There are provided: a thermal history change type indicator by which the degree of reconstitution with hot water of instant cup noodles can be easily visually recognized in conjunction with the temperature in a container; and a set of a thermal history change type indicator and instant cup noodles comprising the thermal history change type indicator and instant cup noodles. The thermal history change type indicator comprises: a thermally meltable material layer containing a thermally meltable material; a permeation layer, wherein the permeation layer becomes transparent or translucent when the thermally meltable material melts and permeates the permeation layer; a thermally meltable material permeation-inhibiting layer for inhibiting the permeation of the thermally meltable material into the permeation layer, wherein the thermally meltable material permeation-inhibiting layer is arranged between the thermally meltable material layer and the permeation layer; and a protective layer, wherein the thermally meltable material layer, the permeation layer, and the thermally meltable material permeation-inhibiting layer are layered, and the permeation layer side of the layered product is covered with the protective layer. The set of a thermal history change type indicator and instant cup noodles comprises the thermal history change type indicator and instant cup noodles.

There are provided: a thermal history change type indicator by which the degree of reconstitution with hot water of instant cup noodles can be easily visually recognized in conjunction with the temperature in a container; and a set of a thermal history change type indicator and instant cup noodles comprising the thermal history change type indicator and instant cup noodles. The thermal history change type indicator comprises: a thermally meltable material layer containing a thermally meltable material; a permeation layer, wherein the permeation layer becomes transparent or translucent when the thermally meltable material melts and permeates the permeation layer; a thermally meltable material permeation-inhibiting layer for inhibiting the permeation of the thermally meltable material into the permeation layer, wherein the thermally meltable material permeation-inhibiting layer is arranged between the thermally meltable material layer and the permeation layer; and a protective layer, wherein the thermally meltable material layer, the permeation layer, and the thermally meltable material permeation-inhibiting layer are layered, and the permeation layer side of the layered product is covered with the protective layer. The set of a thermal history change type indicator and instant cup noodles comprises the thermal history change type indicator and instant cup noodles.

A multifunctional thermal exposure indicator can provide immediate reversible indications of overtemperature as well as irreversible indications of excessive thermal loading. Additionally, the multifunctional thermal exposure indicator can provide semi-reversible indications of undertemperature thermal loading, such as exposure to temperatures below the freezing point of water.

A multifunctional thermal exposure indicator can provide immediate reversible indications of overtemperature as well as irreversible indications of excessive thermal loading. Additionally, the multifunctional thermal exposure indicator can provide semi-reversible indications of undertemperature thermal loading, such as exposure to temperatures below the freezing point of water.

A dual heat-freeze indicator and methods for making the same are disclosed. The dual heat-freeze exposure indicator includes a substrate, a low temperature indicator material provided in a first initial color state, a high temperature indicator material provided in a second initial color state, both supported by the substrate. The low temperature indicator material is configured to change from the first initial color state to a first exposed color state responsive to the indicator being exposed to a temperature below a low temperature threshold. The high temperature indicator material is configured to irreversibly change from the second initial color state to a second exposed color state responsive to the indicator being exposed to a temperature above a high temperature threshold. The low temperature indicator material returns from the exposed color state to the initial color state responsive to being exposed to a temperature above a reset temperature threshold.

A dual heat-freeze indicator and methods for making the same are disclosed. The dual heat-freeze exposure indicator includes a substrate, a low temperature indicator material provided in a first initial color state, a high temperature indicator material provided in a second initial color state, both supported by the substrate. The low temperature indicator material is configured to change from the first initial color state to a first exposed color state responsive to the indicator being exposed to a temperature below a low temperature threshold. The high temperature indicator material is configured to irreversibly change from the second initial color state to a second exposed color state responsive to the indicator being exposed to a temperature above a high temperature threshold. The low temperature indicator material returns from the exposed color state to the initial color state responsive to being exposed to a temperature above a reset temperature threshold.

An apparatus, system and method for a time temperature indicator (TTI) which is capable of providing a summary of the time and temperature history of a good to which it is coupled, optionally including with regard to providing an indication as to whether one or more temperature thresholds have been breached. According to other embodiments, the TTI specifically provides an indication as to whether a temperature threshold at or around the freeze point has been breached, optionally even without providing a time and temperature history.

An ultrasound generator having a signal generator; and to generate a pulsed drive signal from a modulating signal, the pulsed drive signal having at least a zero output level, a positive output level and a negative output level. The position and width of pulses are defined by at least first and second switching angles per half cycle of the modulating signal. In part of the range of the modulating signal one switching angle increases while the other switching angle decreases simultaneously such that the fundamental frequency of the pulsed drive signal increases or decreases with the modulating signal and such that a selected harmonic component of the generated pulsed drive signal is maintained below a first threshold. A transducer is arranged to generate ultrasound in response to the pulsed drive signal.

A sensor line, a measuring arrangement and a method detect a change in an ambient variable. The sensor line serves for detecting a change in an ambient variable, in particular the temperature. The sensor line has a first optical waveguide, a second optical waveguide and also a material that changes its transparency depending on the value of the ambient variable. The material is positioned between the first optical waveguide and the second optical waveguide in such a way that light from the first optical waveguide is able to be coupled into the second optical waveguide in an event of a change in the transparency.

A sensor line, a measuring arrangement and a method detect a change in an ambient variable. The sensor line serves for detecting a change in an ambient variable, in particular the temperature. The sensor line has a first optical waveguide, a second optical waveguide and also a material that changes its transparency depending on the value of the ambient variable. The material is positioned between the first optical waveguide and the second optical waveguide in such a way that light from the first optical waveguide is able to be coupled into the second optical waveguide in an event of a change in the transparency.