive to the attenuated beam, the resistance of the device varying with the amount of attenuation. An oscillator is coupled to the device to produce an attenuating signal, the signal frequency varying with ...

An instrument for monitoring ovulation including a dual electrode vaginal probe and monitoring device for indicating the magnitude and polarity of the electrochemical response of vaginal fluids with the electrodes. The instrument detects the biochemical change of vaginal fluids from an acidic oxidative response to the temporary reductive response occurring coincident with ovulation. This response can be utilized for an aid to contraception, as an aid to conception or to aid in determining the se...

An improved monitor for use in a catheterizing tube system has a hollow closed chamber, preferably resilient, containing test viewing means, for example, a transparent portion of the chamber, and urine testing means disposed within the chamber. The urine testing means includes a test medium which is visually responsive to a preselected urine factor to be tested. Urine transferring means, such as a needle, communicate between the chamber interior and the exterior. Catheter attaching means may be ...

Method and apparatus for the continuous, real-time measurement of the nitrogen dioxide (NO.sub.2) content of a gaseous atmosphere. A flowing or non-confined atmospheric sample is subjected to energizing radiation in the broad NO.sub.2 absorption spectrum, preferably between about 400 and 600 nm., with sufficient energy to excite the NO.sub.2 to its fluorescent state. A detector measures the fluorescence in the red band (about 620 nm. to 800 nm.) with lower wavelength radiation, including the exc...

Respiration is monitored by measuring a subject's impedance by impressing an oscillator-controlled constant current source upon the subject. The output is fed to a differential amplifier, bandpass filtered, and full wave rectified. The differential amplifier can be switched to be fed by separate electrodes on the subject and not connected to the constant current source.