Abstract:
Ensemble (N, M) de photodétecteurs pyroélectriques à film mince fabriqué comme une tranche Si. Un film mince (40) de PbTiO3 est déposé sur un pont (45) isolé thermiquement. Ledit pont (45) suspend le capteur PbTiO3 (40) au-dessus d'une cavité (70) obtenue de préférence par attaque de la tranche Si (10). L'isolation thermique améliorée augmente la sensibilité du capteur (33) à la radiation incidente. Le détecteur pyroélectrique (33) ainsi formé peut fonctionner efficacement à température ambiante.
Abstract:
Thermal radiation detection apparatus is provided comprising an array of pyroelectric detectors 1,2,3,4 in which compensation is provided for the effect of ambient temperature changes on the detector outputs and also for d.c. offsets which occur in source follower impedance converters 13 necessarily used with each detector. Single element detectors are used, the end pair of elements 3,4 being shielded from radiation and used as reference elements. Each element has a pair of diodes 11,12 connected in parallel in opposite sense to provide a d.c. path across the element. The reference element outputs are averaged 16,17,18 and fed via a high gain negative feedback loop 19 to the common connection 10 of all the elements. Offset voltages and element signals generated by ambient temperature changes are thereby compensated to the extent that the reference offsets and thermal voltages equal those of the active detector elements.
Abstract:
A version of the invention comprises a device for controlling or interfacing with a computer or other form of communicable machine based on the pyroelectric effect, and includes at least one optically- and infrared- (IR-) transparent graphene electrode.
Abstract:
A passive infrared sensor system (300) comprising: a direct current (DC) voltage source (302) supplying a DC voltage; a passive infrared sensor (304) supplied with the DC voltage, the passive infrared sensor comprising at least one sensor element; an alternating current (310) voltage source supplying an AC voltage, the AC voltage source arranged to induce an alternating current to flow through said at least one sensor element; an amplifier (306) arranged to amplify an output signal that is output from the passive infrared sensor to generate an amplified output signal (s1); and a filter (308) arranged to filter the amplified output signal to provide an output (312) of the passive infrared sensor system, wherein the filter is configured to filter a frequency of the AC voltage.
Abstract:
A detection circuit for a heat sensor includes a charge circuit (20) provided between a second power supply node (VDD) and a detection node (N1) of a heat sensing element (CF), a discharge circuit (30) provided between the detection node (N1) and a first power supply node (VSS), and a voltage detection circuit (50). The discharge circuit has a discharge resistance element (RA) and a discharge transistor (T2) provided in series between the detection node and the first power supply node.
Abstract:
An infrared detection circuit includes a charge transferring transistor, a gate control circuit and a negative potential generating circuit. The charge transferring transistor is disposed between a read node configured to be connected to one end of an infrared detection element and a tank node to transfer an electric charge from the infrared detection element to the tank node. The gate control circuit is connected to a gate of the charge transferring transistor. The negative potential generating circuit is connected to the tank node to set the tank node to a negative electric potential when the charge transferring transistor transfers the electric charge.