Data logger

Abstract

Multiple identical data loggers are produced on sheet material and then separated to produce individual products for distribution to separate locations. A continuous roll of tape sheet material comprises a contiguous series of data loggers which each include a cover sheet, a transponder, a sensor, a power source (such as a battery), an antenna, a microprocessor, an adhesive layer and means to separate individual data logger elements from one another.

Description

BACKGROUND OF THE INVENTION

The invention finds application in the field of environmental monitoring and recording and relates to semi-active and active radio frequency information device data loggers, such as RFID tags. Tags are applied to or incorporated within a product, animal or person for identification and tracking with radio waves. Tags can be detected and read from beyond line of sight by an RFID reader device. To control manufacturing costs and for ease of dispensing and use it is desirable to produce individual data loggers on a sheet material matrix such as an elongated continuous roll of tape backing. RFID tags contain an integrated circuit for detecting, processing and storing data, which is modulated and demodulated as a radio frequency signal and conveyed by an antenna. Some tags are self-powered by a battery. Passive tags have no battery power supply and require external power. Battery assisted passive tags require a power source to become active, but have no significant higher forward link capability for greater read range. It is known to make individual separate data loggers by a costly time consuming method. Individual modules are used separately for recording and storage of measurement data for subsequent harvesting and use.

It is desirable to sense, measure, transmit and record features of a product during transport and storage. Process variables, such as temperature, pressure, strain, resistance, voltage, humidity all influence consumer products. Such products include flowers, food, and pharmaceuticals. Multiple loggers are used in arrays and radio frequency connection avoids wiring installation cost and reduces maintenance cost.

SUMMARY OF THE INVENTION

Identical data logger units are produced on a sheet material matrix such as a roll of tape and are then separated from the support matrix for individual disposition and use. Individual loggers are separated by tearing on a pre-weakened seam or perforation, or are mounted to be peeled away from the matrix or from a grid, which is then disposed of or reused. Individual and separate loggers include a protective cover layer, adhesive backing a bar coded label and a write upon window area.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a cartoon picture of a roll of data loggers mounted with a tape support.

FIG. 2 is a diagram showing the elements of data loggers on the tape roll.

FIG. 3 is a block circuit diagram of the data logger elements connected as in operation of the product. Seven components are seen connected by lines. A power source converter is illustrated for use with an external power supply source.

DETAILED DESCRIPTION OF THE INVENTION

A first embodiment of the invention is seen in FIG. 1, which allows a user to remove individual loggers from a continuous tape matrix roll. The roll construction (1) allows separation of individual loggers (2) from the matrix and thereafter to be mounted on a measurement surface for detecting and recording environment features, such as temperature.

Another embodiment is seen in FIG. 2, which shows detailed construction features of a roll of RFID loggers. Cover labels and an insulation protective layer are peeled back to reveal internal construction of a single removable section. Cover label (1) is placed on an insulation layer (2), which in turn is on top of a flexible printed circuit board (3). The circuit board comprises a micro processor (4), a power supply (such as a battery)(5), a sensor (6) and an antenna (7). Attached to a surface of the circuit board is an adhesive layer, such as peel away release tape (8). The composite article of manufacture comprises a high temperature backing to be removed to expose the tape segment for attachment to a measurement surface.

Claims

1. An article of manufacture comprising a sheet material having a plurality of separate radio frequency data loggers mounted thereupon as discreet units which each comprise a sensor, a transmitter, an antenna and a power means.

2. A method of manufacture of multiple data logger units which comprises forming separate loggers on a sheet of support material and thereafter separating individual units and fastening them on a surface to detect and measure variable physical parameters.

3. A roll or spool of flexible sheet material tape incorporating individual separable data logger units with means for fastening said units onto a measurement site.