초록 ▼

A drop detecting system has light emitting diodes and phototransistors located on either side of a translucent drip chamber. The phototransistors respond to either the shadow or the reflection from a drop falling through a light beam produced by the light emitting diodes. The electrical response fro

A drop detecting system has light emitting diodes and phototransistors located on either side of a translucent drip chamber. The phototransistors respond to either the shadow or the reflection from a drop falling through a light beam produced by the light emitting diodes. The electrical response from the phototransistors is conducted to an integrator circuit which generates an electrical signal voltage. A comparator circuit receives the electrical signal voltage from the integrator circuit and outputs a signal indicating the presence of a drop passing through the drip chamber. A drip chamber housing cooperates with the drip chamber to shroud the translucent portion of the drip chamber. Additionally the drip chamber housing provides for the mounting of the light emitting diodes and the phototransistors.

대표청구항 ▼

A system for detecting the occurrence of drops of falling fluid under different ambient light conditions, comprising: (a) a drip chamber through which said drops fall in a substantially straight path; (b) light emission means, located in said chamber on one side of said path, for producing a beam of

A system for detecting the occurrence of drops of falling fluid under different ambient light conditions, comprising: (a) a drip chamber through which said drops fall in a substantially straight path; (b) light emission means, located in said chamber on one side of said path, for producing a beam of light adapted to intersect said path; (c) light responsive means, located in said chamber on another side of said path, for receiving said beam; and (d) circuit means, coupled to said light responsive means, causing production of a first signal of one polarity when said beam is intercepted by one of said drops under a first ambient light condition, and causing production of a second signal of opposite polarity by reflecting ambient light off of one of said drops and onto said light responsive means under a second ambient light condition characterized by more ambient light than said first condition, whereby said first signal is indicative of the occurrence of one of said falling drops under said first condition, and said second signal is indicative of the occurrence of one of said falling drops under said second condition.